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Bash 300S Digital Subwoofer Plate Amplifier 300W RMS

Brand:|Model: 300S|Part # 300-750
BASH's patented 300 watt Subwoofer Amplifier technology was developed to offer extreme amounts of power with an efficient operation that escapes most traditional amplifier designs.
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Regular Price$168.70
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Part # 300-750
  • High power output in a compact, lightweight design
  • Speaker and line level inputs for connection to any stereo
  • Limiting circuit prevents audible clipping and protects woofers
  • Auto On/Off and phase reversal switch
  • No wasted heat and energy for efficient operation

Product Details

Bash 300S Digital Subwoofer Plate Amplifier 300W RMS

BASH patented amplifier technology was developed to offer extreme amounts of power without the wasted heat and energy of traditional amplifier designs. Add to this an intelligent circuit design, and you get benefits such as extremely low distortion and high signal to noise ratios. The combination of clean output and high power makes the BASH amplifiers some of the best sounding subwoofer amplifiers on the market. Features: 50 to 150 Hz low-pass crossover, 0° or 180° phase, line level inputs, speaker level inputs, LFE input, master on/off switch, auto on.

• 300 watts RMS @ 0.5% THD into 4 ohm load
• Signal to noise ratio: 105 dB (A-weighted)
• Line-in and high-level in crossovers: Adjustable 50 to 150 Hz, 12 dB/octave low-pass crossover
• LFE-in crossover: Fixed 330 Hz, 12 dB/octave low-pass crossover
• Power requirements: 120 VAC, 60 Hz
• Dimensions: 11" W x 7" H x 4" D
• Cabinet cutout: 10" x 6-1/4"

Connections and ControlsOn/Auto/Standby Switch   Set to Auto to allow the amplifier to automatically turn on and off as a signal is sensed. Set to On for "always on" mode. Set to "Standby" for standby mode.
Phase Switch   0° or 180° selectable, 0° is normal phase, 180° will reverse the polarity of the subwoofer output
Volume Control   Adjusts the output level of the amplifier
Freq   Sets the low-pass crossover frequency, adjustable from 50 to 150 Hz
Line Level Inputs   For connection to a full-range stereo line level signal, use the left and right line level inputs; the on-board low-pass crossover will be in effect. For connection to the subwoofer out on a home theatre receiver, use either the LFE input to bypass the internal crossover or the Left or Right input for additional crossover flexibility.
Hi Level Inputs   Allows the connection of the amplifier to a speaker level output from a stereo amplifier or receiver
AC Mains Input   Fused IEC input with 3 amp 250V GMA-style fast blow fuse; accepts standard male IEC cord
On/Off Switch   Turns master power on and off

Modifying Bass Boost

1.   Locate R26 and R25 on the pre-amp board, the default values are R26=30K and R25=120K. R26 and R25 are located on the small vertical PC board adjacent to the phase reversal switch.

2.   Remove the existing resistors by using a low wattage soldering iron and desoldering braid. Be careful not to apply too much heat to the PC board traces.

3.   Using the charts below, determine the proper resistor values to achieve the desired boost. New resistors can be any wattage 1/4 or greater, but 1/4 will physically fit best. Note: values are in k Ohms.

4.   Install the new resistors and solder in place making sure you put the correct resistor in the proper location.

Bash 300S Digital Subwoofer Plate Amplifier 300W RMS
  • BrandBash
  • Model300S
  • Part Number300-750
  • UPC844632001383
  • Product CategorySubwoofer Plate Amplifiers
  • Unit of MeasureEA
  • Product Rating
    (157 Reviews)
  • Weight3.75 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

