SDA 2.3 & 200 watt mono block ?

bsoko2

I'm looking at a SDA SRS 2.3 and plan to run each one with a Oulaw Audio M2200, 200 watt mono block. The mono block is a single channel design so do I have to worry about grounding issues when I plug it in? Or when running the interconnect?

Bill

F1nut

The Model 2200 ($350) is a single channel 200-watt amplifier. You simply buy one for each speaker.

The answer to your question is you will most definitely have to concern yourself with common ground issues. Unless you can strap the negative outputs or use the AI-1 cable, you will not be able to use those amps with the SDA's.

ben62670

Bill are you looking at the SDA2.3's, or the SDA-SRS2's?

bsoko2

F1nut wrote: »

The answer to your question is you will most definitely have to concern yourself with common ground issues. Unless you can strap the negative outputs or use the AI-1 cable, you will not be able to use those amps with the SDA's.

Yes, I have one for each speaker. The person selling the 2.3 says he has ran them with mono blocks with no issues. He buys, repairs and sells old vintage speakers. He has had these for a number of years now. I am in negotiating with him now over the price. http://seattle.craigslist.org/kit/ele/948431288.html

Bill

bsoko2

ben62670 wrote: »

Bill are you looking at the SDA2.3's, or the SDA-SRS2's?

Looking at these http://seattle.craigslist.org/kit/ele/948431288.html. zingo has had dealings with the guy in the past.

Bill

F1nut

That doesn't mean that you should. It's common knowledge that doing so normally results in very bad juju. I mean, Polk tells you NOT to do it.

bsoko2

F1nut wrote: »

The answer to your question is you will most definitely have to concern yourself with common ground issues. Unless you can strap the negative outputs or use the AI-1 cable, you will not be able to use those amps with the SDA's.

This is greek to me. Can youy offer me a diagram or some lititure about this and how to do this. I run my speakers; RCA cable from reciever to mono block; banana plugin onto amp to banana plugin speaker. Now Polk says not to do this due to common ground issues. My reciever is grounded.

Bill

Face

Bill, if you don't heed F1Nut's or Polk's advice, you can toast your monoblocks.

george daniel

Bill ^^^^^^^^^^^^^listen to these guy's^^^^^^^^^^^^^ they KNOW what they are talking about,, so heed their advice, good luck.

ben62670

Face wrote: »

Bill, if you don't heed F1Nut's or Polk's advice, you can toast your monoblocks.

Or your speakers. It has happened here before. I have done it with a dual mono design(single amp):o Luckily it only blew some input resistors. Those are 2.3's so it they are worth getting. On the phone I thought you were talking about SDA-SRS2's.

F1nut do those have the newer style XO's on a single board?
Thanks
Ben

Ricardo

bsoko2 wrote: »

The person selling the 2.3 says he has ran them with mono blocks with no issues.

Make sure all the drivers are working.....

I am in negotiating with him now over the price.

You need to bring them down to near half what he's asking, or wait for the next pair

bsoko2

My Outlaw Audio Mono blocks are single channel and not connected for common ground. I will need a AI-1 cable in order to use their blocks on the SDA SRS 2.3. Where can I get this cable?

Bill

george daniel

here
http://www.polkaudio.com/forums/showthread.php?t=74472&highlight=dreadnaught



just built one and listened to it last night thru a pair of Odyssey mono's,,, previously the system was powered with a Carver TFM 45---- take the time to read the tread,, build one,, you won't regret it,, good luck and have fun.

ben62670

Alright George. Enough is enough. I am coming over :eek::p

george daniel

Come on,, they are my brothers and I FINALLY got him to buy the transformer,,I gave him the binding posts,etc and it got fired up last night,,the Odyssey's had been sitting on the floor with limited playing tme for 10 months,, betcha' that changes now.

Ron Temple

Aren't the 2.3s blade/blade? No AI-1 capability ? That leaves strapping the grounds, if it's doable...check with Outlaw.

bsoko2

Ron Temple wrote: »

Aren't the 2.3s blade/blade? No AI-1 capability ? That leaves strapping the grounds, if it's doable...check with Outlaw.

Outlaw didn't know anything about this! Their tech support refered me back to the manual and the Polk Audio AI-1 cable. Strapping the grounds, is this going from the Minus on the left amp to the Minus on the right speaker with a wire? Or do I run a wire from the left amp minus to the right amp minus? How do I do this in simple terms and not having to build a AI-1 cable setup.

Bill

Ron Temple

bsoko2 wrote: »

Outlaw didn't know anything about this! Their tech support refered me back to the manual and the Polk Audio AI-1 cable. Strapping the grounds, is this going from the Minus on the left amp to the Minus on the right speaker with a wire? Or do I run a wire from the left amp minus to the right amp minus? How do I do this in simple terms and not having to build a AI-1 cable setup.

