Revel Ultima Gem Loudspeakers ULTIMA GEM Owner’s Manual 2. Figure 1. ... any service-related...

Revel® Ultima™ Gem Loudspeakers

TABLE OF CONTENTSINTRODUCTION...............................................3

ABOUT THE MANUAL AND WARRANTY.................................3

DESCRIPTION .................................................4WOOFERS ........................................................................4TWEETERS........................................................................5CROSSOVER NETWORK .....................................................5CABINET...........................................................................5

UNPACKING....................................................6INSTALLING STANDS (OPTIONAL) .....................7PLACEMENT ...................................................9

ROOM ACOUSTICS...........................................................11ROOM TREATMENT..........................................................12

CONNECTIONS..............................................13SINGLE-WIRED SYSTEM CONNECTIONS ............................13BI-WIRED SYSTEM CONNECTIONS ....................................14BI-AMPLIFIED SYSTEM CONNECTIONS...............................15

SYSTEM OPTIMIZATION..................................17CABINET CARE..............................................18LOUDSPEAKERS AND POWER........................18OBTAINING SERVICE......................................19SPECIFICATIONS............................................20

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Figure 1. The REVELULTIMA GEM loudspeaker.

INTRODUCTIONWith its striking and sophisticated appearance, the REVEL® ULTIMA™

GEM loudspeaker hints at its advanced design from the first glance.The simple and clean lines characterize an exceptional sound repro-duction system defined by its custom-designed drivers, individuallyoptimized crossover network, and a highly-functional enclosure.

We created these loudspeakers to achieve superior performance in the widest possible range of environments. Physically small enough to be used in modest rooms, they are dynamic enough to be used invery large rooms. They are equally at home in discriminating two-channel systems, as well as multi-channel and home theater systems.Moreover, we’ve taken the care to make them as adaptable as possibleto a variety of room positions and the acoustical interactions typicallyfound in homes.

ABOUT THE MANUAL AND WARRANTYTo begin enjoying your new loudspeakers, first read and then performthe instructions in this owner’s manual. Maximum performancedepends on following all instructions described here, as well as thosefound in the owner’s manuals of associated components in your audiosystem. Save these instructions for future reference.

REVEL ULTIMA GEM loudspeakers are covered by a limited 5-yearwarranty, so save the bill of sale to protect your purchase and aid inany service-related questions.

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Figure 2. The REVEL ULTIMA GEM transducer andconnection locations.

DESCRIPTIONThe REVEL ULTIMA GEM loudspeaker features a unique trans-ducer configuration (see Figure 2) to create an acoustic center thatis halfway between the two woofers and coincident with the fronttweeter’s acoustic center. A second tweeter (on rear of cabinet),operating above 8 kHz, provides additional high-frequency energyto enhance overall “room response.”

Combined with an individually-optimized crossover network, thistransducer arrangement provides a uniform vertical “listening win-dow” or area in which the sound varies little. Also, the smallwoofer size and compact baffle width help to create an extremelywide horizontal window in which optimum sound can be heard.

WOOFERSTo ensure uncompressed dynamic range, each loudspeaker containsa pair of 5-inch woofers that are unique in the following ways:

• The woofer’s radiating surface is made of titanium for true pis-tonic behavior to over 4 kHz, well beyond its function in theGEM system.

• Optimized magnetic circuits to minimize harmonic distortion.

• The woofer’s motor system utilizes neodymium magnets with astray-flux containment system for shielding near video monitors.

• Oversized 2-inch diameter voice coils with flat aluminum wireoffer higher power handling than average-sized coils for greateraccuracy at high volume levels and during extended crescendos.

• The cast magnesium frame provides optimum voice coil coolingand minimum reflections, while offering excellent rigidity.

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High Frequency Input

High Frequency Level(dB)

-1

Front0 +.5-.5

+1

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Low Frequency Input

Serial No.

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RemoveStraps forBi-wired or

Bi-amplifiedOperation.

