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Gotham 

g213

PLACING YOUR GOTHAM IN YOUR LISTENING ROOM:

Your listening room or theater is an integral part of your sound reproduction 

system. Th

  e physical dimensions of the room and its furnishings, materials, doors 

and windows play an important role in defi ning how your system sounds. 

When you place a sound source in an enclosed rectangular space, “standing 

waves” are created, resulting from the relationship between the sound’s 
wavelength and your room’s dimensions. In other words, standing waves result 
from sound energy that is trapped in the room as it bounces back and forth 
between opposing walls. Standing waves in the room create acoustic peaks and 
dips where the sound is either louder or soft er, based solely on your physical 
position in the room. Energy also “builds up” at the room’s boundaries, creating 
exaggerated bass response at certain frequencies. Th

  ese fundamental room 

resonances are called room “modes.”

 Th

  e moral of this mode story is to try and avoid seating positions in standing 

wave peak or dip regions. It is highly recommended that you place your listening 
chairs in areas where modal peaks and dips are moderate and do not reinforce 
one another. Th

  e two most obvious areas to avoid are those near the exact center 

of the room and those close to any of the room’s walls. 

Just as your listening seat can be in a peak or dip region, so can your 

subwoofer. When placed in a room corner, a subwoofer maximally excites the 
room’s mode structure, creating the strongest output with the fewest dips. When 
the subwoofer is pulled away from a corner or wall, the room modes are excited 
less, which can alter the sound at your listening seat. 

Be sure to experiment with both your listening seat position and subwoofer 

position to fi nd the best solution. Careful experimentation usually leads to a 
superior sounding system. Use our setup suggestions (illustrated on the opposing 
page and the following pages) to get you started. 

If you cannot avoid placing your sofa against the back wall or your 

subwoofer in a less than optimal position, all is not lost. Your Gotham’s 
Automatic Room Optimization (A.R.O.) System can dramatically improve 
these less-than-ideal situations. 

We recommend that you begin by placing your Gotham in the front of the 

room, near the front left  or right speaker.

 Placing it directly in the front corner 

of the room will produce the maximum number of peaks and the minimum 
number of dips in the bass response. Th

  is can be advantageous because the 

Gotham’s A.R.O. system can correct the primary peak very eff ectively, whereas 
dips in response cannot be corrected via equalization. Dips in response can only 
be minimized via careful subwoofer and listener placement.

Placing the Gotham near solid walls will reinforce bass response and pulling 

it away from solid walls will decrease bass. Increasing the distance between the 
subwoofer and the walls may help to smooth upper bass response in some rooms.

We recommend that you avoid placing the Gotham near windows to prevent 

rattling and sound transmission to the outside world.

SPECIAL CONSIDERATIONS FOR HANDLING THE GOTHAM

Th

  e Gotham is extremely heavy and can be diffi

  cult to handle. Failure to 

handle it correctly during unpacking and placement can result in expensive 
damage which is not covered under warranty.

 

Summary of Contents for Gotham g213

Page 1: ...g213 Owner s Manual...

Page 2: ...urces such as radiators heat registers stoves fireplaces or other devices which produce heat Do not place candles on top of or near the subwoofer 10 Power sources The subwoofer should only be connecte...

Page 3: ...fallen or liquid has been spilled into the subwoofer c the subwoofer has been exposed to rain d the subwoofer does not appear to operate normally or exhibits a marked change in performance e the subwo...

Page 4: ...d signal processing technologies specifically aimed at delivering exceptional low frequency performance Your Gotham combines these core disciplines within a beautifully crafted package to deliver an u...

Page 5: ...employing patented feedback technology was created This advanced design is capable of unclipped output voltage equivalent to 3800 watts of RMS power when referenced to the nominal loudspeaker impedanc...

Page 6: ...MAY RESULT IN PRODUCT DAMAGE AND OR INJURY WARNING FAILURE TO HANDLE A GOTHAM CORRECTLY DURING UNPACKING AND PLACEMENT CAN RESULT IN EXPENSIVE DAMAGE WHICH IS NOT COVERED UNDER WARRANTY IMPORTANT YOU...

Page 7: ...d away from a corner or wall the room modes are excited less which can alter the sound at your listening seat Be sure to experiment with both your listening seat position and subwoofer position to fin...

Page 8: ...R COMPROMISED SEATING POSITIONS Results in weaker uneven bass performance BEST SEATING POSITIONS Most accurate bass performance COMPROMISED SEATING POSITIONS More intense but less accurate bass perfo...

Page 9: ...m at diagonally opposite corners of the room or at the center points of opposing walls as shown at right Experimentation with subwoofer and listener placement is recommended to achieve the best result...

