Question about Marantz Audio & Video Receivers

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My Marantz 2270 gives off a crackling sound through my Infinity sm-115 speakers anytime there is a lot of bass in a song. What do I need to do to fix this problem. I'm almost positive it is the reciever that is causing it. -Korey

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  • Tom Sep 29, 2013

    It's time for a "recap", to replace those old dried up electrolytic capacitors most likely. You can buy a kit with all the caps and replace them yourself if you know how to desolder and remove the old ones and solder in the new ones. If you have a geek friend who can solder then they can help you.

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It sounds like one or more of the channels is letting some DC current through or that the front end is breaking down. In either case, the parts required to fix it are generically available and cheap. Figure on $10-$20 in parts at any shop that deals with audio components. One thing you can do to help narrow this down is to see whether the behavior changes with heat. Do you get the same results upon startup? Does the problem get worse as the unit works (gets warm)?

Dan

Posted on Feb 23, 2009

  • lisettlor576 Oct 11, 2010

    I have the same problem but only from the right speaker. What parts are you referring to in order to fix the problem?

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Marantz SR-66 Shut down!


Sounds like the protection circuit is tripping. With power off, check for loose speaker connections. Also, look very closely for shorts in the speaker wires. Even a single loose strand can touch another connection and create a short, which shuts down the receiver.

I would take take the frequency splitter out of the circuit and see what happens. Check for acceptable impedances in the manual. The receiver may not like the load the splitter presents.

The receiver may have settings for bi-amping. Then you use one set of terminals on the back for treble, and a different set for bass.

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I don't know if it is the speakers or the marantz 2270. But when I turn the volume up I get poping sounds threw the speakers. At low volume it's fine. Do I have something hook up wrong?


First you need to make sure the speakers are hooked up in phase. +from the amp to + on the speaker. Left and right the same. If the speakers are more than 5 years old you need to check the foam suround if it is cracked or disintegrataed. Having them refoamed could solve the problem. You also need to look around the dust cap if you see a stress ring in the cone then the speakers have been lpushed too hard and need to be reconed or replaced.

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I have Imperial 4 speakers circa 1971. One of the woofers popped the center black cap and is now fuzzy at moderate bass levels. Can I get a replacement speaker somewhere? Thx, Rich


I do most of my vintage audio shopping on eBay.

You could probably get a whole pair of them for less than sourcing the individual woofer.

http://cgi.ebay.com/Marantz-Imperial-IV-Speakers-model-4-nice-cond-/290510404317?pt=Speakers_Subwoofers&hash=item43a3c4fadd

Ends Dec 15, 201019:15:17 PST - Right now at $15.00 with $15.61 shipping.

Or maybe you just need to refoam them....

http://www.simplyspeakers.com/marantz-speaker-foam-edge-repair-kit-fsk-3.html

At $26.00 for this kit, I'd opt for whole speakers.

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My Marantz 2270 sounds great when first turned on, for about 20 minutes. Then it starts crackling very loudly on both channels. Is it expensive to get this fixed?


No, it's not expensive to get fixed. The circuit board has over heated through time and some of the solder connection have weakened. Inspect the circuit board for cold solder connection and reapply heat and solder.

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This sounds like you may have a lot of solder connections on the amp board and the power supply board to be resoldered. After a few years of using the unit they can get heat stressed and develop cracks in them. The sooner you get this fixed the better. NAD is a very good brand of stereo and in most cases they are well worth getting fixed. If the stereo is used for too long it can develope some component break downs that would cost much more money to repair.

Sometimes the static or crackle sound is just the volume control or other controls like the balance or teble or bass controls that just need to be cleaned with the proper type of electronic contact cleaner.

I hope this helps, have a nice holiday season,

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I'm amateur radio and engineer

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