Front

Tweeter

Port

High-FrequencyLevel Controls

Connectors (withshorting straps)

Rear

Woofer

Tweeter

Woofer

NorthridgeCaliforniaMade in U.S.A.

TWEETERSEach loudspeaker also contains two high-performance tweeterswith the following features:

• Optimized tweeter-dome profiles for maximum dispersion,while eliminating coloration caused by “break-up modes.”

• Linear reproduction with very-low harmonic distortion even athigh output levels for uncompressed sound purity.

• The front tweeter utilizes a large voice-coil with an oversizedsurround roll. This provides for the higher power handling andlonger excursion capability required to reproduce greateruncompressed dynamics.

CROSSOVER NETWORKBuilt into each loudspeaker is an individually-optimized crossovernetwork with the following features:

• A 2-way, 24 dB per octave crossover at 2.7 kHz shapes the on-and off-axis response of each driver and the complete system.

• Hand-wired filter networks with air-core inductors and film capacitors are calibrated to match each loudspeaker tothe reference standard.

• Provision for bi-amplified and bi-wired applications via remov-able external shorting straps on the gold-plated binding posts.

• External level controls for both the front and rear tweeters viacalibrated switched precision resistors, thus maintaining identi-cal response from both speakers for ideal imaging.

CABINETThe cabinet offers groundbreaking appearance and aids in overallsystem performance. The inner enclosure is designed as an acousti-cally-inert platform for sound-wave generation. Integral side panelsprovide a custom look via available finishes and are internallydamped by sandwiched viscoelastic energy-absorbing layers toreduce any sound transmission effects.

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Figure 3. A REVEL ULTIMA GEM loudspeakerwith its inner packing materials.

UNPACKINGTo avoid injury, please use care during unpacking. Alwaysstand as straight as possible and use your leg muscles to lift aREVEL ULTIMA GEM loudspeaker. Do not lift it while bend-ing from the waist.

To unpack a REVEL ULTIMA GEM loudspeaker, perform thefollowing steps:

1. Place a REVEL ULTIMA GEM loudspeaker onto its side.

2. Open the bottom flaps. Stand the carton in the up position.

3. Lift the carton off the loudspeaker and set it aside, being carefulnot to damage the contents (see Figure 3).

4. Remove the allen wrench and set it aside.

5. Remove the left and right pads and the protective cloth. Usecaution to avoid scraping the finish or pulling off the grille.

After unpacking the unit, carefully inspect it for possible damagedue to shipping. If you discover any damage, immediately contactyour Revel dealer for further assistance. When moving a REVELULTIMA GEM loudspeaker (e.g., when experimenting with place-ment), avoid touching the transducers.

Keep all packing materials for future shipping. In the unlikelyevent a product will need repair, Revel will only accept a unit in itsoriginal shipping carton. Using any other packing materials mayresult in damage to the product and is not covered by the warranty.See Obtaining Service on page 19 for additional details.

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Allen Wrench

Left Pad

Right Pad

Warranty Card andOwner’s Manual

WARNING

Figure 4. Installing the baseonto the pedestal.

Figure 5. Installing spikes.

INSTALLING STANDS (OPTIONAL)1. Unpack all stand boxes. Place a pedestal, base, and top plate on

a soft surface (e.g, rug or soft cloth).

2. Using a Phillips screwdriver, install a base to a pedestal with fivelong screws, as shown in Figure 4.

3. Thread four spikes about halfway into the base and tighten eachone with a locking ring, as shown in Figure 5.

continued on next page...

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Pedestal

Base

(5) Long Screws(Start All ScrewsBefore Tightening)

(4) Spikes

(4) Covers*(optional for hardwood

or tile floors)

(Optional) Use Covers*For Hard Floors

(4) LockingRings

*NOTE: Apply a small bead of suppliedsilicone adhesive into each cover andfasten onto each spike. Wait 20 minutesfor silicone to set.

Figure 6. Installing the top plate.

Figure 7. Fastening the REVELULTIMA GEM loudspeaker tothe assembled stand.

