Question about Yamaha SW118-IV 18" Subwoofer Speaker

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My Yamaha SW118 keeps cutting out (volume reduces to v low level) even when driven by 500W amp. Doesn't seem to be the amp but not sure if the speaker has it's own internal protection. Can anyone advise?

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Poly Switch
All full-range loudspeakers are fitted with a self-resetting
poly switch that protects the high-frequency driver from
damage caused by excessive power.
If a loudspeaker cabinet loses high-frequency output, immediately
remove power from the unit and wait for two to three
minutes. They should allow the poly switch to reset. Reapply
power and check the performance of the high-frequency
driver before continuing with the power reduced to a
level that does not cause the poly switch to interrupt the signal.
On the SW115V/SW118V/SW218V sub woofer, the Poly
Switch protects the woofer and a similar routine should be
followed if its output is lost.

Posted on Aug 29, 2010

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Engine Power Reduced, Rough Idle


Driving around for a couple days- is one thing

Not caring at all & driving for weeks with a check light
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Low oil level by a few quarts,really,how's that possible?

Jan 24, 2013 | 2008 Pontiac G6

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Keeping your SA-DA8 cool


When I first bought this I noticed that it runs very hot even on low volume levels. I took it in for repair and told the tech that the fan didn't come on even when hot. He said "works as designed - the fan is output-power-driven, not temperature driven."

Wishing to prolong the life of ma SA-DA8, I used an old computer power supply and muffin fan. Plugged the PS into the controlled AC output of the amp, and the fan into the PS. Jumpered the "power-on" pins of the PS. Laid the fan on top of the amp, padded with some foam tape, and it now stays a lot cooler (and the fan is very quiet, though not silent.)

on Nov 05, 2011 | Technics SA-DA8 Receiver

1 Answer

I have a Sony CDX-M30 Marine Stereo that when the volume is turned up over 20, it cuts off, then comes back on and if you don't turn it down, it cuts off again. Recently, it only has to be around...


One possible cause is a mismatched speaker system. Most stereo equipment specifies 8 ohm speakers to match the 8 ohm amplifier output resistance. A well known electronic formula states maximum power transfer occurs when the resistance in and the resistance out are equal. When there is a mismatch, more power is required to obtain the same sound pressure levels. By turning the volume up higher to do this, the electrical requirements to drive the speakers at that level may be exceeding that which the amp can provide. When this happens, the amp shuts down due to overload. Continued operation in this condition can cause permanent failure.

Another possible cause is the power requirements of the speakers to be driven properly. Larger speakers require more power to move the speaker coil and and cone. Connecting a speaker that requires 10 watts to be driven to an amplifier that provides up to 8 or even 10 watts will require that the amp be operating at 100% of capacity. An amplifier run like this will have a short life.

Connect speakers that match the amplifier's impedance requirements (8 ohm types are pretty standard / common) and will operate with the amount of power (in watts) that the amp can supply. Make sure you're comparing watt ratings in similar units. "P-P" (Peak to Peak), "Peak" (or Max") and "RMS" are typical terms. RMS is the is the most common standard used, but as you'll see below, some manufacturers like to use different units to make their products seem to have more power than they actually do. You can convert easily between the terms like this:

200W P-P equals 100W peak, and also equals 71W RMS

"Peak" is 1/2 the value of "Peak to Peak" (P-P) and "RMS" which stands for Root Mean Squared, is 70.7% of Peak. 200W P-P sure sounds like it's more than 70W RMS - doesn't it? It's all pretty simple once you know. Lastly, the fictional unit "Music Power" can be anything really, but is often either Peak or P-P values. It's just more smoke and mirrors by some manufacturers.

I hope this helps and good luck. Please rate my reply. Thanks!

May 12, 2011 | Sony CDX-C5005 CD Player

1 Answer

Is it possible to connect two jacks simulteanously to a speaker like S115 or SW118 coming from 2 different channels of a power amplifier like P5000S' please advise thanks


the s115 and p5000s are power matched for a single channel.
IE - the s115 is rated at 500W and the p5000s is 500W PER CHANNEL.
If you're trying to drive a left/right signal into a single speaker, you need to mix the left right signals together at the input side, and put the mix into a single channel of the amp, and then into the speaker from that one channel.

The other option is to have 2 s115's - one on each channel.

Mar 25, 2011 | Audio Players & Recorders

1 Answer

MTX Thunder series 7402 Amp cutting out at Hard pound.


Most likely the ohm load is too low, if you have the subs wired in parallel rewire them in series and see if that resolves the problem. if not then you do not have enough battery power to support the draw that the amplifier pulls. if the vehicles voltage drops below 11.5 volts the amplifier will momentarily shut off, similar to how the lights in your house dim when the a/c cuts on due to the sudden power draw. hope this helps. p.s. if you cant afford another battery right away, lowering the crossover frequency to around 65hz will greatly reduce the amount of current necessary to keep the amp pumping. (in my opinion it sound better that way anyhow.)

Apr 28, 2010 | MTX Thunder 81000D Car Audio Amplifier

1 Answer

Amplifier cuts off after raising the volume


just a tad is all that it takes to throw it in protect mode so check the gain and the cross over and make sure they are set at a decent level and see if that works a little bit

Mar 30, 2010 | Jl Audio 500/1 Car Audio Amplifier

4 Answers

Amp switches off at about -10db volume level


I suppose that on all speakers connections + (positive) is on +, and - (negative) is on - ?

Oct 08, 2007 | Yamaha HTR-5830 Receiver

1 Answer

Interior speakers cut out when the volume is turned up


You may have speakers of an incorrect impedance attached to the unit since the problem occurs when audio signal level is increased and the current goes up.The unit is shutting down to prevent damage. I would check the speaker connections and make sure that the speakers impedance are matched for the unit you are using.

Sep 03, 2007 | Eclipse EA3422 Car Audio Amplifier

4 Answers

Yamaha YST-MSW10 subwoofer quits after about 10 minutes


This problem can be solved by either of the following:
1/ Modify the PCBA to prevent the auto shut off feature from working. This is done by adding a 20k ohm resistor across pins 1 & 2 on the timer IC6. This resistor will prevent the timer from turning off the amp. To do this, unplug the amp. Remove the 8 screws on the perimeter of the rear of the amp. Carefully remove the rear plate. Disconnect the speaker wires at the speaker and the front panel connection on the main board. Locate IC6 on the bottom of the main board. Solder a 20k ohm resistor (1/4W) across pins 1 & 2. Pin 1 and Pin 8 are noted on the board. Be sure to insulate the leads of the resistor to prevent contact with the board. See picture. Re-assemble in reverse order.
2/ Some 5.1 channel amps allow independent control of the volume for the subwoofer in their setup. Check your amp to see if you can raise the signal level going to the subwoofer to prevent the amp from shutting off. You can then dial back the volume of the subwoofer using the volume control on the front._436.jpg

Aug 07, 2007 | Yamaha YST-MSW10 Computer Speakers

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