Sony dg910 going into Protect Mode

Muckrak3r

I have a Sony DG910 receiver. Up until now I had been running a 6.1 system using all infinity bookshelf speakers, center, and sub.

I got 2 Polk Monitor 50's last week to replace my 2 front speakers and I moved those to the rear to get 7.1 running. Ever since hooking them up my receiver goes into Protect mode and shuts off if I turn the volume up to even mid-high levels. If a scene gets loud, it definitely will shut off. I ended up having to take the M50's out of my setup just so we could finish a blu-ray last night.

I used an ohm meter and tested the same wiring from the receiver end to my 2 front Infinity's and got 6.8 on each. I then put the Polks in there and got 4.0 on each. Is this my problem? Will the M50's not mesh with the rest of my speakers and keep causing the Protect mode issue? I just ordered 100ft of 14 awg speaker wire to replace all of my wiring, and ordered some banana plugs too. I want to eliminate all other possibilities before knowing for 100% sure it's the M50's.

Any tips, suggestions, advice, etc on this issue would be GREATLY appreciated. Thanks!

Knucklehead

Monitor 50's are 8ohm speakers so Im not sure why your reading 4. Make sure your speakers are set to "small" on your AVR. Also, are you running a sub?

Muckrak3r

I have all speakers set to small. I am running a sub through the LFE connection with an rca cable. The problem was happening with my sub turned off, I accidentally unplugged it when I installed the M50's and didn't realize it, and the Protect issue happened.

Knucklehead

so, is it ok now? oh yeah, welcome to Club Polk!

hearingimpared

Welcome to Club Polk.

Muckrak3r

Knucklehead wrote: »

so, is it ok now? oh yeah, welcome to Club Polk!

thanks, and no it's not okay now when I hook up the Monitor 50's it goes into Protect mode still. with my infinity's hooked up on 6.1 I can jack the volume up extremely high and it doesn't go into Protect mode.

Knucklehead

Ok im trying to stay on track here, you said it was happening with the sub off....so...you powered the sub on, and it is still happening....correct?

also, what is your crossover set at on the AVR?

Muckrak3r

Knucklehead wrote: »

Ok im trying to stay on track here, you said it was happening with the sub off....so...you powered the sub on, and it is still happening....correct?

also, what is your crossover set at on the AVR?

with the sub plugged in, or turned off it still happens.

what crossover are you speaking of and how do I check that?

apphd

Muckrak3r welcome to CP you didn't say what Infinity speakers you were running, but I'm going to guess they are some relatively easy speakers to drive same as the M50's. Check all your speaker connections make sure they are tight and you do not have any stray strands of wire shorting out on any. While you have added another speaker to the mix, that Sony should be able to handle the job. You could try running 6.1 using the Polks to try and eliminate the AVR. Also try to do the resistance reading at the speaker with out any speaker wire connected.

Did you buy the Polks new?

Muckrak3r

apphd wrote: »

Muckrak3r welcome to CP you didn't say what Infinity speakers you were running, but I'm going to guess they are some relatively easy speakers to drive same as the M50's. Check all your speaker connections make sure they are tight and you do not have any stray strands of wire shorting out on any. While you have added another speaker to the mix, that Sony should be able to handle the job. You could try running 6.1 using the Polks to try and eliminate the AVR. Also try to do the resistance reading at the speaker with out any speaker wire connected.

Did you buy the Polks new?

1) Infinity Primus are the speakers I'm running - bookshelf speakers that came in a complete set box, 4 surrounds and a center. no model # on them, but they are small bookshelf size.

2) I have double and triple checked my wiring connections. Zero loose connects or stray strands. I even re-connected all of them. Also, I ordered new 14 gauge wire and banana plugs, those will be here next week.

3) I did try 6.1 after getting Protect mode on 7.1 because I was suspecting a wiring run to a rear speaker as bad, and I suspected the rear speaker itself was bad. But after taking that wiring run and speaker out of the mix it still happened with the Polks attached.

4) Great suggestion for the resistance reading directly touching the speaker posts. I am getting the exact same reading on the Polks M50's, 4.0. Does that mean they are defective? I am under the impression they should be reading at 8 ohms? I tested directly on the Primus and got 6.8 (even though the sticker says 8ohms), and I have a pair of real cheap Pioneer bookshelf speakers that don't even have screw down posts, they have the red/black tabs you press down and put the wire inside and the tab clamps down on the wire when you let go. Those read at 8.4ohms!!!

