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350W Subwoofer Amplifier 

From 

Rythmik Audio    

www.rythmikaudio.com

Thanks for purchasing this 350W Subwoofer Amplifier.  The
amplifier is designed for home theater application. It features an
extension (or rumble) filter that can be used to correct the bass roll-
off of the subwoofer and/or to adjust for room response in the bass
band. In addition, the amplifier is packed with other standard
features such as both speaker level and line level inputs, high-pass
line outputs (12db/oct) for the satellite speakers, continuously
adjustable crossover frequency (40-160hz) for the subwoofer
output, automatic on/off switch (activated by input signal), and a
subwoofer volume control.  Mated with a high quality subwoofer
driver, its 

350W@4ohm

 output is enough to shake your room.

Thermal protection and short circuit protection circuitry ensure
long-lasting durability.  

Note:  1. The auto on is only available on left channel input.

2. This amp is intended to be used with a HT receiver, where phase control is not needed. For 

 

    musical applications, where phase control is important,  we recommend the special edition 

    

amps.

Technical specs

Crossover frequency control

Continuously variable for the subwoofer from 40hz to 160hz, 2

nd

order characteristic (12db/oct). 

Phase control

Continuously adjustable phase lag control on the subwoofer from 0
to 180 degrees.  Not recommended to use. Please use delay time
adjustment on the home-theater receiver to adjust the phase.

Power switch (Auto ON/OFF)

When the switch is in the auto position, the amplifier will turn on
when the left channel input signal is present. There are also ON and
OFF positions that can override this function.

Volume control

Adjust the output level of subwoofer.

Line in

These are line level RCA inputs. Use them to connect pre-outs or
preamplifier outputs. These inputs are summed as mono. It is the
preferred input method. Mono line level signals needs to connect left
channel input. See setup section for more explanation.

Line out

This line level RCA outputs is high-pass at 100hz (-3db) for satellite
output if the amplifier(s) driving the satellite has a line level direct
inputs.

High Level in

Speaker level input. Use these inputs when the line level outputs
from your receiver are not available.  Connect these inputs directly
from the amp outs the drive satellite (or front) speakers.

Summary of Contents for Subwoofer Amplifier

Page 1: ... we recommend the special edition amps Technical specs Crossover frequency control Continuously variable for the subwoofer from 40hz to 160hz 2nd order characteristic 12db oct Phase control Continuously adjustable phase lag control on the subwoofer from 0 to 180 degrees Not recommended to use Please use delay time adjustment on the home theater receiver to adjust the phase Power switch Auto ON OFF...

Page 2: ...n the lower bass band They serve three purposes 1 limit the excursion when excessive rumble signal is present in the input with high damping setting 2 reduce room gain if it becomes noticeable with high damping setting and 3 minor boost at the lower end to further extend the bass extension with med and low damping settings 3 is mostly recommended for vented box or large sealed box For small sealed...

Page 3: ...24db 12db Linkwitz Riley That is 24db oct for the sub and 12db oct for the satellite The anticipation is that the 12db oct roll off of the satellite s natural frequency response will make the overall response as 24db 24db an intended setup for Linkwitz Riley filter This immediately rules out vented ported speakers as front satellite speakers because the setup will become 24db 36db Phase alignment ...

Page 4: ...phase alignment between the subwoofer and satellite at the crossover point For comparative purpose Figure 5 8 taken from a Denon AVR 4800 receiver shows the result when crossover control is at different setting 5 3 2 and 1 o clock respectively while phase control is set at 0 or 7 o clock Note that in Figure 18 a dip is about to form at the crossover point Other Recommendations This subwoofer ampli...

Page 5: ... and off switches Reset the amp After triggering the protection circuitry one can reset the amp by either 1 turn the power switch on the plate to off position and then back to on position or 2 unplug the power core and then plug in again The former is recommended Support Your satisfaction is paramount to us Please feel free to ask us questions or give us feedback ...

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