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Mackie SWA 1501 limiting problems, I seem to be getting the limit switch on the back of the mackie bass bin coming on constant.The levels of the mixer are fine,could there be a problem with mains source? Cheers!!

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Yes it maybe mains proplem and you must check it with voltmeter to solve your problem

Posted on Jun 28, 2008

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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.

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I have a pair of Peavey Impulse 1012 4ohm amp a Peavey XR 696f was not geting enough bass ( use a Yamaha TYROS keyboard & Vocals) so i purchassed a pair of Peavey messanger Pro 15 Sub Cabs 4Ohm cant...


Hi fingers 1

There will be some overlap in bass response that you may need to tune out to tone down the boomy bits. You could tune this out with a 31 band EQ Another approach is to use a crossover or low pass filter to the subs to get some control over your bass frequencies. Another thought, if you're using the rig for stage work, how does it sound out the front. It may be standing waves created by the bass bins, moving them to different monitoring positions may also help.

I am more than happy to answer any other questions you may have about it, just give me a hoy :) If you are still unsure, or have problems, then before you give a rating for this advice, please get back to me and we can try some more things.
Thanks for using FixYa, If you consider the advice I have given you as sound, a FixYa rating is a great reward for my efforts to help you. Cheers.

regards
robotek

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