INSTALLING STANDS (CONT’D)4. Place the stand in its upright position and install the top plate

with five short screws, as shown in Figure 6.

5. Fasten a loudspeaker to the stand with three short screws, asshown in Figure 7. Read the Placement section before makingfinal placement and spike adjustments. Repeat steps 1 through 5for the other stand.

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(5) Short Screws(Start All ScrewsBefore Tightening)

Top Plate

REVEL ULTIMA GEM

(3) Short Screws(Start All Screws

Before Tightening)

Figure 8. A REVEL ULTIMAGEM loudspeaker is placedon an optional stand for an

ideal match between tweeterand ear heights.

Figure 9. Typical placement ofREVEL ULTIMA GEM

loudspeakers for stereo.

NOTE: The suggested roomtreatments coincide with the

primary reflection points.

PLACEMENTSound quality is heavily dependent on the accuracy of your loudspeak-ers, their placement in the listening room, and the acoustics of theroom itself. Since the REVEL ULTIMA GEM loudspeakers areextremely accurate, experimenting with their placement is the mostsignificant way to optimize their performance in a given environment.The following guidelines will help you obtain the best results:

• In most situations, we recommend placing the REVELULTIMA GEM loudspeakers on their (optional) matchingstands, as shown in Figure 8.

NOTE: When experimenting with placement, we recommend thattwo people move a REVEL ULTIMA GEM loudspeaker (with itsattached stand) by lifting under the stand’s top plate.

• For best stereo imaging, place the REVEL ULTIMA GEMloudspeakers at equal distances from the main listening positionand in symmetry with the room, as shown in Figure 9.

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Listening Position(e.g., on couch)

Absorptive orDiffusive Material

Absorptive or Diffusive Material

Absorptive or Diffusive Material



R REVEL ULTIMA GEM

L REVEL ULTIMA GEM

GEM Tweeter

PLACEMENT (CONTINUED)• Optimum timbre and imaging precision is obtained with the

loudspeakers pointing almost directly toward the prime listen-ing position. Some listeners prefer a wider “soundstage,” whichis achieved by reducing the toe-in angle, perhaps to the point ofaiming the loudspeakers straight ahead.

• Imaging and a sense of spaciousness will improve as the loudspeakers are moved away from the wall behind the loud-speakers and the side walls.

NOTE: You may then need to move the listening position back tomaintain the best stereo image.

• For more bass reinforcement, try moving the loudspeakers closerto the front wall or corners (also see Room Acoustics on next page).

NOTE: You may then need to move the listening position forwardto maintain an acceptable stereo image.

• For best results, make sure there are no objects between theREVEL ULTIMA GEM loudspeakers and the intended listeningarea (e.g., a coffee table in front of the listener will degrade timbreand imaging). If possible, avoid placing the loudspeakers nearlarge objects, which can cause unwanted reflections.

• Ideally, the listening room should be acoustically neutral, nei-ther producing any distinct echoes nor sounding completely“dead” and lifeless (also see Room Treatment on page 12).

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ROOM ACOUSTICSListening rooms have a profound impact on sound quality, espe-cially at low frequencies. In fact, a listening room can actuallydominate the sound quality below about 300 Hz. Ideally, a newroom being built from scratch would include optimized dimen-sional ratios to minimize the effects of standing waves.

However, most installations will be made in existing rooms. Inthese cases, your only solution is to take special care in selectingboth the speaker and prime listening locations, which will pay offin superior low frequency performance. Often the differencebetween poor and excellent results is the result of relatively smalladjustments in speaker and listener placements.

The interaction of loudspeakers and rooms is quite complex, as theloudspeaker and listener are affected by two mechanisms. First,nearby surfaces, or boundaries, cause large peaks and dips in lowfrequency response. These peaks and dips can often range 12 dB ormore. Second, the loudspeaker and listener locations interact withthe standing waves, or room modes. These standing waves, or reso-nances, also result in large response errors. There are no simple for-mulas that take both mechanisms into account. Even computerprograms that analyze one or both factors still may not provideyou with the proper speaker or listener placement values.

