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post #3061 of 3606 Old 02-23-2014, 05:16 PM
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Originally Posted by RichB View Post

I also went with the A51 to drive the Salons, Voice, and Studio and it does so wonderfully.

For my two channel sessions, it plays loud.
During volume -10 sessions the heats sinks hit 129F, at -3 I have measured 150F.
At that point, ism probably running out of power but at 105+ DB I need to back it off to preserve my hearing smile.gif

The only reason to go for an A21 is for more class-A bias bit, I. My case background casual listening is covered by the A51.

- Rich
hmmmm wasnt aware an A51 could provide those kind of SPLs with out clipping?? I know for a fact mine couldnt drive my MA pl 300 at that volume without out clipping,,

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post #3062 of 3606 Old 02-23-2014, 05:23 PM
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So you are saying that you have clipped your a51? Sounds like you need more power?

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post #3063 of 3606 Old 02-23-2014, 05:24 PM
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Hey David I am interested in the fact that the a31 runs cooler since its in a cabinet. Unless I decide to put them on top of my submersives!

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post #3064 of 3606 Old 02-23-2014, 05:25 PM
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Quote:
Originally Posted by darrenbr View Post

hmmmm wasnt aware an A51 could provide those kind of SPLs with out clipping?? I know for a fact mine couldnt drive my MA pl 300 at that volume without out clipping,,

Those are some max numbers measured with an OmniMic 2.
It could be clipping, there is no way to know. The A51 has power reserves for musical peaks thus the Ultra2 certification.
I had an ATI3005 with clip indicators (who knows how sensitive) that I could illuminate between -6 and -3.
When pushed to very high-levels I am sure that most amps can clip a peak here and there without the listener knowing.

The Revels could take what the JC1s have to offer but the A51 is quite capable.

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post #3065 of 3606 Old 02-23-2014, 05:31 PM
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Originally Posted by exm View Post


I would go A51... No reason to go for A31+A21..

Sure, there is.  I keep the front channel amps up front with the front channel speakers while I keep the rear channel amps in the rack close to the rear channel speakers.


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post #3066 of 3606 Old 02-23-2014, 05:33 PM
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Originally Posted by llang269 View Post

So you are saying that you have clipped your a51? Sounds like you need more power?
thats why I have 4 JC1's smile.gif

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post #3067 of 3606 Old 02-23-2014, 05:34 PM
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Quote:
Originally Posted by RichB View Post

Those are some max numbers measured with an OmniMic 2.
It could be clipping, there is no way to know. The A51 has power reserves for musical peaks thus the Ultra2 certification.
I had an ATI3005 with clip indicators (who knows how sensitive) that I could illuminate between -6 and -3.
When pushed to very high-levels I am sure that most amps can clip a peak here and there without the listener knowing.

The Revels could take what the JC1s have to offer but the A51 is quite capable.

- Rich
Really?? my a 51 cant and no comparison to my A 21 let alone the JC1's

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post #3068 of 3606 Old 02-23-2014, 05:38 PM
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Hey Kal you have the a31 and a21 right?

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post #3069 of 3606 Old 02-23-2014, 05:52 PM
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Originally Posted by llang269 View Post

Hey Kal you have the a31 and a21 right?

Nope.  A31 up front (tag teams with a McIntosh MC-303) and a McCormack DNA-1, Rev A in the back.


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post #3070 of 3606 Old 02-23-2014, 06:01 PM
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Quote:
Originally Posted by darrenbr View Post

Really?? my a 51 cant and no comparison to my A 21 let alone the JC1's

I suppose it depends on your speakers, room, and how you measure them.

The A21 has more capacitance and a bit more transformer but has the same power specs as the a21 so it may have more reserve for peaks, but at high SPL/power levels a little power does not add much.

The JC1 is a different animal.

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post #3071 of 3606 Old 02-23-2014, 07:09 PM
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Quote:
Originally Posted by RichB View Post

I suppose it depends on your speakers, room, and how you measure them.

The A21 has more capacitance and a bit more transformer but has the same power specs as the a21 so it may have more reserve for peaks, but at high SPL/power levels a little power does not add much.

