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post #271 of 3609 Old 11-20-2009, 03:21 PM
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Originally Posted by Jon SS View Post

You mention that yours is not under warranty, does the warranty not transfer as it is 10 years which is longer than the unit has been out?


Tony asked me to give the serial number, and also whether I had bought it new; after which I was told that service would cost money. I had assumed going in that the warranty was not transferrable, but never actually checked. Based on the response from Parasound, I can only assume it is not.
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post #272 of 3609 Old 11-20-2009, 03:25 PM
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Originally Posted by Jon SS View Post

....
You mention that yours is not under warranty, does the warranty not transfer as it is 10 years which is longer than the unit has been out?

The Parasound warranties are to the original owner only. They are not transferable.

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post #273 of 3609 Old 11-30-2009, 06:49 AM
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Guys, I need some advice I currently have an A21 amplifier and P3 preamp combo that has worked wonders for my 2 channel audio setup. I just purchased (for a different room) an A51 amp with a P7 preamp to be used in conjunction with an Onkyo 705 receiver as a pre-pro. The goal here was to use the A51/P7/Onkyo for an HT setup (using the analog pass-through) and the A51/P7/audio analog sources for a separate 2 ch audio setup. Well, so far this is a disaster. As soon as I finished setting everything up (balanced connectors between the P7 and the A51 by the way), there was a huge hum/buzz coming from all the speakers using the P7 analog pass-through function. To make mattersworse, the on/off button on the P7 does not work. The unit only responds to the remote control. So I took out the P7 and connected the Onkyo directly to the A51, which lessened the hum considerably - now it is only audible if I get close to the speakers. The ground lift switch on the A51 also did not do anything and all my components are on a dedicated circuit. So here are my questions:

1) Assuming the P7 is defective (given the malfunctioning on/off button), could the large hum be simply a result of the defective unit

2) There is still a hum coming out of the A51 (albeit not as bad) when only used in conjunction with the Onkyo receiver, is that normal? I know some amps can be subject to a hum sometimes caused by a ground loop. I should note that my A21 used with my P3 barely produces any hum at all.

3) Is there any chance that the defective P7 somehow damaged the A51 by simply being connected to it? That would cause me to return the A51 as well.

Sorry for the rambling but I have to decide whether I should return both units or keep the A51 and forget about the P7 for now. Thanks for any feedback.
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post #274 of 3609 Old 11-30-2009, 07:29 AM
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Call either your dealer, Parasound service, or Audio Advisor if you bought there.

My P7/A52 combo is dead silent, and I also have a Nuforce AVP17 hooked up to them in conjunction with a Dish DVR.

Clearly, you have a defective unit/units, or something is hooked up wrong. could the Onkyo be the culprit?

Good luck.

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post #275 of 3609 Old 11-30-2009, 07:38 AM
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Originally Posted by moonhawk View Post

Call either your dealer, Parasound service, or Audio Advisor if you bought there.

My P7/A52 combo is dead silent, and I also have a Nuforce AVP17 hooked up to them in conjunction with a Dish DVR.

Clearly, you have a defective unit/units, or something is hooked up wrong. could the Onkyo be the culprit?

Good luck.

Thanks for the help. I will call both Parasound and AA (I bought both units there). I doubt the Onkyo is the culprit as I get absolutely zero hum when it's driving the speakers by itself (have been doing so for two years). I also triple checked the connections. What frustrates me is while the P7 is clearly defective, I'm not even sure the A51 is fine at this point...This is painful...
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post #276 of 3609 Old 11-30-2009, 08:44 AM
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Originally Posted by KB1 View Post

Thanks for the help. I will call both Parasound and AA (I bought both units there). I doubt the Onkyo is the culprit as I get absolutely zero hum when it's driving the speakers by itself (have been doing so for two years). I also triple checked the connections. What frustrates me is while the P7 is clearly defective, I'm not even sure the A51 is fine at this point...This is painful...

KB1,

Have you tried disconnecting the preouts from the 705 to the A51 to see if you still get the hum? Do you have a sub connected to the 705? If you do you could try disconnecting the LFE cable to the 705 to eliminate that. Also do you have a cable/SAT box connected to the 705? If you do you could try disconnecting that as well.

The P7 definitely sounds defective (power button) so I would call AA and setup a exchange. They are great to deal with so it should not be a problem.