View similar products to the Bash 300S Digital Subwoofer Plate Amplifier 300W RMS
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Bash 300S Digital Subwoofer Plate Amplifier 300W RMS
Bash 300S Digital Subwoofer Plate Amplifier 300W RMS is rated 4.3503 out of 5 by 157.
Rated 5 out of 5 by from Worked Well for my Polk PSW-505It looks great, sounds great, and has functioned perfectly for about 8 months now. Turns itself on and off to save power, not that you will notice. Has way more power than I can use. Ive tried all the inputs, they all work fine. The only improvement I can think of would be a crossover that goes down a bit lower. I have mine set to 50hz, and I probably would prefer 40hz, as I have large full range speakers.
Date published: 2015-12-18
Rated 5 out of 5 by from produces more intense lowsreplaced a 500 watt amp and produces more intense lows than my 500 watt amp hooked to a JL gold 15".
Date published: 2015-11-03
Rated 3 out of 5 by from OK Amp, Poor CoolingI used this amp to power a subwoofer I built years ago. Big acoustic suspension, not-ported, with a 15" down-firing driver. It is efficient so I don't have to drive it very hard. The volume is stuffed with fiberfill for damping.The problem with this amp is it has a couple aluminum heat sinks hanging off the main plate and the main transistors are heat-sinked to these. But a plate amp should be heat-sinked to the PLATE. I wondered about the design as I installed it... Anyway, it died for no reason after a year or so. One of those sinks is hot. I suppose it overheated.If your sub has a big resonant cavity inside with no stuffing, this amp might be ok. It will establish thermal convection with the internal volume. If you stuff for damping, buy a plate amp whose transistors heat sink to the PLATE.
Date published: 2015-09-20
Rated 5 out of 5 by from Very clean sounding ampI am very picky when it comes to bass. I decided to purchase the amplifier plate and pair it with the Dayton Audio RSS390HO-4 15 and OMG!!! I just put it in a 19H×16W×20L box temporary. Sounds amazing. To think my project will include 2 15" subs and 2 Bash amp plates! Built into my horn towers.
Date published: 0004-04-02
Rated 1 out of 5 by from Evidently a limited life-span...Worked flawlessly (almost to the day) for two years - then died. All lights are on, no protection circuitry 'tripped' or blown fuse, just stone dead. You would think they could make a product to last more than 2 yrs., especially under light use, as was the case with mine.
Date published: 2015-09-06
Rated 5 out of 5 by from Infinity IL-100S Sub WooferThe amp in the Infinity IL-100S quit. I replaced with this one. Plate on this one was a little smaller so I made an insert from 1/4 inch plywood. Also had to install new connectors to fit the Infinity speaker. Works great. Very good sound from my old Onkyo system. Tested on Eric Clapton Guitar 2014 Festival and it has put life back in the system. I did learn when I took out the old Infiinty amp that is was also made by Bash. Would recommend to anyone needing a good medium power subwoofer amp.
Date published: 2015-05-25
  • 2016-02-09T06:20CST
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Product Q&A

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Bash 300S Digital Subwoofer Plate Amplifier 300W RMS

Will this sub amp work with a 250 watt 12 inch subwoofer

Asked by: Master97
As long as the subwoofer is rated at 4 ohms or higher this should be an excellent match.
Answered by: Chrisf
Date published: 2016-02-05

What is the brand name of this plate amplifier? BASH is only an acronym for the technology used in there amps.

Asked by: Pain for Fun 1980
BASH is indeed the technology, but they have also adopted it as their brand name.
Answered by: Chrisf
Date published: 2016-02-01

Hello. Do the high level inputs accept banana plugs?

Asked by: Jawing
Yes, they have protective plugs that would need to be removed, but when they are removed they will indeed accept banana plugs.
Answered by: Chrisf
Date published: 2016-01-27

I have an Infinity TSS-Sub800 that I need to replace the amplifier plate. Is it worth repairing or replacing the component. I see that the Bash 300S or the Yung SD300 looks like they might work. Any recommendations you can provide.

Asked by: David8587
We do not have a cross reference available for this type of thing. Please contact our tech support for more help with this question, or 800-338-0531 x1.
Answered by: MattP
Date published: 2015-12-21

will this item work with my Klipsch RW-12D?  My amp isn't working anymore

Asked by: robytaylor
We do not have a cross reference available for this type of thing. Please contact our tech support for more help with this question, or 800-338-0531 x1.
Answered by: MattP
Date published: 2015-12-08

BASH 300W amp on my 6 yr old Episode C5-SUB12 keeps blowing fuses.  Will this work as replacement?

Asked by: Phil B
We do not have a cross reference available for this type of thing. Please contact our tech support for more help with this question, or 800-338-0531 x1.
Answered by: MattP
Date published: 2015-11-30
  • 2016-02-09T07:11CST
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