Page 10: ...listening area can be achieved using four subwoofers placing one at the midpoint of each of the four walls although using two or three subwoofers can be almost as good Experimentation with subwoofer...

Page 11: ...remove the rear split foam insert and place in the carton 12 Tilt the subwoofer in the opposite direction towards its silver heatsink to remove the remaining split foam insert and place in the carton...

Page 12: ...ts the front control panel of a Gotham subwoofer A R O page 14 15 Power page 14 Input Mode page 15 Level Mode page 15 Master Level page 16 Lights page 16 LP Filter page 16 LP freq Hz page 16 e l f tri...

Page 13: ...trols and Connectors The labeled Figure below depicts the rear panel of a Gotham subwoofer Balanced Inputs page 18 Unbalanced Inputs page 19 IEC Style AC Connector page 21 Output to Slave Connector pa...

Page 14: ...e theater at the main listening seat greatly improving the in room low frequency response Calibration of the A R O system is fully automated and takes only a few minutes to accomplish Please consult t...

Page 15: ...the center of the Calibrate button will light and remain illuminated These settings are stored by the Gotham and will remain in memory even if power is disconnected During the ARO test sequence the C...

Page 16: ...the signal path 12 dB sets the roll off slope of the low pass filter to a 12 dB per octave slope Butterworth alignment 24 dB sets the roll off slope of the low pass filter to a 24 dB per octave slope...

Page 17: ...h is immediate it compliments the operation of the Phase control and cannot be replaced by it When placing your Gotham in the room experiment with the Polarity switch before adjusting the Phase contro...

Page 18: ...processors Separate left and right input jacks are provided for systems without a dedicated mono subwoofer connection This typically applies to two channel audio equipment Appropriate balanced cables...

Page 19: ...odern multi channel receivers and preamplifier processors Separate left and right RCA type input jacks are provided for systems without a dedicated mono subwoofer connection This typically applies to...

Page 20: ...osition and you need not concern yourself with this section any further If your installation incorporates two or more Gothams you will designate one Gotham as the Master and all others in the system a...

Page 21: ...rries any signal processing selected on the Master Gotham including the Master Level setting and A R O processing to further Gothams operating in Slave mode From Gothams operating in Slave mode the Ou...

Page 22: ...type connector Balanced connections provide superior noise rejection and ensure proper grounding between components If your receiver or processor has balanced outputs we highly recommend that you use...

Page 23: ...s balanced outputs we highly recommend that you use them to connect to the Gotham designated as the master In the connection diagram at left balanced connections are shown as solid lines unbalanced co...

Page 24: ...comfortable running your main speakers full range you can split your preamplifier s output signals using appropriate Y connectors in place of the active crossover shown in the diagram Two connection...

Page 25: ...nnection types are available for connecting the Gothams to your two channel audio system balanced XLR or 1 4 inch TRS connector and unbalanced RCA type connector Balanced connections provide superior...

Page 26: ...speaker setup menu properly set all speaker distances to the primary listening seat including the subwoofer s distance Use a tape measure to determine these distances time coherence is important If mu...

Page 27: ...connected directly to your receiver or preamp processor is indicating Master on its Input Mode lights and that all other units are indicating Slave on their Input Mode lights If not you will need to a...

Page 28: ...ons on page 29 of this manual 2 Polarity and Phase Adjustment It is often helpful to have a second person operating these controls so that you can easily hear the changes from the primary listening se...

Page 29: ...emove the calibration microphone from its protective pouch and connect its cable to the mini XLR jack on the Gotham s front control panel NOTE A R O Calibration is only possible when the included JL A...

Page 30: ...ntrols to their previously determined settings before the A R O calibration run and re tweak the subwoofer output level as described in Step 1 Level Setting on page 28 Since the A R O will smooth the...

Page 31: ...til these artifacts disappear Will my electric bill be high if I leave the Gotham in Auto mode When in Auto mode the Gotham amplifier is only powered up when a significant signal is detected on the in...

Page 32: ...We recommend Nanowax because in our testing it has performed best in creating a lustrous swirl free result This product can be ordered online at www eagleone com or purchased wherever detailing suppli...

Page 33: ...fy the position of the E L F Trim knob Hums or other unusual noises from your Gotham 1 See Input Mode discussion on page 20 of this manual especially if any upstream components cables etc have recentl...

Page 34: ...Gotham g213 Page 34...

Page 35: ...ective product with new or remanufactured product at no charge Any applicable implied warranties are limited in duration to the period of the express warranty as provided herein beginning with the dat...

Page 36: ...On or Automatic Signal Sensing Light Modes Off On or Dim Low Pass Filter Mode Off 12 dB per octave or 24 dB per octave Low Pass Filter Cutoff Frequency Variable from 30 Hz 130 Hz Polarity 0 or 180 de...

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