Bill

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post #277 of 3609 Old 11-30-2009, 10:44 AM
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Originally Posted by Bill Mac View Post

KB1,

Have you tried disconnecting the preouts from the 705 to the A51 to see if you still get the hum? Do you have a sub connected to the 705? If you do you could try disconnecting the LFE cable to the 705 to eliminate that. Also do you have a cable/SAT box connected to the 705? If you do you could try disconnecting that as well.

The P7 definitely sounds defective (power button) so I would call AA and setup a exchange. They are great to deal with so it should not be a problem.

Bill

Thx for all the helpful suggestions. I called Parasound today and the P7 is definitely defective given the failed power button, there is no way to disable it with any settings. That said, I'm still scratching my head about the hum. Yes, I have all three connections! The LFE cable to the Onkyo for the subwoofer, the cable box to the Onkyo via an HDMI cable, and the Onkyo has to be connected either to the P7 or to the A51 directly (if I remove the P7) via its pre-out terminals. There is no way to connect the receiver to the amp otherwise. So if a ground loop is being generated from these components, I am not sure what do do given that I need them all...
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post #278 of 3609 Old 11-30-2009, 11:18 AM
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KB1: Not to state the obvious, but are you using shielded interconnects? Finding the cause of a ground loop is a major pain, but is just a process of eliminating item by item. Your best bet is to disconnect everything but the speakers and the amps. See if you still have it. Then start connecting item by item. In the long run, you will save time by starting from the beginning.

I have Parasound HALO amps with extremely efficient speakers (Klipschorns) and there is not hum at all. If I conntect to the amps via the balanced connections, I will get a slight 'hiss' due to the 6dB boost in the balanced section. So, I use RCA connections with good shielded cables.

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post #279 of 3609 Old 11-30-2009, 11:51 AM
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Originally Posted by Rudy81 View Post

KB1: Not to state the obvious, but are you using shielded interconnects? Finding the cause of a ground loop is a major pain, but is just a process of eliminating item by item. Your best bet is to disconnect everything but the speakers and the amps. See if you still have it. Then start connecting item by item. In the long run, you will save time by starting from the beginning.

I have Parasound HALO amps with extremely efficient speakers (Klipschorns) and there is not hum at all. If I conntect to the amps via the balanced connections, I will get a slight 'hiss' due to the 6dB boost in the balanced section. So, I use RCA connections with good shielded cables.

Yes, my interconnects are definitely shielded but I can try different cables and see if that helps. The hum is also definitely much lower when the A51 is connected with RCA connectors (directly to the Onkyo, the only way) than with balanced connectors (through the P7). It is very useful to know that you do not have any hum when the amp is only connected to the speakers and nothing else. Ironically, that's about the only thing I did not try so that's ny mext assignment. Again, thanks for the help. I'm trying not to return the A51 if I don't have to, it is huge!
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post #280 of 3609 Old 11-30-2009, 11:59 AM
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Quote:
Originally Posted by KB1 View Post

Yes, my interconnects are definitely shielded but I can try different cables and see if that helps. The hum is also definitely much lower when the A51 is connected with RCA connectors (directly to the Onkyo, the only way) than with balanced connectors (through the P7). It is very useful to know that you do not have any hum when the amp is only connected to the speakers and nothing else. Ironically, that's about the only thing I did not try so that's ny mext assignment. Again, thanks for the help. I'm trying not to return the A51 if I don't have to, it is huge!

Do you happen to have a Cable Box connected somehow? I had a ground loop problem with my SA8300HD DVR, which I solved by running the coax cables through a power conditioner. If you have a cable box, try unplugging the coax cable...
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post #281 of 3609 Old 11-30-2009, 12:02 PM
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KB1: Just FYI, if you use any balanced cables, you will boost whatever signal is there - hum, hiss or otherwise - by about 6 dB. The balanced section of the Parasound gear is not 'truly' balanced. It is only added onto the unbalanced section. I don't recall why the 6dB boost is there, I just know it is there from way back when I dealt with Parasound trying to figure out why my C2 would 'hiss' much louder on my speakers when using balanced vs. unbalanced cables.

You might also try to connect all your gear from an outlet on a different circuit than what you have been using. Use a long extension cord just to run the tests. Also, make sure you don't have any flourecent lights or cheap dimmers in the circuit you are using. Just some ideas of the various things I recall causing possible line noise.

Be patient and keep a log of what you have done. As you get tired, you will forget what you have and have not done. At least that is what happens to me.

Best of luck.

