Rm6800

ldi

I have RM6800 and Onkyo TX-LR552 receiver. Here is my questions. Hope someone could answer them:
1. Subwoofer: I used recommended connections from RM6800 manual (Connect to speaker in on sub) and got wierd sound from sub. I read some comments on this forum and changed to use Sub-out on receiver to left Line-in on sub. Wierd sound was gone, but I got humming sound from sub even the switch was on OFF.

2. I'm using 12 gauge wire, which is very thick and could not fit receiver terminal (spring clips) and speakers (binding). I managed to attach connecter pins on the wire and the pin fits both terminal and speaker. However, on receiver side the pins are next to each other and easy to get touched with each other. I'm afraid they may cause short-circuit. I attached a photo of those pins.

3. Should I set speakers to Large or Small?

4. What's the Xover value should set?

Thanks for the advice.

Mike682

1. Is the hum a light hum noise? Or does it sound like a feedback hum?? does it go away when you unplug the sub? I might be a transformer hum which is normal if it's a light hum..

2. If the pins touch, they could cause the receiver to shut-off. The pins should have came with plastic sheaths or covers that go over the pin(s). I would use these as they are designed to prevent shorting/contact.

3. Most people set all speakers to small and send all the lower frequencies to the sub and.. since this is related to #4:

4. Try 80hz for all speakers....the rest (lower freqs) goes to the sub

ldi

Thanks for the reply.
1. Only a light hum noise. It goes away if unpluged.
2. As the photo you saw, there was no plastic covers. Where can I get it?

Mike682 wrote:

1. Is the hum a light hum noise? Or does it sound like a feedback hum?? does it go away when you unplug the sub?

2. If the pins touch, they could cause the receiver to shut-off. The pins should have came with plastic sheaths or covers that go over the pin(s). I would use these as they are designed to prevent shorting/contact.

3. Most people set all speakers to small and send all the lower frequencies to the sub and.. since this is related to #4:

4. Try 80hz for all speakers....the rest (lower freqs) goes to the sub

Mike682

ldi wrote:

Thanks for the reply.
1. Only a light hum noise. It goes away if unpluged.
2. As the photo you saw, there was no plastic covers. Where can I get it?

1. I believe the light hum is normal because of the transformer used to power the amplifier within the sub.

2. Usually, the plugs come packaged with plastic sheaths. I'm not sure where to get 'em by themselves. If you are really nervous, just wrap some electrical tape around the base of the plugs so they don't contact each other.

ldi

Thank you!

nebborjk

ldi,

First, Welcome to the forum.

Second, if I'm reading your post correctly, it looks like you hooked the subwoofer and fronts directly to the AVR. I would not recommend this method with the RM6800 system. I would go back to running the fronts through the sub, fronts set to large and subwoofer off. The reason I suggest this is because I believe the RM6800 Satellites have an internal crossover point of around 150HZ. I used to own the RM6700 system. There are several threads discussing this on the forum. If you can set the crossover on your AVR to 150HZ (or whatever the crossover in the satellite is) you might be OK. I would still go with the Polk Method though because 150HZ is fairly easy to locate in the sound field. An explosion coming from the left shouldn't come from the subwoofer on the right.

I would suggest you invest in a SPL meter and a home theater Set-Up DVD or some test-tones. Again there are many threads on this forum discussing these. Use these and see what way works best. I could be wrong.

Good Luck.

Also, I agree with getting some shielding on those bare connectors.

ldi

Thanks Nebbrojk,
You are right on the connection. Initially I followed the Polk Recommended connections. But I got the unexpected result (strang sound like described here in the Troubleshooting forum:
http://www.polkaudio.com/forums/showthread.php?t=27702&highlight=rm6800
Then I had to switch it by using line-in on sub and front speakes directly from receiver.

Some correction on humming. Actually even after unpluged sub cable, the humming is still there. It stops only when cut off the power supply. Does this sound defect?