MONOLITH 24457 12 Inch THX Subwoofer User Manual

Monolith THX® Subwoofer

P/Ns 24456, 24457, 24458, 35141, 35142, 35143, 38543
User’s Manual

SAFETY WARNINGS AND GUIDELINES

Please read this entire manual before using this device, paying extra attention to these safety warnings and guidelines. Please keep this manual in a safe place for future reference.

• This device is intended for indoor use only.
• Do not expose this device to water or moisture of any kind. Do not place drinks or other containers with moisture on or near the device. If moisture does get in or on the device, immediately unplug it from the power outlet and allow it to fully dry before reapplying power.
• Do not touch the device, the power cord, or any other connected cables with wet hands.
• If operating this subwoofer in a humid environment, ensure that no condensation occurs. Condensation could cause damage to the speaker cone and could cause a short in the subwoofer’s amplifier, which in turn could cause fire or severe electric shock.
• Do not subject the product to extreme force, shock, or fluctuations in temperature or humidity.
• Do not expose this device to excessively high temperatures. Do not place it in, on, or near heat sources, such as a fireplace, stove, radiator, etc. Do not leave it in direct sunlight.
• Do not place or install this device in an area where it can be exposed to excessive amounts of dust, humidity, oil, smoke, or combustible vapors.
• Prior to operation, check the unit and power cord for physical damage. Do not use if physical damage has occurred.
• Before plugging the unit into a power outlet, ensure that the outlet provides the same type and level of power required by the device.
• This device uses a grounded power cord and requires a ground connection for safe operation. Ensure that the power source has a proper ground connection. Do not modify the plug or use a “cheater’ plug to bypass the ground connection.
• Disconnect the unit from the power source when replacing the fuse. Replace the fuse only with the same type.
• Unplug this device from the power source when not in use.
• Take care to prevent damage to the power cord. Do not allow it to become crimped, pinched, walked on, or become tangled with other cords. Ensure that the power cord does not present a tripping hazard.
• Never unplug the unit by pulling on the power cord. Always grasp the connector head or adapter body.
• Ensure that power is turned off and disconnected before making any electrical connections.
• Clean using a soft, dry cloth only. Do not use chemical cleaners, solvents, or detergents. For stubborn deposits, moisten the cloth with warm water.
• This device has no user-serviceable parts. Do not attempt to open, service, or modify this device.

CUSTOMER SERVICE

The Monoprice” Customer Service department is dedicated to ensuring that your ordering, purchasing, and delivery experience is second to none. If you have any problem with your order, please give us an opportunity to make it right. You can contact a Monoprice Customer Service representative through the Live Chat link on our website www.monoprice.com or via email at support@monoprice.com. Check the website for support times and links.

PACKAGE CONTENTS

Please take an inventory of the package contents to ensure you have all the items listed below. If anything is missing or damaged, please contact MonopriceTM Customer Service for a replacement
lx MonolithTM subwoofer
lx AC power cable

