Right channel comes through both left and right speakers
headrott
Posts: 5,496
OK, I will try to make this as clear as I can. I recieved a Luxman M-117 amp today that I won on ebay 3 days ago. In the description the seller said it "worked fine". When I recieved the amp it was well packed, and when I pulled it out it appeared in better shape than I expected. I unhooked my tube amp (which was working perfectly along with all other equipment doing the same) and proceeded to hook up the Luxman in its place. Let me point out that I absolutely 100% hooked up the Luxman correctly in all aspects of wire hookups. I.e: speaker polarity, IC left-right on both CD to Pre, pre to amp. Hooked up the power to the Monster cable 3500 MKII power conditioner (which is hooked up to the Monster voltage conditioner).
Anyway, I turned everthing on and the first thing I noticed was that there was very high impedence on the left channel when I switch the pre-amp from the "headphones" setting to the speaker output setting, as was evident with a loud "thud". I was immediately not liking what I heard. I proceeded to turn the volume knob up and down a few times and then set the volume knob to about 1/8 of the way up. I pressed play on the CD player and heard "Always crashing in the same car" start. I noticed something was wierd immediately as some of the instruments were missing. There was audio comming out of both speakers, but it was only being produced by the right channel. My question is, does anyone know what (in the amp) would cause this problem?
As I stated before I know it's not my other equipment (such as CD player, Pre-amp, cables, power conditioner, voltage regulator) as I hooked up my tube amp again and everything worked fine. It has to be something with the amp, (it's not the RCA inputs as I hooked up the inputs to the "fixed" and then the "variable" with the same results. The variable I turned down both variable knobs all the way and turned them up individually, resulting in sound coming from the right channel with the balance equal, but when I u=turned the right variable down and the left up, nothing. If someone could help me out in diagnosing the problem (without opening the amp) I'd appreciate it. Thanks for your time and help.
Anyway, I turned everthing on and the first thing I noticed was that there was very high impedence on the left channel when I switch the pre-amp from the "headphones" setting to the speaker output setting, as was evident with a loud "thud". I was immediately not liking what I heard. I proceeded to turn the volume knob up and down a few times and then set the volume knob to about 1/8 of the way up. I pressed play on the CD player and heard "Always crashing in the same car" start. I noticed something was wierd immediately as some of the instruments were missing. There was audio comming out of both speakers, but it was only being produced by the right channel. My question is, does anyone know what (in the amp) would cause this problem?
As I stated before I know it's not my other equipment (such as CD player, Pre-amp, cables, power conditioner, voltage regulator) as I hooked up my tube amp again and everything worked fine. It has to be something with the amp, (it's not the RCA inputs as I hooked up the inputs to the "fixed" and then the "variable" with the same results. The variable I turned down both variable knobs all the way and turned them up individually, resulting in sound coming from the right channel with the balance equal, but when I u=turned the right variable down and the left up, nothing. If someone could help me out in diagnosing the problem (without opening the amp) I'd appreciate it. Thanks for your time and help.
Taken from a recent Audioholics reply regarding "Club Polk" and Polk speakers:
"I'm yet to hear a Polk speaker that merits more than a sentence and 60 seconds discussion."
![:\](https://forum.polkaudio.com/resources/emoji/confused.png ":\"){kind=small}
My response is: If you need 60 seconds to respond in one sentence, you probably should't be evaluating Polk speakers.....
"Green leaves reveal the heart spoken Khatru"- Jon Anderson
"Have A Little Faith! And Everything You'll Face, Will Jump From Out Right On Into Place! Yeah! Take A Little Time! And Everything You'll Find, Will Move From Gloom Right On Into Shine!"- Arthur Lee
Post edited by headrott on
Comments
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Hmm, only thing I can think of, is there a mono/stereo switch on the amp? If it's on mono, it might do something similar. If not, it sounds like there is something wrong with the amp, or it's been modified. If you open it, I'd be curious if you saw any mod work don in there.
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Hmm, only thing I can think of, is there a mono/stereo switch on the amp? If it's on mono, it might do something similar. If not, it sounds like there is something wrong with the amp, or it's been modified. If you open it, I'd be curious if you saw any mod work don in there.