The JC1 is a different animal.

- Rich
The A51 will not out put the spls you are saying on those speakers without clipping i know for a fact

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post #3072 of 3606 Old 02-23-2014, 07:42 PM
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Quote:
Originally Posted by darrenbr View Post

The A51 will not out put the spls you are saying on those speakers without clipping i know for a fact

OK, That's interesting, Why don't you share them, including how the A21 can when the A51 cannot?

Unfortunately, amps clip more often than we realize. Good amps do it gracefully.

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post #3073 of 3606 Old 02-24-2014, 02:29 AM
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Originally Posted by Kimeran View Post

Only advantage I can see with the A21 and A31 is that they have adjustable gain while it doesnt look like you have it on the A51. It's up to you though if you find it important as you can adjust the gain in the prepro too....

Not when you're using one A21 for one speaker, the gain can be used to adjust the LF/HF output. Thats what i am doing for my own taste smile.gif
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post #3074 of 3606 Old 02-24-2014, 03:16 AM
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Well, if I start clipping my JTR Noesis speakers with 101 sensitivity with my new A51, then people 1 mile away will be hearing it too smile.gif
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post #3075 of 3606 Old 02-24-2014, 04:24 AM
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Have any of you guys or gals had any luck with an amplifier in bridge mode? I have a customer who wants to use a 2250 for his mains and a 2125 bridged for the center channel. Sounds like a recipe for noise.

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post #3076 of 3606 Old 02-24-2014, 04:47 AM
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Originally Posted by Tom Grooms View Post

Have any of you guys or gals had any luck with an amplifier in bridge mode? I have a customer who wants to use a 2250 for his mains and a 2125 bridged for the center channel. Sounds like a recipe for noise.

Maybe, maybe not. I've used my HK Citation 19 in bridged mode for a center and I could not detect any additional noise.
But as to if those extra watts are really needed would depend on speaker sensitivity and room size.
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post #3077 of 3606 Old 02-24-2014, 05:03 AM
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I wonder about additional heat. I sold him the 2250v2 and he loves it. Now he needs to power the center channel and he figures it's a good budget solution.

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post #3078 of 3606 Old 02-24-2014, 05:11 AM
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Quote:
Originally Posted by Tom Grooms View Post

Have any of you guys or gals had any luck with an amplifier in bridge mode? I have a customer who wants to use a 2250 for his mains and a 2125 bridged for the center channel. Sounds like a recipe for noise.

Hello Tom-I use a 275, bridged: put out 200 into 4, or 8 ohms, for my center channel. The unit was a non used, demo from Audio Advisor and works great and is dead quiet
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post #3079 of 3606 Old 02-24-2014, 06:41 AM
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Originally Posted by Dave Vaughn View Post

That's exactly the combo I'm using.

Just ordered the A23 in black for rear surround duties to match the black A51. Everything should be here this week smile.gif
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post #3080 of 3606 Old 02-24-2014, 07:31 AM
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Just ordered the A23 in black for rear surround duties to match the black A51. Everything should be here this week smile.gif

In the vein of overkill, I got a used 5125 to power my surrounds (LS, RS, LBS, and RBS) to give me the extra channels I needed. It's pretty ridiculous, in retrospect, but I am hoping to do dual centers and maybe some other things with the extra channels on the A52 and 5125.
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post #3081 of 3606 Old 02-24-2014, 10:08 AM
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Originally Posted by artur9 View Post

In the vein of overkill, I got a used 5125 to power my surrounds (LS, RS, LBS, and RBS) to give me the extra channels I needed. It's pretty ridiculous, in retrospect, but I am hoping to do dual centers and maybe some other things with the extra channels on the A52 and 5125.

That is a bad idea, if you plan on placing the centers in a horizontal plane.
You'll notice a shift in the sound, when you move horizontally. Even by only a bit.

Now if you were to place them in a vertical plane (one above, one below the screen) then that works.
The only time you will notice a shift in the sound is when you are moving vertically, as you sit down or stand up.
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post #3082 of 3606 Old 02-24-2014, 01:04 PM
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Originally Posted by 4DHD View Post

That is a bad idea, if you plan on placing the centers in a horizontal plane.
You'll notice a shift in the sound, when you move horizontally. Even by only a bit.