PRODUCT OVERVIEW

CROSSOVER: Use the CROSSOVER knob to adjust the upper limit of the subwoofer’s frequency response from 40 to 160 Hz. The subwoofer will output only those frequencies below the set level. You should set the crossover frequency to obtain a smooth and seamless transition from the subwoofer to the main speakers in your system. If your main speakers are smaller units with limited low-frequency output, start with a higher frequency, such as in the 100-150 Hz range. With larger speakers that have greater low-frequency output, you might start with this control set lower, such as in the 60-100 Hz range.
PHASE: This control allows you to alter the phase of the subwoofer’s output signal from 0° – to 180° to correct for a possible mismatch in phase, which results in cancellation between the subwoofer and your main speakers. To adjust the PHASE, listen to the system with music playing and tune between 0° and 180° while listening for a change in mid-bass output. The correct position will have a higher amount of apparent mid-bass output.
LEVEL: This control allows you to adjust the output level of the subwoofer to match the main speakers in your system. We recommend starting with the LEVEL knob set to the THX position and then calibrating your system with your AV receiver, surround preamp/processor, or SPL meter. The THX position corresponds roughly to a 0dB setting.
For most home theater receivers and surround sound processors set the LEVEL knob to point straight upwards (in the 12 o’clock position). For music systems, start with the LEVEL knob at a low setting and increase it slowly from there until the audio level matches that of the main speakers. The use of test tones (from a receiver/processor’s built-in calibration function or test disc) and an SPL meter is suggested for proper level matching of all speakers.
CROSSOVER: Set this switch to the THX (OFF) position when using a modern audio/video receiver to bypass the subwoofer’s crossover settings. Use the ON setting to use the subwoofer’s built-in crossover, which is set using the CROSSOVER knob.
EQ: Set the EQ switch to the THX position to have the subwoofer perform within the THX®  certified parameters. When set to the EXTENDED position, the subwoofer will use your amplifier’s equalizer, with the result that the output level will be slightly louder, but with more distortion. Experiment to find which setting you prefer.
POWER: Use the POWER switch to determine whether the subwoofers will always remain on or if it will automatically go into standby mode after 30 minutes of no audio input.
LED INDICATOR : The LED will illuminate green when the subwoofer is powered on and will illuminate red when the subwoofer is in standby mode.
LFE & LINE UNBALANCED INPUTS: Use either of these RCA inputs to connect the LFE output on your amplifier or receiver. If your amplifier/receiver does not have an LFE output, connect the stereo preamplifier output on your amplifier/receiver to both thel and 2 inputs.
XLR BALANCED INPUT : Use this XLR input to connect to a balanced audio source.
XLR DIRECT PASS-THRU: This XLR output passes the original audio signal without modification of any kind.
FUSE/120 VAC: Plug the included AC power cord into the C14 panel connector on the combined AC input and fuse holder. The fuse holder includes both the main fuse and a replacement fuse. If you need an additional fuse, use the type indicated on the rear panel.

SETUP GUIDE

To get the maximum performance from your new MonolithTM THX® Subwoofer, it must be properly connected, positioned properly within the room, and configured to match your main speakers. To connect the subwoofer you will need either a single mono RCA audio cable (in the case of systems with a subwoofer/LFE output), a stereo RCA audio cable (in the case of systems with a left/right pre-amp output), or an XLR cable (when connecting from a receiver or processor with a balanced subwoofer output jack). Note that once an input signal is detected on the RCA or XLR input, the subwoofer will select that signal source and will disable the other source. To change the input from RCA to XLR or vice versa, unplug the subwoofer from the power outlet.
Subwoofer Placement
In most rooms, the optimum location for your subwoofer is in the closest solid front corner or somewhere along the front wall in line with your front speakers. This location typically offers optimal energy coupling with the room, front speakers, and the deepest low-frequency extension, with the best high-impact bass. Try to avoid a location that is far away from walls or near the center of your room. Bass output is maximized when the subwoofer is tucked into a corner. An ideal corner is far from wall divisions and has at least 6 feet or more of the wall to either side. Try to keep the subwoofer placement away from any large openings in other rooms. When corner loading a subwoofer, you might want to experiment with how close the subwoofer sits to the closest wall, with a general rule of thumb that it should be within 1 foot. Placing the subwoofer in close proximity to the seating position, for example, right next to or behind the sofa, maximizes the output and can reduce room effects on the subwoofer. A great technique for determining the best placement for your subwoofer is known as the Subwoofer Crawl. The first step is to place the subwoofer at your listening position. Ensure that audio with constant bass content or a test tone is playing. Next, crawl around the room (after all, the subwoofer will not be 5 feet in the air) and listen for where the bass sounds most full and has a definition, punch, and depth. This will generally be the best location in your room. Finally, place the subwoofer in that location and finish the rest of the setup and configuration.

Connecting to a Subwoofer/LFE Output
If your amplifier has a Subwoofer or LFE output, you can connect to the subwoofer using a single, mono RCA cable. Perform the following steps to connect the subwoofer to a dedicated subwoofer or LFE output on your receiver or amplifier. Note that any receiver that can decode Dolby DigitalTM or DTS0 soundtracks will have a dedicated subwoofer or LFE output.

1. Power off and unplug all equipment to be connected.

2. Using a single, mono RCA cable, plug one end into one of the LFE & LINE UNBALANCED INPUTS on the subwoofer, then plug the other end into the dedicated subwoofer or LFE output on your receiver.