Bill

Neg terminals on the amps...I've never done it, but I have seen a diagram around here somewhere. Ben's done it, I think. Also, someone around here is using Carver monos. The important question still needs to be answered by Outlaw. Will the 2 monos strapped be considered common ground. I would think so, but I'm not an EE...I'm more of a DOH :eek:.

shadowofnight

Ron Temple wrote: »

Aren't the 2.3s blade/blade? No AI-1 capability ? That leaves strapping the grounds, if it's doable...check with Outlaw.

My standard 2.3's with the donut 6513's is pin/blade and came with the AI-1 IC.

shadowofnight

Ricardo wrote: »

You need to bring them down to near half what he's asking, or wait for the next pair

+1 ....mine are as mint as mint gets ...came with the bass brace ....AI-1 IC and original boxes for 750.

ben62670

Ron Temple wrote: »

Neg terminals on the amps...I've never done it, but I have seen a diagram around here somewhere. Ben's done it, I think. Also, someone around here is using Carver monos. The important question still needs to be answered by Outlaw. Will the 2 monos strapped be considered common ground. I would think so, but I'm not an EE...I'm more of a DOH :eek:.

Joe did it before me. I don't know where he learned it, but there are some amps that the grounds are fit to be tied:D

ShinAce

Ok, so let's see if we can speed this along.

Can anyone find out if the amps have floating grounds(transformer coupled) or earth grounds(directly coupled to outlet ground)?

If they have floating and constant voltage grounds, they can be tied.

bsoko2

ShinAce wrote: »

Ok, so let's see if we can speed this along.

Can anyone find out if the amps have floating grounds(transformer coupled) or earth grounds(directly coupled to outlet ground)?

If they have floating and constant voltage grounds, they can be tied.

They are single channel amps.

Bill

heiney9

bsoko2 wrote: »

My Outlaw Audio Mono blocks are single channel and not connected for common ground. I will need a AI-1 cable in order to use their blocks on the SDA SRS 2.3. Where can I get this cable?

Bill

Keep in mind not all SDA's can use the AI-1 cable. Just because you can make one doesn't mean it will work. IIRC, the 2.3's may be able to use the AI-1 cable. I don't have the compendium handy, and frankly if you really want to know; it's been discussed on the forum many, many times.

IMO, and it's just my opinion, the time and money spent is a waste to make an AI-1 to use Outlaw mono's. They aren't that great of an amplifier. Sell the Outlaws use that money plus the $200 or so you would have spent on a proper AI-1 cable and get a nice stereo amp.

Again, this is just my opinion and that's what I'd do.

H9

ben62670

heiney9 wrote: »

Keep in mind not all SDA's can use the AI-1 cable. Just because you can make one doesn't mean it will work. IIRC, the 2.3's may be able to use the AI-1 cable. I don't have the compendium handy, and frankly if you really want to know; it's been discussed on the forum many, many times.

IMO, and it's just my opinion, the time and money spent is a waste to make an AI-1 to use Outlaw mono's. They aren't that great of an amplifier. Sell the Outlaws use that money plus the $200 or so you would have spent on a proper AI-1 cable and get a nice stereo amp.

Again, this is just my opinion and that's what I'd do.

H9

+1 He could get a used GFA-555 for the amount of money a nice A1 cost. All 2.3's are pin blade style. Bill you would actually come out ahead, or you could even go to a higher up amp if you fallow H9's suggestions.
Ben

bsoko2

OK guys, I'll pass on the 2.3's and wait. Save up for an amp that will run with the 2.3 in the future.

Bill

heiney9

bsoko2 wrote: »

OK guys, I'll pass on the 2.3's and wait. Save up for an amp that will run with the 2.3 in the future.

Bill

Bill, I don't think anyone said pass unless of course they are too much $$$. Just giving you some other constructive alternatives. If the 2.3's are the right $$$ you should certainly try to get them.

The gear can be worked out if the price is right on the 2.3's. $1250 is ludicrous in any market. Closer to $800 and then you are getting in the ballpark.

Good luck

H9

ShinAce

bsoko2 wrote: »

They are single channel amps.

Bill

That is correct.

The manual itself isn't much help since from scanning it the best I could find was "unique differential topology". Yeah, right.

heiney9

ShinAce wrote: »

That is correct.

The manual itself isn't much help since from scanning it the best I could find was "unique differential topology". Yeah, right.

Many of the Outlaws are class G or H designs. Not sure on the mono's, but I know it's been discussed many times before if you or the OP can find the threads that might help.

H9

ShinAce

The main issue is how the power from the transformer secondary is derived. If we know how the power rails are setup and how the speaker terminals are wired(differential power signals? one powered and one ground?, etc...), we can find out if the amps can be strapped.

bsoko2

The mono block is grounded thru the plugin.

Bill