NAD 2200 or Adcom 545

sdabeliever

I have a (new) pair of sda 2's and an adcom gfp 555 what do you think would be a better sounding amp with this setup?

NAD 2200 power envelope or
ADCOM gfa 545

post you opinions!

dorokusai

You might as well stick with Adcom. Out of the two amplifiers, I prefer the NAD. It's a great amp.

George Grand

2200PE's are boss.

hoosier21

anonymouse wrote: »

The 2200PE is *not* common ground.

your right

BigMac

deleted.

DollarDave

Are any of the other NAD amps common ground?

BigMac

Found this looking for an answer to the common ground issue.

http://www.polkaudio.com/forums/archive/index.php/t-25249.html

sdabeliever

Uuhhhmmmmm. I bought the NAD today for $200. was that a mistake? I'm hearing you guys say this may not work. correct? please say it's not true!!

sdabeliever

anonymouse wrote: »

Now will this work with SDA's? It might, *but*
1) make *very, very sure* that the SDA cable you are using does not connect the two grounds together.

what do you mean?

sdabeliever

sorry for the noob question ....How do I build that cable? (where do I look for the info? )

also does this mean in the meanwhile I can disconnect the SDA cable and use the 2200pe?

sdabeliever

sda 2 with the blade blade
..

sweet!

sdabeliever

will do. Thank you...It'll be a couple of days b4 I get the amp.

sdabeliever

And you're right. it is boss. It honestly puts our onko m504 to shame : (

anonymouse RE: the OHM's I hooked up a multimeter as you suggested.. everything hooked up with the sda cable connected and nothing turned on. OHMs are about 1/3 of an ohm at the two negative terminals.

I also hooked up our M504 and got the same reading...?

so is a 1/3 of an ohm bad?

sdabeliever

I couldn't edit for some reason...

so another way to ask the question is. Does a reading of 1/3 ohm indicate common ground or non common ground?

I'm getting the same reading when the onkyo m504 and we've had that hooked up to my father in laws 2.3's for a year.

sdabeliever

It's exactly the same with SDA cable or without and with either amp.

I tried both set ups on my father in laws' 2.3's and got the same results= ~1/3 ohm

sdabeliever

OK. 1/3 OHM with the sda cable connected on my SDA 2's VS. "off the chart" disconnected. (all the way at the other end of the gauge.)

sdabeliever

UPDATE:

my multi meter was not zeroed correctly. It's 1/3 of an ohm off.

I called my local stereo expert and he said the opposite of what you guys are saying. That if it reads zero that it is a common ground amp and that it's fine to use.

??

heiney9

sdabeliever wrote: »

UPDATE:

my multi meter was not zeroed correctly. It's 1/3 of an ohm off.

I called my local stereo expert and he said the opposite of what you guys are saying. That if it reads zero that it is a common ground amp and that it's fine to use.

??

Reread post #12.................that's what was said. If it reads 0 or close to it then it's common ground and safe to use. The SDA cable has nothing to do with your measurements. You are measuring at the receiver or amplifer's speaker terminals. Power off and speakers disconnected. And as an extra precaution power cord UNPLUGGED.

H9

sdabeliever

Sorry guys I don't seem to be getting this. I know how to use a multimeter but have no idea how this common ground/ non common ground thing works electrically in regards to resistance..hence my confusion.

anonymouse:
I just did this last test and the results are as follows. (with the amp unplugged from the wall) I measured the resistance (the speaker wires were still hooked up) at the two black terminals on the amp= zero ohms. Also measured resistance between black on left and red on right=zero ohms.

You are saying this conclusively proves that it is a NON common ground amp...correct?
If so can you or someone please help me find how to build the A1 sda cable with a transformer (I've only been able to find mention of it on the forum so far)

Heiney9:
I must be misunderstanding what you wrote because to me you and anonymouse are saying the opposite. you said: "If it reads 0 or close to it then it's common ground and safe to use." Anonymouse just said: "What you will find is that the resistance is nearly zero from the negative of one channel and the POSITIVE on the other channel, proving conclusively that this amp is not common ground."

i just want to understand the bottom line not be a pain.

sdabeliever

Thanks. sad news. nice amp

would it be cheaper to alter the cable I have? Do I need anything other than a transformer to do this? I'll lose at least $50 (shipping paid) on this amp if I turn around and sell it.