3. (Optional) Using an XLR cable, plug one end into the XLR BALANCED INPUT on another Monolith’m subwoofer, then plug the other end into the XLR DIRECT PASS-THRU jack on the subwoofer.

4. Plug one end of the included AC power cable into the FUSE/120 VAC connector on the subwoofer, then plug the other end into a nearby AC power outlet.
   Warning! Due to the power requirements of the Monolith”‘ subwoofer, do not connect to the accessory outlets on a receiver or processor. If using a power strip, ensure that it has rated to accommodate the sub woofer’s power requirements

5. Plugin and power on all connected equipment.

6. Set the POWER switch on the subwoofer to the AUTO ON/OFF or ALWAYS ON position, as desired.

7. Using the information in the PRODUCT OVERVIEWsection, set the controls to the desired starting positions, then adjust as needed.

Connecting to a Stereo Preamp Output
The least desirable connection type is to connect to the stereo preamplifier output on an amplifier or receiver. Perform the following steps to connect the subwoofer to a stereo preamp output.

1. Power off and unplug all equipment to be connected.

2. Using a stereo RCA cable, plug the connectors on one end into both LFE & LINE UNBALANCED INPUTS on the subwoofer, then plug the other end into the stereo preamp outputs on your amplifier or receiver. Because the subwoofer is monophonic, there is no need to match left and right channels.
   Note: If you are using an external power amplifier and your preamplifier has only a single preamp output, use RCA Y-cables on each output to allow both the power amplifier and the subwoofer to be connected to the single output

3. (Optional) Using an XLR cable, plug one end into the XLR BALANCED INPUT on another MonolithIm subwoofer, then plug the other end into the XLR DIRECT PASS-THRU jack on the subwoofer. Repeat as often as desired.

4. Plug one end of the included AC power cable into the FUSE/120 VAC connector on the subwoofer, then plug the other end into a nearby AC power outlet. Warning! Due to the power requirements of the Monolith”’. subwoofer, do not connect to the accessory outlets on a receiver or processor. If using a power strip, ensure that it has rated to accommodate the subwoofer’s power requirements.

5.  Plugin and power on all connected equipment

6. Set the POWER switch on the subwoofer to the AUTO OWOFF or ALWAYS ON position, as desired.

7. Using the information in the PRODUCT OVERVIEW section, set the controls to the desired starting positions, then adjust as needed.

TROUBLESHOOTING

If there is excessive noise/hum when using the RCA input, there are some simple remedies:

1. Use a balanced XLR connection.
2. Reduce the gain of the subwoofer level by approximately 6dB, then increase the output level of the preamplifier/processor. This will improve the signal-to-noise ratio by approximately 6dB.
3. Use an RCA Y-adapter to utilize both RCA inputs, then reduce the gain by approximately 6dB, thereby improving the signal-to-noise ratio by approximately 6d B.

TECHNICAL SUPPORT

Monopricew is pleased to provide free, live, online technical support to assist you with any questions you may have about installation, setup, troubleshooting, or product recommendations. If you ever need assistance with your new product, please come online to talk to one of our friendly and knowledgeable Tech Support Associates. Technical support is available through the online chat button on our website www.monoprice.com during regular business hours, 7 days a week. You can also get assistance through email by sending a message to tech@monoprice.com

