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Matt Schoenfeldt
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Last seen: 1 year 4 months ago
Joined: Jul 8 2020 - 7:58am
Bad sound: Impedance mismatch suspected?

Hi All, first time poster here.....looking for any wisdom on poor sound quality (tinny/fuzzy/buzzy treble, lack-luster bass). Am using a Yamaha RX-V685 Ampli-Tuner (https://usa.yamaha.com/products/audio_visual/av_receivers_amps/rx-v685_u/specs.html#product-tabs) to power Martin-Logan Aerius i speakers (https://www.martinlogan.com/en/product/aeriusi#specs). While the speaker note Impedance of '4 Ohms, 1.7 at 20kHz Compatible with 4, 6, or 8 Ohm rated amplifiers', I suspect that this mismatch could be source of poor output. For what it's worth, input is Pro-Ject turntable with high quality Ortofon cartridge & 180g vinyl albums. Speaker wires are proper gauge monster cable equiv.
Any critique/guidance hugely appreciated! Sincerely, Matt

Old Audiophile
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Last seen: 1 week 4 days ago
Joined: Jun 15 2017 - 7:34pm
Howdy, Matt!

Matt, I am by no means an expert on this. Journeyman, at best. As such, the best advice I can give you would be to speak with a knowledgeable stereo shop owner who knows what s/he is talking about and/or with some technicians at on-line sellers like Crutchfield, Music Direct, Audio Advisor, World Wide Stereo, Audio Advice, etc. That being said, personally, I have found that 4 ohm and 6 ohm nominal load designed speakers tend to perform best when they are fed high current from a good amp. High current does not necessarily equate to high watts of power. I think your amp would do better with 8 ohm nominal load speakers. Good Luck!

absolutepitch
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Last seen: 2 months 2 weeks ago
Joined: Jul 9 2006 - 8:58pm
More info needed?

Matt, From your list of equipment, there should not be any anomaly with the sound, assuming everything is installed properly. I assume that your cartridge is likely a magnetic one and the amplifier's phono input accepts magnetic cartridges. The speakers may be the issue (https://www.tonepublications.com/old-school/martinlogan-aerius-i-loudspeaker/). Those are good speakers, so I would have thought it's not the issue.

If you could provide a bit more information on what tests you may have performed, any more detail on what it sounds like, or anything you have noticed since your post.

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