daisychain amps and common ground with 2bs

scottyboy76

im thinking of daisychaining 2 marantz ma 500u monos for 360 watts a side. the owners manual shows a funky setup, running the grounds together instead of to speakers, sorry i dont know how to link or display that from marantz site.

Will print out an image and post it in a moment

Also, i have read some posts, I think on ak, where the monos, when daisyd, actually see a 4 ohm load, not good, some say, others say if manufacturer says you can do it,do it, but i would hate to damage anything, after all, these are notstraightforward speakers to hook up to monos, with the ai cable and such

Also, should i be worried about the quality of signal coming from direct tv sonic tap music channels, or a denon dcm 400, older, good quality cd player, at these volumes.

im itching to hear these guys open up with more power.

I appreciate any info, sorry about the rambling question, sometimes asking questions can be tough when you know so little about what you are asking about.

Rev. Hayes

:eek:

Forgive my ignorance but what in the world do you need 360 WPC into SDA 2's for?

scottyboy76

not gonna crank the marantz sr 8000 that is my pre, but they are rated at 250 watts.

Overkill in a smallish room?

FTGV

scottyboy76 wrote: »

im thinking of daisychaining 2 marantz ma 500u monos for 360 watts a side. the owners manual shows a funky setup, running the grounds together instead of to speakers, sorry i dont know how to link or display that from marantz site.

I assume you mean using 4 MA500's?(as 2 are needed per ch).If so that setup effectively bridges the two modules which results in them no longer being common ground.Looking closely at the diagram shows that yes the grounds are tied together but the output to the speakers is taken from the positive or (hot)terminal of each unit and not the negative(ground).
While linking the grounds as shown in the diagram makes the ground common between those two modules for that channel only,the ground is not common to the other channel.Therefore you risk damaging the amplifiers if used with SDA's.

Schurkey

FTGV wrote: »

Therefore you risk damaging the amplifiers if used with SDA's.

Unless you pull the SDA interconnect cable, OR use an AI-1 isolation transformer or equivalent.

F1nut

Bad idea all around.

TroyD

The 2b's are pretty efficient and not all that demanding on an amp. No reason to even consider this unless it's a compensation issue.

BDT

Joe08867

+1,000,000. Seriously though there is no need to push 2b that hard at all. Awesome speakers that don't need 1.21 gigawatts to get excited.

I used to push a pair with a 15watt Tube amp that just had them singing.

scottyboy76

okay okay, lets not push the boundaries anymore in this country.

It will be just me and kramer seeing how far we can go, once the gas gauge gets past E. fine

scottyboy76

fine

TroyD

scottyboy76 wrote: »

okay okay, lets not push the boundaries anymore in this country.

It will be just me and kramer seeing how far we can go, once the gas gauge gets past E. fine

Pushing boundaires?

Who do you think you are? Neil Armstrong??

If you are asking for opinions (you know, phrased in the form of a question), be prepared for the possibility of getting input that isn't the handjob you were looking for.

BDT

FTGV

scottyboy76 wrote: »

fine

Your welcome.

scottyboy76

I cannot believe that over the top so far out of line with reality joke i posted was taken seriously.

Even threw in a reference to a seinfeld episode, still didnt do it apparently.

And "pushing the boundarys in this country" in reference to which amps to hook to my speakers?

Thats not so far out of proportion as to make it clear its purely a moment of lighthearted fun?

FINE

I mean sorry

scottyboy76

If i didnt know everyone on here are guys, the handjob thing might .....never mind.

inspiredsports

scottyboy76 wrote: »

im thinking of daisychaining 2 marantz ma 500u monos for 360 watts a side. the owners manual shows a funky setup, running the grounds together instead of to speakers, sorry i dont know how to link or display that from marantz site.

Will print out an image and post it in a moment

Also, i have read some posts, I think on ak, where the monos, when daisyd, actually see a 4 ohm load, not good, some say, others say if manufacturer says you can do it,do it, but i would hate to damage anything, after all, these are notstraightforward speakers to hook up to monos, with the ai cable and such

Also, should i be worried about the quality of signal coming from direct tv sonic tap music channels, or a denon dcm 400, older, good quality cd player, at these volumes.

im itching to hear these guys open up with more power.

I appreciate any info, sorry about the rambling question, sometimes asking questions can be tough when you know so little about what you are asking about.

I am reminded of myself when I started back into this hobby in earnest a few years ago, bringing the 2B's I bought brand new back-in-the-day up to snuff.

At one point (briefly, thank God) I bridged my NAD gear to drop about 480w RMS into each one of those magnificently efficient (92db I think) jewels.

Now I use just the first few watts of some carefully selected, rebuilt, low power tube gear and get much better sound quality (up to 105-110db+ ear-bleed levels if I want) in my 28X32X8 man cave.

What you are doing is fun and illustrative, but sound quality-wise, probably not the way you will want to keep your system laid out.

sda2mike

TroyD wrote: »

be prepared for the possibility of getting input that isn't the handjob you were looking for.

BDT

words to remember