SPECIFICATIONS

aluminum bobbin
Surround| FEA optimized NBR (nitrite butadiene rubber)
Motor| FEA optimized, 2 aluminum shorting rings, undercut T-pole focused field
Magnet| Ceramic Y35, 2 pcs total 144 oz.
Xmax| 18mm (one-way)
Xmech| 78mm (peak-to-peak)
Enclosure| Sealed or vented HDF cabinet with horizontal and vertical bracing
Finish| Black Ash
Amplifier| Class D 500W,,
Frequency Response (-6dB)| Sealed| Vented
Extended EQ| 28-200Hz| 17-200Hz
THX0 EQ| 20-200Hz| 17-200Hz
Harmonic Distortion| <1% 20-100Hz (90dB @ 1m)
Variable Level Control| +15/-20dB
Crossover| Inline/Bypass variable 40-160Hz
Inputs| RCA (2), XLR
Outputs| XLR
Signal Turn On| Selectable always-on/auto
Auto Turn Off| 30 minutes
---|---
Dimensions (LxWxH)| 19.7′ x 15″ x 18.9″ (500 x 380 x 480 mm)
Weight| 72.5 lbs. (32.9 kg)
Model| 24457
---|---
Woofer| 12″ cone
Cone Material| 2 layer long fiber pulp/glass fiber cone
Voice Coil| 60mm with high temperature aluminum wire and black anodized aluminum bobbin
Surround| FEA optimized NBR (nitrite butadiene rubber)
Motor| FEA optimized, 2 aluminum shorting rings, undercut T-pole focused field
Magnet| Ceramic Y35, 2 pcs total 144 oz.
Xmax| 18mm (one-way)
Xmech| 80mm (peak-to-peak)
Enclosure| Sealed or vented HDF cabinet with horizontal and vertical bracing
Finish| Black Ash
Amplifier| Class D 500W „„
Frequency Response (-6dB)| Sealed| Vented (1 port)| Vented (2 ports)
Extended EQ| 26-200Hz| 19-200Hz| 18-200Hz
THX0 EQ| 29-200Hz| 23-200Hz| 20-200Hz
Harmonic Distortion| <1% 20-100Hz (90dB @ 1m)
Variable Level Control| 1-151-20dB
Crossover| Inline/Bypass variable 40-160Hz
---|---
Inputs| RCA (2), XLR
Outputs| XLR
Signal Turn On| Selectable always-on/auto
Auto Turn Off| 30 minutes
Dimensions (LxWxH)| 23.6″ x 16.7 x 22.8″ (600 x 425 x 580 mm)
Weight| 98.5 lbs. (44.7 kg)
Model| 24458
---|---
Woofer| 15″ cone
Cone Material| 2 layer long fiber pulp/glass fiber cone
Voice Coil| 60mm with high-temperature aluminum wire and black anodized aluminum bobbin
Surround| FEA optimized NBR (nitrite butadiene rubber)
Motor| FEA optimized, 2 aluminum shorting rings, undercut T-pole focused field
Magnet| Ceramic Y35, 2 pcs total 216 oz.
Xmax| 25mm (one-way)
Xmech| 90mm (peak-to-peak)
Enclosure| Sealed or vented HDF cabinet with horizontal and vertical bracing
Finish| Black Ash
Amplifier| 1000W,„
Frequency Response (-6dB)| Sealed| Vented (2 ports)| Vented (3 ports)
---|---|---|---
Extended EQ| 15-200Hz| 14-200Hz| 16-200Hz
THX0 EQ| 23-200Hz| 19-200Hz| 20-200Hz
Harmonic Distortion| <1% 20-100Hz (90dB @ lm)
Variable Level Control| +151-20dB
Crossover| Inline/Bypass variable 40-160Hz
Inputs| RCA (2), XLR
Outputs| XLR
Signal Turn On| Selectable always-on/auto
Auto Turn Off| 30 minutes
Dimensions (LxWxH)| 27.6″ x 17.7 x 26.8″ (700 x 450 x 680 mm)
Weight| 128.5 lbs. (58.3 kg)
Model| 35141
---|---
Woofer| 15″ cone
Cone Material| 2 layer long fiber pulp/glass fiber cone
Voice Coil| 60mm with high-temperature aluminum wire and black anodized aluminum bobbin
Surround| FEA optimized NBR (nitrile butadiene rubber)
Motor| FEA optimized, 2 aluminum shorting rings, undercut T-pole focused field
Magnet| Ceramic Y35, 3 pcs total 216 oz.
Xmax| 25mm (one-way)
Xmech| 90mm (peak-to-peak)
Enclosure| Sealed HDF cabinet with horizontal bracing
---|---
Finish| Black Ash PVC
Amplifier| Clarity DSP1000 1000W,„„ with DSP control
Frequency Response (-6dB)| Sealed
Extended EQ| 16-200Hz
THX0 EQ| 20-200Hz
Harmonic Distortion| <3% 20-100Hz (90dB @ 1m)
Variable Level Control| +15/-20dB
