LSiM 707s: 2.5-3 dB difference
alucididea
Posts: 113
So I hooked up my new preamp and as I was listening and setting up, I’m hearing a solid difference in output between the 707s. When the balance is even, I’m clearly hearing the right channel higher. And even when I I shove the balance over 2.5-3 dB, they sound sort of even, but even the right still pushes more high frequencies. It’s driving me pretty crazy, truth be told.
I’m going to hook up a couple other sets to speakers to troubleshoot before I contact Polk. I’d rather not have to try and send one/either of them in, especially since both the boxes got relatively destroyed in shipping.
Is this sort of thing normal in production to have such a difference between units?
I’m going to hook up a couple other sets to speakers to troubleshoot before I contact Polk. I’d rather not have to try and send one/either of them in, especially since both the boxes got relatively destroyed in shipping.
Is this sort of thing normal in production to have such a difference between units?
Comments
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No, I'd be checking the bias on the preamp before condemning any speakers.
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No bias switches on either amp or preamp. NAD M22/M12No, I'd be checking the bias on the preamp before condemning any speakers. -
Reading the first post (to me) indicates that this issue only presented itself after the preamp was installed. If this is wrong, please clarify.
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Reading the first post (to me) indicates that this issue only presented itself after the preamp was installed. If this is wrong, please clarify.
That's my take also.
If the new pre is of substantial improvement over what you had been using, what your hearing may be just simply a better separation of instruments and imaging. Also placement of the speakers in relation to your listening position and room reflections can also give the illusion of one speaker being louder. I highly doubt it's the speakers.
Check all your wire connections also.HT SYSTEM-
Sony 850c 4k
Pioneer elite vhx 21
Sony 4k BRP
SVS SB-2000
Polk Sig. 20's
Polk FX500 surrounds
Cables-
Acoustic zen Satori speaker cables
Acoustic zen Matrix 2 IC's
Wireworld eclipse 7 ic's
Audio metallurgy ga-o digital cable
Kitchen
Sonos zp90
Grant Fidelity tube dac
B&k 1420
lsi 9's -
Any updates?
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Sorry, none yet. I’ve been a little too busy to do a full troubleshooting with it all.Any updates? -
Sounds obvious, but did you switch the speakers and move the right one to the left and the left to the right? If the one speaker is still lower when moved, then you've isolated it to the speaker. If it's still the right channel, then it's your pre or room. Best way to see if it's the speaker though.Speakers
Energy RC-70 Mains, Energy RC-LRC Center, Energy RC-R (x4) Rear Channels, Energy RC-R (x2) Front Effects
Polk 5jr+
Polk SDA 2B
Polk SDS 3.1TL
Equipment
Panamax 5510 Re-generator Power Conditioner
Yamaha RX-V3800 Receiver
Digital Sources: Sony CDP-X339ES CD Player, HHB CDR830 BurnIt Professional CD Recorder, Sony PS3, Oppo DV-983H DVD Player
Analog Sources: Sony TC-K890ES Cassette, Nakamichi DR-1 Cassette, Technics SL-7 Turntable -
So I tried switching the channels at the input, no help. I just switched the speakers a few minutes ago. In both cases it still leans to the right, so it’s not the speaker.GospelTruth wrote: »Sounds obvious, but did you switch the speakers and move the right one to the left and the left to the right? If the one speaker is still lower when moved, then you've isolated it to the speaker. If it's still the right channel, then it's your pre or room. Best way to see if it's the speaker though.
If it’s not the speakers or the pre, it’s either the cables or room. Obviously I’m trying the cables next. -
Room dynamics for me always changes the perceived output of each side. I have windows/Wall left and open right so it always sounds louder from the left side. I’m sure that’s obvious but...
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I’m not positive, but I think I may just have some hearing loss in my left ear. Maybe one too many loud concerts or something. Guess I’m going in to get my hearing checked...
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Can you use a db meter app or db meter to test individual channels? Or, unplug a speaker and do it the old fashioned way
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Maybe. I didn’t even think to check for an app. I’ll have to look into that.Airplay355 wrote: »Can you use a db meter app or db meter to test individual channels? Or, unplug a speaker and do it the old fashioned way -
I have a free db meter app just called db meter. Seems to do the job well enough. It's not something I would use to setup room correction software but maybe it will help you figure out if one speaker is a few db lower than the other. It's an iOS app but maybe there's an android version as well.