Here’s where real-world experience counts. We suggest consultingyour Revel dealer for help in determining the optimum loudspeak-er and listener placement for your listening room.

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PLACEMENT (CONTINUED)ROOM TREATMENTREVEL ULTIMA GEM loudspeakers have very accurate off-axisresponse, which minimizes any degradation caused by overly “live”rooms. However, far superior performance will be achieved byplacing at least minimal acoustic treatment materials at the primaryreflection points. Ideally, special acoustic absorbers or diffusersshould be placed at the first reflection points on the side and frontwalls along with either absorbers or diffusers at the first reflectionpoints on the rear wall. Short of using acoustic treatment materials,even simple hanging rugs can be a great help in overly brightrooms. Carpeting the floor area between the speakers and listenerand placing irregular surfaces, such as bookcases, will also helpbreak up strong reflections.

Since our ears and eyes are located on the same plane, we can use amirror (also known as the “mirror method”) to accurately deter-mine the most important locations (the first reflection points) formaterial treatment, as follows:

1. After the loudspeakers are placed, the listener should sit in theprime listening position.

2. A second person should slide a mirror along the walls.

3. Note the locations at which the listener can see either of theloudspeakers. These will be the reflection points that wouldrequire acoustic treatment materials.

Using this method, find all treatment locations for side walls, frontwall, and rear wall with side walls taking priority. Where possible,also determine the treatment locations for first ceiling reflections.

Your Revel dealer can recommend acoustic treatment materials,and can help determine the best plan for your room. If it is a dedicated listening room, qualified room treatment manufacturersor even acousticians may be consulted for optimum results.Remember, properly treated rooms provide dramatically betterresults with any loudspeakers than untreated rooms.

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Figure 10. Wire gauge versusmaximum wire run (with amaximum loop resistance of

0.07 ohms) for less than 0.2 dBresponse error.

NOTE: “Loop resistance” is theDC resistance measured at one

end of a loudspeaker cable, withthe other ends shorted together.

CONNECTIONSREVEL ULTIMA GEM loudspeakers can be connected to an audiosystem in three different ways: single-wired, bi-wired or bi-amplified.Please read the following sections before proceeding with actual con-nections. Also, be sure to observe the following points:

• Use high-quality speaker cable with a maximum total loop resis-tance (for each wire run) of 0.07 ohms or less. Use the chart inFigure 10 below to determine the maximum wire gauge.

A high loop resistance will result in mis-termination of thefilter networks, and serious degradation of sound quality.Use high-quality connectors on the loudspeaker cables. Consultyour Revel dealer as to specific solutions for your application.

• Turn off all audio system power before making any connections.

• Read the owner’s manuals that were included with your audiocomponents to confirm their connection procedures.

• Verify correct polarities (i.e., + to + and − to −) when makingconnections. Failure to do so will cause poor imaging anddiminished bass response.

• For bi-wired or bi-amplified applications, remove the shortingstraps (see Figures 12, 13, and 14 on the next three pages).

SINGLE-WIRED SYSTEM CONNECTIONSFor most applications, simply leave the shorting straps in place andconnect the + and − from a single amplifier channel to the HIGHFREQUENCY INPUT terminals, as shown in Figure 11 (on thenext page).

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WIRE GAUGE (AWG) LENGTH (FEET) LENGTH (METERS)6 87 277 69 218 58 189 43 13

10 34 1011 27 812 22 713 17 514 14 415 11 316 9 317 7 218 5 2

IMPORTANT

Figure 11. How to connect the REVEL ULTIMA GEMloudspeaker in a single-wiredsystem, the most common typeof installation.

Figure 12. How to connect the REVEL ULTIMA GEM loudspeaker in a bi-wired system.