It does have a mono/stereo switch. But, the switch still has the "protective cover" on it making it hard to switch it to the mono output (i.e. it's on the stereo setting). Unless something with the wiring on the inside is screwed up, It's definately not that. Thanks for the suggestion though.
Taken from a recent Audioholics reply regarding "Club Polk" and Polk speakers:
"I'm yet to hear a Polk speaker that merits more than a sentence and 60 seconds discussion."
My response is: If you need 60 seconds to respond in one sentence, you probably should't be evaluating Polk speakers.....
"Green leaves reveal the heart spoken Khatru"- Jon Anderson
"Have A Little Faith! And Everything You'll Face, Will Jump From Out Right On Into Place! Yeah! Take A Little Time! And Everything You'll Find, Will Move From Gloom Right On Into Shine!"- Arthur Lee -
Hello,
Sometimes when I have a problem to figure out I go about it from the unwanted results backwards. In other words, I try to think how I could make what is happening happen if I wanted to. In your case, how could I get the right audio channel to come from both speakers if, for some reason, I wanted this? A few facts are needed. Does the Luxman have more than one set of speaker connections? I believe the "stereo/mono" selector, you mention, is for bridged operation, correct?
Regards, Ken -
Is the amp in the bridged mode? This optional switch is in the back.
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Hi,
Maybe both speaker wires hooked up to the right channel on a a/b type hook up?
Just a thought. When i get new stuff, I am usally excited and prone to doing little mistakes.
Jim -
Are you using the fixed inputs or the variable inputs?
I have used both the fixed and variable outputs on the amp. The first ones I tried were the fixed. I then tried the variable, and turned the gain "knobs" up and down for both the left and right channels. The right channel gain "knob" outputs sound when turned up (but to both the left speaker and right speakers), the left ouputs nothing (to either speaker) when tured up and down.
Taken from a recent Audioholics reply regarding "Club Polk" and Polk speakers:
"I'm yet to hear a Polk speaker that merits more than a sentence and 60 seconds discussion."
My response is: If you need 60 seconds to respond in one sentence, you probably should't be evaluating Polk speakers.....
"Green leaves reveal the heart spoken Khatru"- Jon Anderson
"Have A Little Faith! And Everything You'll Face, Will Jump From Out Right On Into Place! Yeah! Take A Little Time! And Everything You'll Find, Will Move From Gloom Right On Into Shine!"- Arthur Lee -
Jed Leland wrote: »Hello,
Sometimes when I have a problem to figure out I go about it from the unwanted results backwards. In other words, I try to think how I could make what is happening happen if I wanted to. In your case, how could I get the right audio channel to come from both speakers if, for some reason, I wanted this? A few facts are needed. Does the Luxman have more than one set of speaker connections? I believe the "stereo/mono" selector, you mention, is for bridged operation, correct?
Regards, Ken
Hi Ken,
The Luxman is not bi-wirable. It only has two sets of speaker terminals (left/right) and for bridged mode you would not used the ground terminals, but only the positive. Yes it is for a bridged mode (which it seems to be acting like it is in bridged mode) except the indicator light (BTL light) is not on, and the switch is in stereo mode with the locking nut in place, making it very hard to switch it to bridged mode, unless the switch is bad.
Taken from a recent Audioholics reply regarding "Club Polk" and Polk speakers:
"I'm yet to hear a Polk speaker that merits more than a sentence and 60 seconds discussion."
My response is: If you need 60 seconds to respond in one sentence, you probably should't be evaluating Polk speakers.....
"Green leaves reveal the heart spoken Khatru"- Jon Anderson
"Have A Little Faith! And Everything You'll Face, Will Jump From Out Right On Into Place! Yeah! Take A Little Time! And Everything You'll Find, Will Move From Gloom Right On Into Shine!"- Arthur Lee -
[QUOTE=.
