I have the same thing, L,C,R silent, surround slight hum, rears bit more of a hum. The hum doesn't get louder with the volume and I can't really hear it from where I'm sitting. I always figured it was the smaller the speaker the bigger the hum especially with very sensitive speakers like Klipsch plus the low RMS (compared to my center and mains).
I did have a slight hiss from my center as well but I switched my L,C,R to XLR connections and that fixed that. Plannning on getting XLR for the rest as well. I'm curious to see if it'll have an effect or if it's just the amp/speaker combo.
Edit: I might not have the "same" thing but it's similar.
Front speakers are dead silent. Back left and right have a slight hum
Any thoughts to why? Or a way to fix
Edit. Doesn't matter which channel I plug hem into. They still have the gym. And only the surrounds
You may have already done these things but, Are you using the same wire type to all speakers. Can you get access to the wire or are they in wall. Did you move one of the speakers to a different position like a front to see if it follows the speaker. Do you have any spare wire to run a temp. to the speaker or speakers. You say you moved the outputs to a different channel and they still do this?
XPS-1 Decware TORRI JR Decware ZP-3 Phono Stage Decware Z-ROCK Monster Power HTPS 7000MKII Furman PL-PRO DMC 20 amp power conditioner VPI Signature Classic OPPO BDP-95 Sonist Concerto 4
Trouble shooting 101, there are 5 pieces of hardware involved; 1. Speakers 2. Speaker cables 3. Power Amp 4. Interconnects 5. Processor/AVR
What we are looking to do is isolate the source, hopefully it's only one source, but it can be a combination.
So the first job is to swap only #1, which it seems you have already done. So it's not the speakers themselves. Next swap #2 only. Then #3 only. Then #4. And lastly #5.
My guess, and it's only a guess, is that commonly with the longer speaker wire run interference has more chance to make its way into the wiring. Especially in wall wiring with power cables in proximity which manifests itself as hum (not hiss or buzz).
Last Edit: Mar 29, 2015 17:18:48 GMT -5 by Gary Cook
(Lounge) Samsung QLED HDR 55" Q95TA, Foxtel IQ3 (cable), Emotiva ERC-3, Emotiva XMC-1, Emotiva XSP-1, 2 x Emotiva XPA-1L's, Emotiva XPA-5, Ascension Summoner 863's & 843's + 263 Centre, SoundStream 17" sub, Emotiva XPA-100 sub amp, Denon DD TT, Sony BD X800 4K, Apple TV4K 120 HZ (Family) Sansum UHD 55" Q60, Foxtel IQ2 (cable), Apple TV4k, Panasonic BD60 (Home Office) MacMini, Emotive Big Ego & Airmotive 4's, Sony 12" Sub (Veranda) Zone 2, XPA-5 x 2 Channels & KEF Chorus
Hum is always a introduction of 60 hz noise from the power. Hiss on the other hand is completely different. I see you have Klipsch; yours are not as sensitive as my Belles but high gain amps do not play well with efficient speakers. I had to ditch the Emo XPA-1s as the floor noise was too high but again you stated HUM not floor noise / hiss.
Where it (60 hz hum) is being fed into your system is the question. Power up the amp with nothing connected to it except the speakers (and power, DUH). Is the hum there?
If still there connect another speaker to the humming output of the amp. If the hum now goes to the previously silent speaker you have an amp issue. If the hum is not present in the previously silent speaker you have a speaker wire issue. In the later case run a new wire across the floor to the surround and check the channel / speaker.
2 Channel: Klipsch Cornwall III, McIntosh C2500 pre-amp, MEN220 Room Perfect, MC2000 amp fed by Oppo BDP-105D and FLAC from Qnap NAS.
HT: McIntosh MX151 controller > MC 8207 amp with Oppo BD-105D, DirecTv DVR and OTA reception as sources and Klipsch Cornwall III. Zones 2 & 3 are AppleTV and 1 terabyte of AIFF music on external drive into the Oppo feeding Emo Mini X-100s. Dual PSA VS30SE subs
Is it possibly a dimmer switch related problem. if any dimmer switches on same line turn off and see if you can still hear hum
Funny enough that's not the issue. And I'll tel you why I know
For some reason today the dimmer started tripping the amps protection. Every time I would fade up or down it would trip it
I then took the amp and put it on a completely different circuit by running an extension cord.
Now it doesn't trip. But the slight hummus still there
Again it is very faint. But loud enough to hear when silent. Also it doesn't get louder when turning up volume.
The hum does jump to other speakers when they are put in the surround outputs of the amp.
Like I said I think I have found the issue. It's the preout on the avr.
Because when it is not connected to the amp either on amp side or avr side. The gym goes away
Guess there isn't much I can do about that
Come to think of it. I never had my surrounds hooked to the amp. Because he way ATMOS and amp assign is setup. I had to run LCR and front top L/R from the xpr. And surrounds and Top rear R/L from the avr. This is the first time using he surround preouts from this avr!