5) Yes I bought them new.

Knucklehead

This is what I would do:

1.remove all speakers from your system.

2. reconnect JUST the Polks..see what happens.

3. Add the center, see what happens.

4. add the rears, see what happens.

I dont think reading ohms at the speaker terminals is an actual reflection of the rating of speaker ohms because you will be reading across the crossover as well as the speaker.
I guess its possible that you could have a bad speaker, but 2 bad speakers, highly unlikely.

As for the crossover setting on your AVR I suggest that you consult your AVR owners manual on those settings. Should be set to 80.

apphd

As KH said you are reading through the XO, also keep in mind you are reading DC resistance, which is different than impedance.

But I have to agree with you that what you are seeing on the 50's sounds low. Maybe someone that has some 50's and an ohm meter can check theirs and report back. But as KH said it's very strange that two new speakers would have the same problem.

I have heard more than a couple stories of older series of Polks kind of having some inconsisdency in components used to build them. But I think that is a thing of the past. Not that mistakes can't happen though, (mislabeled drivers, wrong drivers on the shelf etc). As I said hopefully someone can report on what theirs measure before Monday. If not call (for quicker response) Polk CS on Monday, or if not in a rush email them. Polk monitors the "Troubleshooting" forum so if they see this thread they will respond, but the best thing would be to call, or email them.

Knucklehead

so....whats the verdict?

Muckrak3r

Knuclke,

I'm not going to try the one speaker at a time thing until I get my banana plugs in. It takes too much time, my hands are too big, and the speaker terminals are too close together .

I will update as soon as I try it out. I expect the banana plugs Wed or Thurs.

Again, thanks for all the tips and I will post results shortly.

Apphd,

I emailed Polk Saturday morning. If I don't hear from them by the time I get my wiring and banana plugs in I will definitely give them a call, thanks.

consliu

Thanks for sharing. It's great

wutadumsn23

Reported^^

Muckrak3r

I had to go out of town on an emergency and won't be back until Sunday. Will update on Thursday. Got the banana plugs in already and will have all the new wiring by the time I get back too.

kawizx9r

Hmm......if your room isn't all that 'large' to run a proper 7.1 I'd say omit 2 of those Infinity speakers and just run a properly set up 5.1 Just having all those speakers is very demanding for the AVR's built in amp.

sloplaju

You can visit:
1.remove all speakers from your system.
2. reconnect JUST the Polks..see what happens.
3. Add the center, see what happens.
4. add the rears, see what happens.
I will return this forum.

apphd

slopaju ^^^^Post reported

Muckrak3r

Knucklehead wrote: »

This is what I would do:

1.remove all speakers from your system.

2. reconnect JUST the Polks..see what happens.

3. Add the center, see what happens.

4. add the rears, see what happens.

I dont think reading ohms at the speaker terminals is an actual reflection of the rating of speaker ohms because you will be reading across the crossover as well as the speaker.
I guess its possible that you could have a bad speaker, but 2 bad speakers, highly unlikely.

As for the crossover setting on your AVR I suggest that you consult your AVR owners manual on those settings. Should be set to 80.

Thanks for this advice. I got the new 14 awg speaker wire and banana plugs.

After re-wiring most of the entire system I added the speakers in order as you suggested. I was able to blast the volume with just the polks, and then the center and then the surround R and L speakers giving me a fully functional and LOUD 5.1 system.

I was even able to run the auto calibration setup using the microphone. It would not allow me to do that before. It looks like the wiring itself was the problem. At best it was 16 awg but possibly 18 awg. Also, since I moved into a bigger house 4 years ago I had to add spliced sections so the speakers could reach new distances. I am nearly positive the thin/spliced wiring was the problem.

I am now at 6.1 using original spliced wiring running to one rear speaker because 100 feet of 14 awg wasn't enough so I will have to order some more to run to both surround rear speakers so I can get back up to a 7.1 system.

As of now, after the auto calibration the AVR is reading my speakers as LARGE. I left it that way, and it sounds good and I am able to put the volume up as loud as I want.

Once I get back up to 7.1, if I have any problems I will pop back on here and post an update.

Again, thanks for all the tips guys as they were helpful. Hopefully this issue can help someone else with a similar problem in the future.

apphd

Good to see you got it worked out and are enjoying your gear. The way it should be!:)

wutadumsn23

Good to hear you are back in the game Muck. Enjoy!!

-Jeff