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post #282 of 3609 Old 11-30-2009, 12:03 PM
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Quote:
Originally Posted by Bill Mac View Post

KB1,

Have you tried disconnecting the preouts from the 705 to the A51 to see if you still get the hum? Do you have a sub connected to the 705? If you do you could try disconnecting the LFE cable to the 705 to eliminate that. Also do you have a cable/SAT box connected to the 705? If you do you could try disconnecting that as well.
Bill

he
I'll second that thought. I can't check my system, as its dismantled for moving. But if I just had my avr connected, w/o the power amp, I'd get a hum through all speakers depending on which way the LFE/normal switches on the subs were set to. I'm thinking it was the LFE setting.
Strangely, with the HCA 2205 amp in the system, there would be no hum either way.
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post #283 of 3609 Old 11-30-2009, 12:09 PM
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I would definately disconnect any subwoofer from the system until I had the issue fixed. I recently was adding a new sub to my system and got a terrible hum when I hooked it up. It turns out I was using an cheap, but long, RCA wire to connect the sub temporarily. Once I got rid of that cable and used a double shielded cable, the hum went away.

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post #284 of 3609 Old 11-30-2009, 12:45 PM
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Thx guys, I will try all these suggestions one by one. What is weird to me is if I connect the Onkyo as a full fledged receiver to the speakers directly, so no P7 or A51 in the chain, I get absolutely zero hum...So something is going on between the A51 and the Onkyo and the hum got even more magnified when the P7 was inserted into the chain using balanced connections, probably due to the + 6db that Rudy81 mentioned. My main concern is to make sure that the A51 if fine, I have to admit I am feeling paranoid given the defective P7, which really surprised me.
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post #285 of 3609 Old 11-30-2009, 03:08 PM
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The good thing is that Parasound has always been very customer oriented and very helpful. I have had nothing but good luck with my Parasound gear. Way back when I did have an issue with my C2 and Parasound stepped right up and took care of me.

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post #286 of 3609 Old 11-30-2009, 04:46 PM
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Originally Posted by Jmouse007 View Post

I have a question, I am looking at using Parasound Halo 21 2.1 amp with my Def Tec 7001 main speakers and Parasound Halo A51 5.1 amp for my C/L/R 2002 center and 4 BPVX surrounds. Anyone using these amps with Definitive Technology Speakers? I auditioned the amps today (more detailed than the Anthem amps I also checked out) but did not have access to Def Tec speakers. Any feedback would be appreciated. Thanks in advance.

UPDATE:

Hi guys, thanks for all of your input. FYI I decided to go with the Parasound Halo A51 5.1 amp with my Def Tec 7001 main speakers, my C/L/R 2002 center and 4 BPVX surrounds. I went with the Parasound Halo A23 2.1 amp for the front ambient height speakers because they do not draw nearly as much current as everything else and the signals that are fed to them carry a lot less information.

For my rack I ended up going with a VTI BLG 404-13 in black with black shelves = 13" 9" 9" and a 7" shelf configuration (This set up includes an additional 9 inch shelf). You can see an example of what I bought here:

http://www.avsforum.com/avs-vb/showt...4#post17272154

This AVS member has the exact same Parasound amps that I own and the 13" bottom shelf on the rack can handle the height, width and DEPTH of both Parasound amps (the depth of the A51 along with the total weight of both these amps combined were a big reason behind the rack choice. Boy was picking the right rack for this particular set of equipment an agonizing process... groan.

I am pairing the Parasounds with a ONKYO PR-SC5507 pre-pro that has been ordered:

http://www.onkyopro.com/model.cfm?m=...eamplifier&p=i

As for XLR cables, I ordered 7 (seven) 1meter Emotiva X-Series Balanced XLR Cables:

http://emotiva.com/xcables.shtm

I guess the only question I have left that needs answering is this: Do I need 2 RCA LFE subwoofer cables? Will they make a serious difference with my Def Tec 7001SC's or not? I am thinking about these as a possibility if they are needed:

Blue Jeans Cable LC-1 Analog Audio Cable:

http://www.bluejeanscable.com/store/subwoofer/index.htm

but I need feedback from Parasound, ONKYO PR-SC5507 and Def-Tec owners as to if this will make a huge or noticeable difference or not. I look forward to hearing from you folks and thanks again to the entire AVS forum and the members on this board, we could not have done any of this or created our front projector and screen home theater set up without your help, support AND invaluable advice.

Well, what do you think of this set up and my equipment choices?

