Luxman R-115 Sound Very Quiet on Polk Monitor 10a Speakers

AriusVision

Hello all, I bought what the seller described as a beautiful fully functioning Luxman R-115 off of Ebay.

I am trying to power a pair of Polk Monitor 10a's which worked fine on my last receiver. I just hooked up the receiver to my computer and my Xbox 360 and both ways I can get just very faint sound at max volume level.

I have tried both channels A/B as well as all most of the inputs on the receiver to make sure it just wasn't a faulty input. All produce the same effect, very faint sound.

Anyone have any ideas? Did I get a dud receiver? Thanks in advance.

apphd

How do you have everything connected? From what is posted it sounds like you have a line level output connected to a speaker level input.
But since you had another receiver hooked up, it is doubtful that is it......just saying more detail and someone may be able to help more.

Also is there any chance you have a "mute" function switched on?

Maybe some dirty pots, switches????

AriusVision

The speakers are hooked up through banana plugs to the speaker terminals on the receiver. I hooked up the DVD player's audio to the Phono (red/white) terminals on the back. I am pretty sure it is hooked up properly.

I just realized something! The Polk Monitor 10a's are 4 or 6 ohm speakers and the channel says 8ohm - 16 ohms... I would imagine this is why the receiver can't power these.

I will bridge the receiver and it should work fine.

sucks2beme

AriusVision wrote: »

The speakers are hooked up through banana plugs to the speaker terminals on the receiver. I hooked up the DVD player's audio to the Phono (red/white) terminals on the back. I am pretty sure it is hooked up properly.

I just realized something! The Polk Monitor 10a's are 4 or 6 ohm speakers and the channel says 8ohm - 16 ohms... I would imagine this is why the receiver can't power these.

I will bridge the receiver and it should work fine.

Do not use the phono input for anything but a turntable.
I would think a Luxman would put out more than a faint wisper.
4-6 ohm loads actually pulls MORE power from the system than an 8 ohm.
That could kill the amp, IF it was was outputing any real sound
for a length of time. At low volumes, there's not much danger of that.
I'd clean all the switches. After that, it's tech time.
Given your speakers ratings, if the cleaning works, I'd dump it and go back
to shopping for a Rotel or Nad, etc.

apphd

AriusVision wrote: »

The speakers are hooked up through banana plugs to the speaker terminals on the receiver. I hooked up the DVD player's audio to the Phono (red/white) terminals on the back. I am pretty sure it is hooked up properly.

I just realized something! The Polk Monitor 10a's are 4 or 6 ohm speakers and the channel says 8ohm - 16 ohms... I would imagine this is why the receiver can't power these.

I will bridge the receiver and it should work fine.

As s2bme pointed out only use the phono input for a turntable. TT's put out a lower level signal than the typical line level signal. That requires some amplification before going to the preamp section of the receiver.

Use an AUX, tape, or any other input OTHER than Phono. This may be the only issue, but you need to start there first.

I thought the Monitor 10s were 8 ohm???? Anyway that's not your problem it looks like that receiver is very capable of driving difficult loads.

- 70 watts rms into 8 ohms (150 watts dynamic power into 8 ohms, 210 watts into 4 ohms, 270 watts into 2 ohms).

Try a line level input and report back.

apphd

Those power specs^^^^^^was all I could find in an AudiogoN add so take it for what it's worth. I'm sure if you did some searching around you can verify.

http://www.audiogon.com/cgi-bin/cls.pl?miscrcvr&1255478486

F1nut

As the others said, do not use the phono input for anything other than a TT.

I will bridge the receiver and it should work fine.

No, it will not. That's the last thing you'd want to do driving 4/6 ohm speakers, if in fact, you can bridge that receiver.

ViperZ

Trying to drive the 4-Ohm speakers with the receiver not capable of driving the low-impedance speakers will most likely damage the amplifier section. Also as other people said, don't bridge the receiver (even if you can do that).

Also, make sure that your 'tape monitor' or 'mute' or similar buttons are not pushed in.

zeppage2

make sure the signal processor switch on the back is turned off

pm me if you want an upload of the manual

zeppage2

i presume the sig proc switch proved to be the culprit? I have bumped the switch before and muted the output...

AriusVision

Thanks for all the replies.

I'm still having problems unfortunately.

The signal processor switch is turned to Off, I have the CD line being used and have the A channel of speakers in use.

I can now hear the music but it is very intermittent, it cuts in and out, the volume is fine, but after about 15 seconds it just stops playing.

The strange thing is that when I plug in the cables and had them bridged on the receiver it was working fine no problems at all. But now that I changed back to just one channel it is not working.

I'm not an expert, but when they were bridged I did this.
Red terminal on the back of the Polk Monitor 10 was connected to the Red Left channels both A/B. Then the black terminal on the back of the Polk Monitor 10 was connected to the Black Left Channels on both Channels A/B.

I then did the same thing for the Right side speakers. It worked fine like normal, no noticeable heat build up on the Receiver.

I might go back to doing that if I can't get it to work normally. And another thing I noticed when I had the speakers connected normally not bridged was that only one channel worked...and it cut in and out. But when I plugged the cables into separate channels, the sound came fine from both.

Any help greatly appreciated.

F1nut

The strange thing is that when I plug in the cables and had them bridged on the receiver it was working fine no problems at all. But now that I changed back to just one channel it is not working.

I'm not an expert, but when they were bridged I did this.
Red terminal on the back of the Polk Monitor 10 was connected to the Red Left channels both A/B. Then the black terminal on the back of the Polk Monitor 10 was connected to the Black Left Channels on both Channels A/B.

I then did the same thing for the Right side speakers. It worked fine like normal, no noticeable heat build up on the Receiver.

I can't think what to call that off the top of my head, but it most definitely not bridging.

It's obvious that your receiver has issues. Take it to a repair shop.

AudioGenics

suggest to buy locally and support your local business folks and community.
get to know a qualified and certified technician that you can count on when
having a question or issue.

eBAY.... "Buyer Beware". do not expect any level of service or response !

apphd

Try hooking up the speakers to just the B speaker outs and select the B only on the receiver. If I understood your Op you did try this but lets start over from your last post and take it a step at a time.

trusumclo

Thanks for sharing. It's great

vc69

reported. ^^^

zeppage2

someone asked for a copy of the manual. its available at

http://tech.groups.yahoo.com/group/luxman/