REF Level (100mV@40Hz)| 89dB @ lm
Crossover| Inline/Bypass variable 40-160Hz
Variable Phase| 0-180°
Inputs| RCA (2), XLR
Outputs (direct passthrough)| XLR
Signal Turn On| Selectable always-on/auto
Auto Turn Off| 30 minutes
Dimensions (without grille) (LxWxH)| 19.7′ x 16.7″ x 23.5′ (500 x 425 x 596 mm)
Dimensions (with grille) (LxWxH)| 21.0′ x 16.7′ x 23.5″ (533 x 425 x 596 mm)
Weight| 82.0 lbs. (37.2 kg)
Model| 35142
---|---
Woofer| 12″ cone
Cone Material| 2 layer long fiber pulp/glass fiber cone
Voice Coil| 60mm with high-temperature aluminum wire and black anodized aluminum bobbin
Surround| FEA optimized NBR (nitrite butadiene rubber)
---|---
Motor| FEA optimized, 2 aluminum shorting rings, undercut T-pole focused field
Magnet| Ceramic Y35, 2 pcs total 144 oz.
Xmax| 18mm (one-way)
Xmech| 80mm (peak-to-peak)
Enclosure| Sealed HDF cabinet with horizontal bracing
Finish| Black Ash PVC
Amplifier| Clarity DSP500 500Kr—with DSP control
Frequency Response (-6dB)| Seated
Extended EQ| 18-200Hz
THX0 EQ| 20-200Hz
Harmonic Distortion| <3% 20-100Hz (90dB @ 1m)
Variable Level Control| 1-151-20dB
REF Level (100mV@40Hz)| 86dB @1m
Crossover| Inline/Bypass variable 40-160Hz
Outputs (direct passthrough)| 0-180°
Inputs| RCA (2), XLR
Outputs| XLR
Signal Turn On| Selectable always-on/auto
Auto Turn Off| 30 minutes
Dimensions (without grille) (LxWxH)| 16.7″ x 15.4″ x 19.7″ (425 x 390 x 500 mm)
Dimensions (with grille) (LxWxH)| 18.4″ x 15.4′ x 19.T (468 x 390 x 500 mm)
Weight| 62.4 lbs. (28.3 kg)
Model| 35143
---|---
Woofer| 10′ cone
Cone Material| 2 layer long fiber pulp/glass fiber cone
Voice Coil| 60mm with high-temperature aluminum wire and black anodized aluminum bobbin
Surround| FEA optimized NBR (nitrite butadiene rubber)
Motor| FEA optimized, 2 aluminum shorting rings, undercut T-pole focused field
Magnet| Ceramic Y35, 2 pcs total 125 oz.
Xmax| 18mm (one-way)
Xmech| 78mm (peak-to-peak)
Enclosure| Sealed HDF cabinet with horizontal bracing
Finish| Black Ash PVC
Amplifier| Clarity DSP500 500W,..with DSP control
Frequency Response (-6dB)| Sealed
Extended EQ| 28-200Hz
THX0 EQ| 20-200Hz
Harmonic Distortion| <3% 20-100Hz (86dB @ 1m)
Variable Level Control| +15/-20dB
REF Level (100mV@40Hz)| 86dB @ 1m
Crossover| Inline/Bypass variable 40-160Hz
Inputs| RCA (2), XLR
Outputs (direct passthrough)| XLR
Signal Turn On| Selectable always-on/auto
Auto Turn Off| 30 minutes
Dimensions (without grille) (LxWxH)| 15.2′ x 12.6′ x 16.3″ (385 x 320 x 415 mm)
---|---
Dimensions (with grille) (LxWxH)| 20.8″ x 12.6″ x 16.3′ (528 x 320 x 415 mm)
Weight| 50.3 lbs. (22.8 kg)
Model| 38543
---|---
Woofer| 2x 15″ cone
Cone Material| 2 layer long fiber pulp/glass fiber cone
Voice Coil| 60mm with high-temperature aluminum wire and black anodized aluminum bobbin
Surround| FEA optimized NBR (nitrite butadiene rubber)
Motor| FEA optimized, 2 aluminum shorting rings, undercut T-pole focused field
Magnet| Ceramic Y35, 2 pcs total 216 oz.
Xmax| 25mm (one-way)
Xmech| 90mm (peak-to-peak)
Enclosure| Sealed or vented HDF cabinet with horizontal and vertical bracing
Finish| Black Ash
Amplifier| 2000 watts (RMS)/3600 watts (peak)
Frequency Response| 14-200Hz
Harmonic Distortion| <3% 20-100Hz (94dB @ 1m)
Variable Level Control| +151-20dB
Crossover| Inline/Bypass variable 40-160Hz
Inputs| RCA (2), XLR
Outputs| XLR
---|---
Signal Turn On| Selectable always-on/auto
Auto Turn Off| 30 minutes
Dimensions (LxWxH)| 27.6″ x 20.0″ x 42.3″ (700 x 508 x 1075 mm)
Weight| 216 lbs. (98 kg)