Kex

anonymouse wrote: »

... The 2200PE is a very interesting beast. It has an innovative power supply. Because both channels share the same power supply, they invert one channel's input so that when a massive peak demand exists e.g. a bass intensive kick, both halves of the power (+ve and -ve) are working, rather than one side only. At the outputs, one channel is also inverted. ...

Is that what they call "Power Drive" technology, or is that something different entirely? A fairly recent review of the T955 highlighted this feature, and I'm just curious if it's useful, or if it's useless marketing blurb.

Sorry to derail, slightly, sdabeliever.

daboyz

I wish I would've posted earlier,don't know if it would've mattered but the Adcom 545 is one helluva amp.

heiney9

daboyz wrote: »

I wish I would've posted earlier,don't know if it would've mattered but the Adcom 545 is one helluva amp.

Yeah Dave it is, but Adcom gets very little respect here on CP. I've been an advocate for awhile...................but it falls on deaf ears. I'm done speaking of my 20 years of experience with Adcom because..............well ADCOM SUCKS!!! Just ask most people here.

To the OP, sorry if I confused you. Do a search for "common ground" and you should find plenty. I've always understood a common ground amp to read close to zero when using a meter measuring the negative speaker terminals on the amp or receiver.

Good luck on your quest

H9

P.s. FAAAAAAAAAAAAAAK Emotiva is the shiznit and is the best you can buy.............just look at all the threads :rolleyes:

heiney9

The only time (it seems) Adcom gets more than an indifferent review is if one is FS..............then the seller can't say enough positives about their virtues.

I can think of a couple hypocritical sales .

H9

daboyz

We'll just keep it our little secret. But, I'll tell you it drives my SDA's very well and as soon as those Lsi9's get here the first amp they'll be hooked up to is the 545.

heiney9

daboyz wrote: »

We'll just keep it our little secret. But, I'll tell you it drives my SDA's very well and as soon as those Lsi9's get here the first amp they'll be hooked up to is the 545.

As you know I've run LSi 9's as well as my 1C's and have yet to clip the amp, But what do I know. Not saying the NAD is poor choice.........because it's not they are both in the same class.

Oh well, not wanting to turn this into a pity party. Parasound, NAD, Emotiva, Outlaw, Carver, Sunfire, etc; all get the majority of the votes over the lowly and embarrassing Adcom. What do I know...............................I've listened to most of these amps and I still prefer the Adcom by a slight margin. The only amp that I liked better was the Marsh and that was atleast double or more the cost. Again what do I know...........

Wwhen I get my Pass amp..........................Adcom will forever be CRAP :rolleyes::p:rolleyes:

H9

ben62670

I loved my 545. I wish I could have kept that, the 5800, and the 7500 for HT. I won't cry a river though. I am very happy to have my 585, and my 565's mono's especially considering that I paid next to nothing because I know how to repair them:) Some day I want to get my ears on a 5802;)

heiney9

Part of what I said is tongue-n-cheek, but there is some truth there in what I said.

daboyz

Ben, your 545 is my little baby now and I wish that you would stop coveting it, like now!!;) Having both the Marsh and the 545 I've actually come closer to selling the Marsh(except for a mishap;)) than I have the Adcom. I always thought that the Dodd and the Marsh were my two untouchables but I have never even thought of selling the 545.

heiney9

I've always said..............for 20 years that the 545 is the "gem" of the line. I sold more 545's than the other 2. Again Adcom is not the be all and end all of amps.......but they are a damn fine sounding reliable workhorse inspired by Nelson Pass.

I'm ready to move up the chain but the 545 will stay in office room duty when I do move way up the chain.

H9

P.s. It's late I've had a few and now it's time to stop being such a fanboy.

daboyz

Can I get an Amen and two hallelujahs!!!Thank God the RAS has a clue.