Question about Marantz Ma-500 Monoblock Thx Amplifiers 3

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Standby light and buzz on my amp

I am running two MA 500's to my front speakers (bi-amped not bi-wired). I got careless while changing speakers and the speaker wires touched + to - . I now cannot get power on the amp whose wires touched and the other that is connected by RCA (daisy chained) is now buzzing and the standby light is on whenever the amp is powered up. I can still get signal to the speakers while the standby light is on... Please help!

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6ya6ya
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Posted on Jan 02, 2017

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hokuwho
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SOURCE: buzz in amplifier power transformer.

All transformers buzz though you cannot hear it normally. The big transformers on power lines like to buzz for all to hear. When a transformer in a stereo amp gets old and deteriorates or gets hot and  expands the coils, melts the coil varnish and epoxy coatings then rattles at 60 times per second.    You can ignore it or change the transformer. There are too many layers of windings to try to stick anything in there.  Disconnecting a transformer results in inductive kickback -that's not money. It's a big, whopping electrical gotcha! Be careful! Good luck, Steve Medley

Posted on Nov 09, 2008

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mrwtech
  • 59 Answers

SOURCE: How do I connect a Polkaudio powered subwoofer (psw 125)

Connect a set of stereo RCA cables from the 'Output 2' on the Hafler to the line imputs on the Sub.Turn on the '1+2' output switch on the Hafler and rock out!

Posted on Dec 17, 2008

SOURCE: Marantz sr8001: standby light blinks rapidly,

Hello there Ed.

For anyone that has ever had such an issue with a MARANTZ SR series (6001. 7001. 7002. 8001...etc...) issue a question and I do HAVE the answer.

I could be just anything, or just the low quality binding posts used by MARANTZ for that.

Please describe to me in details how you've connected your speaker wires at the back, and give me description when and how did this problem came up.

Kind regards
Evangelos

Posted on Nov 04, 2010

smarthome2
  • 1114 Answers

SOURCE: Harman Kardon AVR 350, Unit powers off into

It needs to be serviced. Bad caps, resistors, & possibly a transistor or two. Not an unbearable repair, but you can count on it being 100-175 depending on the shop. You followed all the troubleshooting you could without opening the unit.

Posted on Oct 02, 2013

  • 39260 Answers

SOURCE: Marantz NR1402 AV receiver Going to standby Mode

There could be a short in one (or more) of the speaker connections. Try disconnecting all speakers and turning on the receiver. If it still switches to standby, there may be an internal problem.

Posted on Mar 03, 2014

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My $.02 is you add complexity, waste speaker wire (which can be expensive if you subscribe to the theory that wire can change the sound other than at the cash register, but don't get me started on that), amplifier resources, and MAYBE you'll think you hear an improvement. Perhaps if you lived in an anechoic labratory you might. I think it's a crock.

http://www.brilliancehifi.co.uk/how-to-bi-wire-speakers.htm

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Bi-amp


After examining a picture of a 5802 ( I have been servicing adcom for over 20 years ), these are not bi amp posts, but bi wire posts.

Bi-amp means that 2 amps are being used, one for highs, one for lows. This means that you have no crossovers in the speakers, instead, you have an electronic crossover between the amps and the pre-amp. The highs and lows are separated in the electronic crossover. One amp handles the lows, one handles the highs.

Bi-wire means that you have the crossovers still inside the speakers. The amp handles the full range of music ( highs-mids-lows ). Different kinds of speaker wire produce different results. If you have bi-Wire terminals on your speaker, they come with shorting wires, that tie the tweeter + to the woofer + on the back of the speaker, and the tweeter - to the woofer - . When the shorting wires are removed completely, you have now electrically separated the tweeter and woofer from each other, while maintinaing the crossovers ( inside the speaker ) for each.When this is done, you can now bi-wire the speakers and amp, and use different kinds of wire for the lower frequencies and the upper frequencies, depending on your ears ( everyone hears a little differently, thats why there are so may makers of components, and wire ).

Why do we have crossovers?.....the tweeter voice coils ( the things that make the sound ) are made of hair thin wire. This wire cannot handle much power and if you were to put bass in to a tweeter, you would burn the tweeter out almost instantly. A tweeter is a very light, fast moving device which can react very quickly to high frequency sounds ( symbols, triangles, guitar strings....). Woofers are more rugged. They have voice coils made of heavier wire and are designed for larger movements that Bass demands. Subsequently, woofers aren't very good for high frequencies because they are slower devices.

So what do we do ?.....Keep the lows away from the tweter and the highs away from the woofer.....thats the job of the crossover.

In the event that your speaker has the crossover OUTSIDE the speaker box, you should check ( as always ) with the manufacturer of the speaker to see how it can be changed to suit your needs. Remember to always read and follow your owners manual. Good luck....Rob

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