I have never heard TRUE HD or DTS HD and am really looking forward to having an audio system that does justice to our SONY VPL-VW60 pj, our SONY BDP-S550 bluray player and our 100" STEWART Firehawk SST retractable electriscreen.
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post #287 of 3609 Old 11-30-2009, 07:14 PM
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Originally Posted by Jmouse007 View Post

I guess the only question I have left that needs answering is this: Do I need 2 RCA LFE subwoofer cables? Will they make a serious difference with my Def Tec 7001SC's or not? I am thinking about these as a possibility if they are needed

Let the cable-topic begin... You can't go wrong with BJC, so I would give you the thumbs up. Does your sub accept XLR?
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post #288 of 3609 Old 11-30-2009, 09:18 PM
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Let the cable-topic begin... You can't go wrong with BJC, so I would give you the thumbs up. Does your sub accept XLR?

No, the 7001SC def tecs do not have XLR connections and I just heard back from other Def Tec 7001SC owners. There has been a running debate on this very issue: to LFE or not LFE, and after many months and lots of testing the consensus is these particular speakers sound better without hooking up the LFE so I guess I have just saved myself some money for NOW. This hobby of looking for the perfect AV set up is an addiction that never ends
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post #289 of 3609 Old 12-01-2009, 06:41 AM
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Originally Posted by Jmouse007 View Post

UPDATE:

Hi guys, thanks for all of your input. FYI I decided to go with the Parasound Halo A51 5.1 amp with my Def Tec 7001 main speakers, my C/L/R 2002 center and 4 BPVX surrounds.

How do you get 7 speakers out of a 5 channel amp?

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post #290 of 3609 Old 12-01-2009, 08:05 AM
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Originally Posted by moonhawk View Post

How do you get 7 speakers out of a 5 channel amp?

If you read my post you would see that I also have a Parasound Halo A23 that is just powering the ambient height speakers... that is how I get to 7 speakers.
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post #291 of 3609 Old 12-01-2009, 08:56 AM
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Quote:
Originally Posted by KB1 View Post

Guys, I need some advice I currently have an A21 amplifier and P3 preamp combo that has worked wonders for my 2 channel audio setup. I just purchased (for a different room) an A51 amp with a P7 preamp to be used in conjunction with an Onkyo 705 receiver as a pre-pro. The goal here was to use the A51/P7/Onkyo for an HT setup (using the analog pass-through) and the A51/P7/audio analog sources for a separate 2 ch audio setup. Well, so far this is a disaster. As soon as I finished setting everything up (balanced connectors between the P7 and the A51 by the way), there was a huge hum/buzz coming from all the speakers using the P7 analog pass-through function. To make mattersworse, the on/off button on the P7 does not work. The unit only responds to the remote control. So I took out the P7 and connected the Onkyo directly to the A51, which lessened the hum considerably - now it is only audible if I get close to the speakers. The ground lift switch on the A51 also did not do anything and all my components are on a dedicated circuit. So here are my questions:

1) Assuming the P7 is defective (given the malfunctioning on/off button), could the large hum be simply a result of the defective unit

2) There is still a hum coming out of the A51 (albeit not as bad) when only used in conjunction with the Onkyo receiver, is that normal? I know some amps can be subject to a hum sometimes caused by a ground loop. I should note that my A21 used with my P3 barely produces any hum at all.

3) Is there any chance that the defective P7 somehow damaged the A51 by simply being connected to it? That would cause me to return the A51 as well.

Sorry for the rambling but I have to decide whether I should return both units or keep the A51 and forget about the P7 for now. Thanks for any feedback.

Hello,
I have owned and still own dozens of different Parasound Amplifiers and Preamps. With the Amplifiers, 94% of the time, I have had to lift the ground (use a cheater plug) to eliminate ground loops.

In the Stereophile review of the HCA-3500, the reviewers were having ground loop issues as well. They actually got tech support from James Tanner from Bryston to rectify the problem. That involved some minor surgery.

While have issues with lifting the ground, it really does seem to solve the insidious problem of hum 9 times out of 10.
Cheers,
AD

Radio Shack SPL Meter Owner
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post #292 of 3609 Old 12-01-2009, 12:10 PM
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Originally Posted by Jmouse007 View Post

If you read my post you would see that I also have a Parasound Halo A23 that is just powering the ambient height speakers... that is how I get to 7 speakers.

I did read that--thought your 5.1 was doing L/C/R plus 4 surrounds--like you said ("... Parasound Halo A51 5.1 amp with my Def Tec 7001 main speakers, my C/L/R 2002 center and 4 BPVX surrounds..')--and the A23 was doing the height channels. (9 speakers total.) I guess you meant the heights were two of the four surrounds.