. making it very hard to switch it to bridged mode, unless the switch is bad.[/QUOTE]
Maybe it's time to open it up and check? -
Hello,
I agree with the other members, the amp seems to be in the bridged mode. That would be the most likely explanation that could cause the result. It "thinks" you want it to only produce a single audio signal. A test would be to try connecting one of your speakers to the left and right positive terminals on the amp. If this produces sound then the amp is functioning in the bridged mode.
Merry Christmas, Ken! -
OK, it's definately not in bridged mode.
Get this, the gain adjustment for the right channel affects the output while the "fixed" inputs are being used. The left does nothing, but the right gain adjustment affects the fixed output. So, I was incorrect I think about only the right channel being output to both speakers. It's almost like it's in mono, but the right channel is a little louder than the left. I don't know if that means it is grounding out or cross-wired between the variable and fixed inputs? It makes sense while it would be doing that, but my brain is not working well enough think of why it's doing that right now. Please help me out if you can. Thanks again.
Taken from a recent Audioholics reply regarding "Club Polk" and Polk speakers:
"I'm yet to hear a Polk speaker that merits more than a sentence and 60 seconds discussion."
My response is: If you need 60 seconds to respond in one sentence, you probably should't be evaluating Polk speakers.....
"Green leaves reveal the heart spoken Khatru"- Jon Anderson
"Have A Little Faith! And Everything You'll Face, Will Jump From Out Right On Into Place! Yeah! Take A Little Time! And Everything You'll Find, Will Move From Gloom Right On Into Shine!"- Arthur Lee -
OK, it's definately not in bridged mode.
Get this, the gain adjustment for the right channel affects the output while the "fixed" inputs are being used. The left does nothing, but the right gain adjustment affects the fixed output. So, I was incorrect I think about only the right channel being output to both speakers. It's almost like it's in mono, but the right channel is a little louder than the left. I don't know if that means it is grounding out or cross-wired between the variable and fixed inputs? It makes sense while it would be doing that, but my brain is not working well enough think of why it's doing that right now. Please help me out if you can. Thanks again.
Actually, I shouldn't say it is definately not in bridged mode, but the switch is definatelt not in bridged mode if that makes sense.
Taken from a recent Audioholics reply regarding "Club Polk" and Polk speakers:
"I'm yet to hear a Polk speaker that merits more than a sentence and 60 seconds discussion."
My response is: If you need 60 seconds to respond in one sentence, you probably should't be evaluating Polk speakers.....
"Green leaves reveal the heart spoken Khatru"- Jon Anderson
"Have A Little Faith! And Everything You'll Face, Will Jump From Out Right On Into Place! Yeah! Take A Little Time! And Everything You'll Find, Will Move From Gloom Right On Into Shine!"- Arthur Lee -
move the stereo/mono switch in the other position and see what happens.. even if it has a cover on it.. i think the swich may be bad.. give it a try and report back.PolkFest 2012, who's going>?
Vancouver, Canada Sept 30th, 2012 - Madonna concert :cheesygrin: -
It still doesn't make sense that the gain adjustment would affect the output lever when the fixed RCA jacks are hooked up. Even if it is in bridged mode, this shouldn't happen should it?
I did notice on the back that the left gain "knob" controls the gain in bridged mode. But, the left gain knob does nothing when the variable and the fixed RCA jacks are hooked up. On the other hand, the right gain knob affects the gain through BOTH the fixed AND variable RCA inputs.
Still need to figure out why this would happen.
I will try to switch the bridged/stereo switch to the other setting though and will report back.
Taken from a recent Audioholics reply regarding "Club Polk" and Polk speakers:
"I'm yet to hear a Polk speaker that merits more than a sentence and 60 seconds discussion."
My response is: If you need 60 seconds to respond in one sentence, you probably should't be evaluating Polk speakers.....
"Green leaves reveal the heart spoken Khatru"- Jon Anderson
"Have A Little Faith! And Everything You'll Face, Will Jump From Out Right On Into Place! Yeah! Take A Little Time! And Everything You'll Find, Will Move From Gloom Right On Into Shine!"- Arthur Lee -
http://www.polkaudio.com/forums/showpost.php?p=1230375&postcount=31
Tip: It's never a good idea to post the same thread in different sections.Political Correctness'.........defined
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President of Club Polk