Now if you were to place them in a vertical plane (one above, one below the screen) then that works.
The only time you will notice a shift in the sound is when you are moving vertically, as you sit down or stand up.

Thanks! I've heard it's bad to have dual centers but never the reasoning- only that it causes comb filtering. Didn't know what audible effect comb filter would have.

But the plan was/is going to be one above/one below.

thanks again!
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post #3083 of 3606 Old 02-24-2014, 01:09 PM
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Originally Posted by llang269 View Post

Hey Dave and everyone else here I am wondering if there is a difference between the a51 or going the a31 and a21 route. I know the fewer boxes thing but anything else? Thanks in advance
The answer probably depends on what you plan to use them for. If mainly music, I think you will like the A21 on your front L/R. If mainly movies then you will save space and money with a one box solution. I own both the A21 and A51 and I prefer the A21 when listening to music.
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post #3084 of 3606 Old 02-24-2014, 01:20 PM
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The A31 and A51 are similar in design where the A21 is unique. Parasound would tell you the A21 would hold the advantage, however slight it may be (higher class A bias for one). For that reason the A21 & A31 combo may have the advantage. I have my eye on the A31 for center and surrounds, think it would be sweet.

Main Kef: Reference 205/2 & 202/2c, Surrounds: Kef XQ40, Velodyne Optimum 12, Integra DHC 80.3, Oppo BDP-103, Bryston 4Bsst2, Parasound Halo A31. Second B&W: 685 (3), CCM618, Def Tech Powerfield 1500, Onkyo TX-NR1008, DBP 2010, Samsung BD-C7900, Zone 2 Klipsch AW650. Sitting still CCM616, Kef...
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post #3085 of 3606 Old 02-24-2014, 10:03 PM
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I know this is minor, but i LOVED the layout on the rear of the A31...very easy to get at all the connections (unlike the A51, which is very cramped).

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post #3086 of 3606 Old 02-25-2014, 07:44 AM
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Does anyone know for certain if the 5250v2 is out of stock everywhere? I see that it has been discontinued, but I would still like to move into a new unit. I think at $4500 the Halo 5 channel is a bit more than I would like to spend, but the 5250v2 would be just about right. I have called all my local suppliers and most have stated they cannot get any, and the stock of these from Parasound has long since dried up. I really do not have the room in the rack to go with a 2 and 3 channel amp combo like some, but is my next best option to find an older 2205A and have it sent in to Parasound for checkup/repair?
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post #3087 of 3606 Old 02-25-2014, 07:45 AM
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unless you have giganticus syndrome (giant fat fingers) the A51 is easy to connect (i use locking bananas) if you start at bottom and work your way up


B&W 802 Diamond mains, B&W HTM2 Diamond center, B&W 804 Diamond surrounds, Parasound HALO A 51, Krell KAV-300i , Integra DHC-80.3 pre-pro, two JL Audio Fathom f113 subs, Panasonic TC-P65VT50 65" plasma
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post #3088 of 3606 Old 02-25-2014, 07:53 AM
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Bao01, how does your A51 perform compared to your Krell KAV-300i?

Life is enjoyable with good quality
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post #3089 of 3606 Old 02-25-2014, 08:23 AM
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Quote:
Originally Posted by bao01 View Post

unless you have giganticus syndrome (giant fat fingers) the A51 is easy to connect (i use locking bananas) if you start at bottom and work your way up

I use the same locking bananas but am concerned about the exposed metal barrels; if a tool or something fell on them it would cause a short and damage?

the crimp bananas that come with the P51 come with a PVC sleeve so they are protected
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post #3090 of 3606 Old 02-25-2014, 08:32 AM
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Originally Posted by markrubin View Post

I use the same locking bananas but am concerned about the exposed metal barrels; if a tool or something fell on them it would cause a short and damage?

the crimp bananas that come with the P51 come with a PVC sleeve so they are protected

One of my locking bananas was not well locked and came free shorting the right rear channel.
I would rather it not happen, but there was no damage.

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