CONNECTIONSSINGLE-WIRED SYSTEM CONNECTIONS (CONT’D)

BI-WIRED SYSTEM CONNECTIONSA bi-wired system involves two pairs of speaker wires connected toa single amplifier channel. Remove the shorting straps and connectthe + and − of one pair of wires to the HIGH FREQUENCYINPUT terminals and the + and − of the other pair of wires to theLOW FREQUENCY INPUT terminals, as shown in Figure 12.Check with your Revel dealer for recommendations and possiblebenefits for your application.

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redwhite

redwhite

GEM Rear

ConnectorPanel



-1

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+1

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Shorting StrapsRemoved

Amplifier(rear)

(one channel shown)



-1

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+1-2

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Low Frequency Input

Serial No.


Shorting Straps(leave in place)

redwhite

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ConnectorPanel



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Amplifier(rear)

(one channel shown)



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Figure 13. How to connect the REVEL ULTIMA GEM

loudspeaker in a vertical bi-amplified system.

BI-AMPLIFIED SYSTEM CONNECTIONSA bi-amplified system provides increased sonic performance,since independent amplifier channels separately drive each set ofhigh- and low-frequency transducers. You can connect the loud-speakers in either a vertical or horizontal bi-amplified systemwithout requiring an additional electronic crossover.

VERTICAL BI-AMPLIFIED SYSTEM

Using two identical amplifier channels, remove the shorting strapsfrom the rear panel; then connect the loudspeakers as shown inFigure 13.

Failure to remove the shorting straps when bi-amplifying maydamage some amplifiers.

NOTE: When using two dissimilar amplifiers, connect the loudspeakersin a horizontal bi-amplified system (see the next section).

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redwhite

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GEM Rear

ConnectorPanel



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Amplifier(rear)

Ch. 1 Ch. 2

(one channel shown)

(one channel shown)

(Optional “Y” Adaptor)

INPUT INPUT

Pre-Amplifier(rear) OUTPUTOUTPUT



-1

Front0 +.5-.5

+1-2

Rear0 +40ff

Low Frequency Input

Serial No.


WARNING

Figure 14. How to connect the REVEL ULTIMA GEMloudspeaker in a horizontal bi-amplified system.

CONNECTIONSBI-AMPLIFIED SYSTEM CONNECTIONS (CONT’D)

HORIZONTAL BI-AMPLIFIED SYSTEM

Using two amplifier channels, remove the shorting straps from therear panel; then connect the loudspeakers as shown in Figure 14.

Failure to remove the shorting straps when bi-amplifying maydamage some amplifiers.

NOTE: If the “gain factor” of the two amplifier channels is not identi-cal, a means of adjusting the input level of at least one of the channelsis required. Consult your Revel dealer for specific recommendations.

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redwhite

redwhite

GEM Rear

ConnectorPanel


(one channel shown –use for high frequencies)

(one channel shown –use for low frequencies)

Amplifier(rear) INPUT

Amplifier(rear) INPUT



-1

Front0 +.5-.5

+1-2

Rear0 +40ff

Low Frequency Input

Serial No.




-1

Front0 +.5-.5

+1

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Rear0 +40ff

Low Frequency Input

Serial No.

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(one channel shown)

(Optional “Y” Adaptor)

Pre-Amplifier(rear) OUTPUTOUTPUT

WARNING

Figure 15. The REVELULTIMA GEM level controllocations and initial settings.

SYSTEM OPTIMIZATIONAfter connecting the REVEL ULTIMA GEM loudspeakers, initially set both HIGH FREQUENCY LEVEL controls on therear panel to the “0” position (see Figure 15).

1. Turn on the system power and play a favorite piece of music.Slowly increase the volume to a comfortable level and listenfrom your main listening position. Experiment with placement(see page 9), as it will pay off in optimized tonal balance, imagespecificity, and spaciousness.

2. You may also wish to further adjust the HIGH FREQUENCYLEVEL controls (see Figure 15) for both front and rear tweet-ers to achieve the most natural sound in your room. Varyingthe FRONT control will change the high frequency balanceand timbre. Varying the REAR control will mainly affect “air”and spaciousness.

NOTE: Be certain the corresponding controls are set the same onboth left and right channels.