REGULATORY COMPLIANCE

Notice for FCC
This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Modifying the equipment without authorization from Monoprice may result in the equipment no longer complying with FCC requirements for Class B digital devices. In that event, your right to use the equipment may be limited by FCC regulations, and you may be required to correct any interference to radio or television communications at your own expense.
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the

user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and receiver.

• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

• Consult the dealer or an experienced radio/TV technician for help.
  Notice for Industry Canada
  This Class B digital apparatus complies with Canadian ICES-003. Cet appareil numdrique de la classe B est conforme a la norme NMB-003 du Canada.
  EU Declaration of Conformity
  Monoprice, Inc. declares the product described within this user guide or manual is in compliance with the below applicable directives. The full text of the EU Declaration of Conformity is available at the following internet addresses:
  https://www.monoorice.com/product?oid=24456
  httos://www.monoprice.com/product?oid=24457
  https://www.monoorice.com/product?oid=24458
  httos://www.monoprice.com/product?oid=35141
  httos://www.monomice.com/oroductThid=35142
  httos://www.monoprice.com/product?oid=35143
  httos://www.monoprice.comThroductn)id=38543
  or the CE DoC can be found within this user manual

• EMC Directive 2004/108/EC

• Low Voltage Directive 2014/35/EU

• RoHS2 Directive 2011/65/EU

• WEEE Directive 2012/19/EC

• Packaging & Packaging Waste Directive 94/62/EC

• REACH Directive 1907/2006/EC

WEEE Information

User information for consumer products covered by EU Directive 2012/19/EU on Waste Electric and Electronic Equipment (WEEE)
This document contains important information for users with regards to the proper disposal and recycling of Monoprice’m products. Consumers are required to comply with this notice for all electronic products bearing the following symbol:

For Consumers in the European Union: This EU Directive requires that the product bearing this symbol and or its packaging must not be disposed of with unsorted municipal waste. The symbol indicates that this product should be disposed of separately from regular household waste streams. It is your responsibility to dispose of this and other electrical and electronics products via designated collection facilities appointed by the government or local authorities. Correct disposal and recycling will help prevent potential negative consequences to the environment and human health. For more detailed information about the disposal of your unwanted product, please contacts your local authorities, waste disposal service, or the shop where you purchased the product

Safety Notice

WARNING: Do not use this product near water, for example, in a wet basement or near the swimming pool or in an area where accidental contact with water or liquid might occurs
WARNING: Avoid using this product during an electrical storm. There may be a remote risk of electric shock from the surge caused by lightning
WARNING: The external power adapter or AC power cord is the equipment disconnection device. The power outlet must be located nearby the equipment and its access must be easy
WARNING: Use this product in a well-ventilated area

Monogr/ce’TM, Monolith'”; the Monolith logo, and all Monoprice logos are trademarks of Monoprice Inc THXd ‘and the THX logo are trademarks of THX Ltd., registered in the U.S. and other countries
Dolby” Dolby”Digitalt Dolby Audio”‘ and the double-D symbol are trademarks of Dolby Laboratories.
DIV’ the Symbol, and DT5 and the Symbol together are registered trademarks of 015, Inc

References

• Monolith by Monoprice 10in THX Select Certified Subwoofer Amplifier - Monoprice.com
• Monolith by Monoprice 12in THX Ultra Certified 500-Watt Subwoofer Amplifier - Monoprice.com
• Monolith by Monoprice 15in THX Certified Ultra 1000-Watt Subwoofer Amplifier - Monoprice.com
• Products no longer Available HomePage
• Products no longer Available HomePage
• Products no longer Available HomePage
• Monolith by Monoprice M-215 Dual 15in THX Certified Ultra 2000-Watt Powered Subwoofer - Monoprice.com

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