Marantz 7300 OSE noise - is there a fix?

Discussion in 'AV Receivers' started by ChrisAG, Apr 7, 2006.

  1. ChrisAG

    ChrisAG Supporting Actor

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    A couple of years ago there was a lot of talk in this forum about a high pitched whine coming from the centre channel of the SR7300 & OSE models. I forgot about this issue when I picked up a used OSE a couple months back. Unfortunately, the unit I have exhibits this problem. Basically, when a signal is sent through the receiver there is a high-frequency whine from all channels, but it is loudest from the centre. The intensity varies depending on the DSP mode and whether Source Direct is engaged. It is loudest when in any surround mode and in digital, and it is least noticable when in analogue stereo in Source Direct.

    I don't recall a fix ever being discussed. Has anyone ever had their 7300 successfully repaired?
     
  2. Steve Turner

    Steve Turner Auditioning

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    I sent my 7300 OSE back to Marantz for repair through my dealer. It took 2 months but it came back successfully repaired.
     
  3. gregD

    gregD Second Unit

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    Here is contact info for authorized Marantz service in the US... no info for Canada.

    Servicewide
    2239 Curtiss St
    Downers Grove IL 60515
    630-969-7333

    They did some mild repair work on an SR5000 for me a few years ago... the guy I talked to seemed well versed in Marantz issues.
     
  4. ChrisAG

    ChrisAG Supporting Actor

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    Steve - Did Marantz say what the culprit was? I'd like to tell the repair guy here what part might be at fault.

    Greg - thanks for the info, I may give them a call.
     
  5. ChrisAG

    ChrisAG Supporting Actor

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    Finally got it fixed through D&M Canada. I had to do a lot of research for them, since (I assume) with the Denon merger, the history of a three year old Marantz model wasn't at the forefront of their minds.

    Turns out that a capacitor change greatly reduces, but does not completely eliminate, the high-pitched whine. The noise is now only noticable from the centre when I put my ear within two feet of the speaker, and it is almost completely gone from the other channels. I can no longer hear it from any realistic listening position, so I'm happy with the results, since the 7300 sounds great otherwise.

    In the course of my research I called both Servicewide and Marantz USA, reasoning that in the bigger US market they would be more aware of the issue.

    The guy at Servicewide claimed to know how to fix it, but refused to tell me how, saying it was not in his "best interest," i.e., he does nothing for free. I can understand a businessman needing to make money, but I was calling from a different country asking for some advice, and he basically hung up on me. Marantz USA was hardly any better, with the rep saying he "vaguely remembered that issue with the 7300" but would not elaborate, or put me in contact with anyone else.

    That was a frustrating day.

    I can't praise the people at D&M Canada enough though. It took five weeks, but at least they fixed it, were polite, and the repair cost to me was minimal.
     
  6. John Garcia

    John Garcia Executive Producer

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    That's great news man. Congrats. Sorry it was such a hassle to get there though...
     
  7. Chris PC

    Chris PC Producer

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    I listened to Chris's 7300 ose when he had a few folks over for pizza, wings and movie watching. The 7300 ose sounds really nice. It sounds essentially similar to the 7000 and 8000 I am most familiar with. All in all, the 7300 ose sounds great with music and was awesome watching movies. Nice subwoofer too [​IMG] Thanx Chris for the fun movie night.
     
  8. ChrisAG

    ChrisAG Supporting Actor

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    Thanks Chris, glad to have you guys over. Now that it is repaired I think the 7300 will be around for a few years... love the build and sound on that baby.

    It's too bad no magazine ever did an A-B test to compare the regular 7300 to the OSE model. I can't help wondering if the tweaks improve the sound or are more of a marketing strategy. Can't hurt though :^)
     
  9. Jeff D.

    Jeff D. Supporting Actor

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    Good to hear you got the OSE fixed Chris. It was definitely a gem in the Marantz catalog, much like the x000 series before it.

    Enjoy!
     
  10. ChrisAG

    ChrisAG Supporting Actor

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    Thanks Jeff;

    I'm always curious as to how sound characteristics (and build quality) of receiver models changes year over year. The 7300ose has much more detail and probably a wider soundstage than my previous 6200, and is far better for HT, although I think the 6200 wins for bass production without a subwoofer. Would you say the sound changed much from the 7300 to the 7400 & 7500?
     

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