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GEM Rear



-1

Front0 +.5-.5

+1

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Serial No.

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Low Frequency Input

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Set High-FrequencyLevel ControlsTo “0”

Connector Panel

CABINET CAREEach REVEL ULTIMA GEM loudspeaker cabinet has a paint fin-ish and does not require any routine maintenance. Use a soft cloth,dampened with water only, to remove any fingerprints or to wipeoff dust. Clean the grille by gentle vacuuming.

For wood side panels, occasionally use a household furniture polishto maintain the beauty of the hardwood veneers. For aluminumside panels, use a soft cloth, dampened with soapy water only.

SPEAKERS AND POWERREVEL ULTIMA GEM loudspeakers use high-order crossoverswith steep cut-offs to eliminate damage caused by “out of band”frequencies. Using this approach, in combination with carefullyselected components and transducers, gives us confidence that aREVEL ULTIMA GEM loudspeaker will not fail, even underextreme conditions.

However, there is a limit to how loud any speaker can play contin-uously. A good rule of thumb is to avoid playing the system at vol-ume levels beyond where the sound is “clear.” If the sound becomesdistorted or strained, reduce the volume level immediately toavoid damage.

If you are unsure of the suitability of current or planned amplifiercomponents, please ask your Revel dealer to review them beforeconnecting your REVEL ULTIMA GEM loudspeakers.

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OBTAINING SERVICEWe take great pride in our dealers. Experience, dedication, andintegrity make these professionals ideally suited to assist with ourcustomers’ service needs.

If your Revel component requires service, please contact your dealer.Your dealer will then decide whether the problem can be remediedlocally, or whether to contact Revel for further service information orparts, or to obtain a Return Authorization. If needed, call the RevelService Department at:

1-818-830-8777 on any business day, from 9 A.M. to 5 P.M. PST.

The Revel Technical Services Department works closely with yourdealer to solve your service needs expediently.

Return authorization must be obtained from Revel’s TechnicalServices Department BEFORE a unit is shipped for service.

It is extremely important that information about a problem beexplicit and complete. A specific, comprehensive description of theproblem helps your dealer and the Revel Technical ServicesDepartment locate and repair the difficulty as quickly as possible.

A copy of the original bill of sale will serve to verify warranty status.Please include it with the component when it is brought in for warranty service.

All returned units must be properly packaged in their originalpacking material, and the proper return authorization numbersmust be marked on the outer carton for identification. If thepackaging to protect the unit is, in our opinion or that of ourdealer, inadequate to protect the unit, we reserve the right torepackage it for return shipment at the owner’s expense. NeitherRevel nor your dealer can be responsible for shipping damagedue to improper (i.e., non-original) packaging.

Your dealer can order a new set of shipping materials for you if youneed to ship your component and no longer have the originalmaterials, or if they are in poor condition. There will be a chargefor this service. We strongly recommend saving all packing materi-als in case you need to ship your unit some day.

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IMPORTANT

WARNING

SPECIFICATIONSRevel utilizes proprietary measurement methods in the design andspecification of our loudspeakers. Our research has developed aseries of tests that represent a great leap forward in making mea-surements that dramatically contribute to our goal of accuratelyreproducing music or film.

Sensitivity: 87.0 dB SPL, with 2.83 Vrms @ 1 m (4 pi anechoic)

Sensitivity provides an indication of how much amplifier power is requiredfor the loudspeaker to play at satisfactory volume levels. This conservatively-rated specification indicates moderate sensitivity and denotes that theREVEL ULTIMA GEM loudspeaker does not require huge amplifiers toachieve realistic levels in all but the largest rooms.

Impedance: 6 ohms (nominal), 3 ohms (minimum) @ 115 Hz

Impedance indicates whether the speaker system presents a “hard” or “easy” load on the amplifier. A minimum impedance value of3 ohms, together with moderate phase angles, signifies that any competently-designed amplifier can easily drive the REVEL ULTIMAGEM loudspeaker.

