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No sound out of the Amplifier.

I have a Crate - BT50 - Bass Combo Amp. It powers on and all the lights light up and everything, but I get no sound out of it. I know the woffer is good and the fuses are good, so what may be the problem???

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  • 165 Answers

Hello if you not even heard a low buzz en the speakers with all volume up is probably burned take it to rapier shop for a estimated saludos

Posted on Jan 08, 2009

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My sony STR-DE475 has no bass. The bass just went out after running it for 6 hours.


Either the subwoofer speaker or its amplifier failed - they couldn't handle the extended use. Simple test to find out which: put the volume really low, connect another subwoofer (or a large normal speaker) to the bass output on the receiver and play some music. If you get sound then the original subwoofer is faulty, just get a new one. If you don't get sound then the amplifier for the subwoofer channel has failed. You could replace it yourself if you have enough electronics repair experience, otherwise it will be cheaper to just get another good sh low end receiver from a site like Ebay.

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Hello im sorry but not speak english a litle, im need picture of power amplifier crate model spa-1200 made in u.s.a.fabricated for slm electronics,1400 ferguson ave. st louis mo. 63133 and not found...


Hi,here is the one upper version of it as "Crate SPA1400 model " 1400 watt Stereo Power Amp.they are identical ..
Hope this helps! Take care and please Remember to rate/vote and give me 4 Thumbs Up for me to continue for Helping out the Community :) Thanks

Crate SPA1400 Stereo Power Amphttp://cgi.ebay.com/Crate-SPA1400-Stereo-Power-Amp-/270771488929?pt=LH_DefaultDomain_0&hash=item3f0b3d08a1

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Technics su z2 amp shuts off sound


hello. we cant help if we dont know what music source you are using.

Apr 13, 2009 | Technics SA-AX530 Receiver

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CRATE PA-B6350 no output


The 2 speaker jacks are wired in parallel. If your subs are 4 ohm rated the amp is seeing a 2 ohm load and may be trying to protect itself - hence the red light. I would suggest you unplug 1 of the subs and see if the problem goes away. You may have a problem with one of your subs. This amp is probably not the best choice for such demanding work as it is not fan cooled. Good luck.

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I have a crate BX 160 that shuts down at the point where it starts limiting and then after a about 30 seconds. it starts back up. I would like to get a schematic on this particular piece of equipment...


I just saw your post. I happen to have a Crate BX-160 and was able to call Crate in St. Louis and talked with a tech there at the plant and he actually sent me full schematics for free.

Your problem, based on my electrical background and fixing audio equipment for 10 years, seems to be related to the built-in limiter in the power transformer. In other words, you might just need a new power transformer and it is a piece of cake to install (all push-on connections).

The schematic will show you the many test points for voltage checks, but unless you know what you are looking for, its just information overload. It is a rather simple amplifier and built resonably well. I have been using mine since 2003 and have fixed it a few times (age related problems like loose connections). There just is not much to go wrong on them except for the fact the amp is subjected to extream vibration. THis causes physical connections to fail resulting in vexing issues that are hard to solve. This is not unique to this amp (all bass amps).

I would bet anything your problem is the power supply shut-down circuitry is malfunctioning. In my expereience with amps, unless the amp is drawing current (failing power circuitry) and making strange sounds, the failure is usually not related to the power section failing (like power transformers going out). Likely, the built in limiter is the problem.

I hope this helps!

-mike
(development engineer)

Jan 20, 2009 | Audio Players & Recorders

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I have a crate Bass amp that is generating a distorted signal from the imput instrument and it will not clear up :what may be causing this condition on this unit?? Cc:Perplexed!!


Without hearing the distortion, it will be difficult to state with any confidence where in the amp the problem exists. That being said, the most common problem is with the preamp section. Many of these use 4558 chips as the pre-amp section. If hte chip is blown, the sound may still be heard, but it will be distorted. This is easily seen on a scope. The chips can be purchsed in bulk for les than $1, so the parts cost for the repair should be low.
Dan

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Un-known red light


Your bass in to high on the receiver or you need to upgrade your speaker wire to handle the power given to your speakers. Or you speakers can not handle the power of the amp. but 1st try adjusting your Bass Level down some to see if that works.

May 21, 2008 | Kenwood VR-209 Receiver

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