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post #293 of 3609 Old 12-01-2009, 12:51 PM
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Hi Parasounders! Just found this thread.
Coincidentally, I just realized my A23 is not playing its left channel nearly as loudly as the right; and yes both volume controls are all the way up.
Any ideas toward a fix without sending out for repair?
Neither of the fault lights are anything but blue and it is not my preamp's fault.

I would like to follow up on this post. I sent my amp out with a pleading message to a shop that told me that it had no problems, but kept it and "continued to test it" for about two months. Ultimately, they did not do anything.

Since I got it back, I backed its volume down to the THX marks. My preamp is boosting its levels considerably and I now have to go to -15 to achieve levels that used to be -25. Aside from that, all seems well.
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post #294 of 3609 Old 12-04-2009, 08:47 AM
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Originally Posted by Jmouse007 View Post

If you read my post you would see that I also have a Parasound Halo A23 that is just powering the ambient height speakers... that is how I get to 7 speakers.

I have a Halo A23 for rear and A51 for main/side/center but I'm also considering a 9.1 (DPLIIz) setup... What to do? Add another A23 or replace the A23 with a A52 and leave one channel unused? I'm leaning towards the A52...
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post #295 of 3609 Old 12-04-2009, 08:47 AM
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Originally Posted by KB1 View Post

Thx guys, I will try all these suggestions one by one. What is weird to me is if I connect the Onkyo as a full fledged receiver to the speakers directly, so no P7 or A51 in the chain, I get absolutely zero hum...So something is going on between the A51 and the Onkyo and the hum got even more magnified when the P7 was inserted into the chain using balanced connections, probably due to the + 6db that Rudy81 mentioned. My main concern is to make sure that the A51 if fine, I have to admit I am feeling paranoid given the defective P7, which really surprised me.

How did it go?
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post #296 of 3609 Old 12-04-2009, 09:03 AM
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I have a Halo A23 for rear and A51 for main/side/center but I'm also considering a 9.1 (DPLIIz) setup... What to do? Add another A23 or replace the A23 with a A52 and leave one channel unused? I'm leaning towards the A52...

Could you bi-amp your center with the a52? That would solve your unused channel.
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post #297 of 3609 Old 12-04-2009, 09:52 AM
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Originally Posted by exm View Post

I have a Halo A23 for rear and A51 for main/side/center but I'm also considering a 9.1 (DPLIIz) setup... What to do? Add another A23 or replace the A23 with a A52 and leave one channel unused? I'm leaning towards the A52...

It may just end up being a cost vs rack space decision.
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post #298 of 3609 Old 12-04-2009, 02:10 PM
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Quote:
Originally Posted by exm View Post

I have a Halo A23 for rear and A51 for main/side/center but I'm also considering a 9.1 (DPLIIz) setup... What to do? Add another A23 or replace the A23 with a A52 and leave one channel unused? I'm leaning towards the A52...

Decisions, decisions... It is your nickle but adding another A23 would cost a lot less (and take up less space and weight) than forking out the money for an A52. That said, all of your choices are good ones; the Halo series is exceptional. I think 125 wpc would be more than enough juice for the front ambient height speakers and rear surrounds.

By the way, how do you like your A51/A23 set up, how does it sound? I have the exact same Halo amps but have been waiting for our new ONKYO PR-SC5507p to arrive (Lord willing Monday Dec 7th... Pearl Harbor day) before setting them up. They have been in their boxes for a month I couldn't do anything until the new rack and pre-pro get here.
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post #299 of 3609 Old 12-10-2009, 01:30 PM
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Originally Posted by exm View Post

How did it go?

Still working on it, painful...I bought a Jensen Isolator for my coax cable line that I will try over the weekend. Truth is I never felt that one component alone clearly added to the hum but by the time I reconnected everything the hum was definitely louder...Changing my RCA cables to BJC did help though, the hum is slight now but noticeable at a close range. The P7 just amplified the heck out of it at the time given the balanced connections I think. I returned that unit in any event as the on/off button was defective and kept the A51. Irrespective of a ground loop hum, do you hear a slight transformer noise coming out of your speakers from your amp? Seems that the A51 does produce a slight noise (only noticeable at a very close range to the speakers in my case). Without anything attached other than the speakers, I do still hear a slight noise with my ear against the speaker grille, not a hiss but more of a slight transformer noise, is that normal?
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post #300 of 3609 Old 12-10-2009, 02:04 PM
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KB1:

Sorry to hear about your hum problem. I sure do not want to make you feel any worse, but I just got a P7 and A51. I can not hear any hum or anything, dead quite. I hate to hear about your troubles. I am sure if you keep working on it you will find the problem.
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