Filters (Crossover): 2-way, 24 dB @ 2.7 kHz

The steep filter slopes ensure good acoustical behavior in thecrossover regions, with a minimum of acoustical interference, alongwith low distortion and wide dynamic range. The filters featurespecially selected components. Woofer and tweeter filter boards arephysically independent.

Frequency Responses: In-Room Response;±1.5 dB from 77 Hz to 18 kHz

In-room response is a breakthrough measurement that, in a singlecurve, closely correlates to sound quality and has been a goal of loud-speaker engineers for years. Research, and simple observation, revealsthat ubiquitous “on-axis” response curves often cannot distinguishbetween two loudspeakers with radically different sound quality. This REVEL ULTIMA GEM loudspeaker specification is even morepowerful when it is taken in context with the other measurementspresented here.

In-Room Response Relative to Target Response;±1.0 dB from 70 Hz to 20 kHz

A target response is the ideal response goal and is not flat at the fre-quency extremes and is used when the ideal reference is not a “flat”line. A target response must be tailored to the loudspeaker’s intendedapplication and takes into account the acoustic impact of the loud-speaker’s location, such as freestanding, or placement near a wall.

First-Reflections Response;±1.5 dB from 77 Hz to 16 kHz

First reflection response is a measure of the response a listenerhears that is contributed by the first reflections from the walls,floor, and ceiling. This superb specification indicates that REVELULTIMA GEM loudspeaker will remain accurate, even in the pres-ence of strong reflections.

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Figure 16. Overall dimensionsfor the REVEL ULTIMAGEM loudspeaker and its

optional stand.

SPECIFICATIONS (CONTINUED)Frequency Responses: Listening Window Response; (continued) ±1.0 dB from 85 Hz to 17 kHz

This improved “on-axis” measurement reduces the visual confusion of inaudible local interference, yet still retains full accuracy withoutusing “spectral smoothing” which results in significant data loss.

Low Frequency Extension;-3 dB @ 61 Hz (-6 dB @ 47 Hz, -10 dB @ 38 Hz)

Studies have shown that the -10 dB low frequency extension specifica-tion is the one that best correlates to controlled listening tests. At lowfrequencies, most loudspeaker/room combinations will exhibit signifi-cant “room gain”, which is an increasing rise in level as frequenciesdecrease. In addition, the -10 dB specification reflects the steepness (i.e., order) of the low-frequency roll-off, which is not significantly indicated in -3 dB specifications.

Dimensions: 19 1⁄ 2"H x 83⁄ 8" W x 17 3⁄8" D495 mm H x 213 mm W x 441 mm D(with side panels and grille – see Figure 16 below)

Weight: 44 lb (20 kg), wood panels, net weight59 lb (27 kg), aluminum panels, net weight

Revel, a division of Madrigal Audio Laboratories, constantly strives to update and improve existing products, as well as create new ones. Therefore, the specifications and construction details in this and related Revel publications are ubject to change without notice. Ultima is a trademark and Revel is a registered trademark of Harman InternationalIndustries, Inc. © Harman International, 2000.

REVEL ULTIMA GEM

Owner’s Manual

21

17-3 ⁄ 8"(440.9 mm)

8-3 ⁄ 8"(212.2 mm)

20"(508.0 mm)

19-1⁄ 2"(495.3 mm)

29-5 ⁄ 8"(752.5 mm)

49-1⁄8" (1,247.8 mm)

11-7⁄16"(290.4 mm)

28-1⁄ 8"(714.4 mm

27"(685.8 mm)

3 ⁄16"(4.8 mm)

15 ⁄16"(23.9 mm)

1-1 ⁄ 2"(38.1 mm)

P/N 9301574-001

8500 BALBOA BOULEVARD

NORTHRIDGE, CA 91329

PH: (818) 830-8777 • FAX: (818) 892-4960www.revelspeakers.com

Revel Ultima Gem Loudspeakers ULTIMA GEM Owner’s Manual 2. Figure 1. ... any service-related...

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