I give UP Aerial 10Ts and Power Amps


Ok, about 30 days ago, I ran a post stating my Citation 7.1, a 4 channel 210 x 4 (biamping my speakers) started cutting in and out at VERY loud levels, probably +100db, give or take. Everyone pointed to larger amps, that the speaker, a 4 ohms load, could take anything I threw at it.
Well, I took that word, while keeping my Citations, and threw a set of Jeff Rowland monoblock 7III's at them!
The babies, definitely high current, 350 into 8 ohms, 700 into 4 ohms, and a whopping 1100 into 2 (not that we are going to 2, but I suppose it could drop) ohms. That said, it happened again! WHAT GIVES?

It did this with the Casablanca, the Citation 5.0, and tomorrow I will be with the keeper, the Proceed PAV/PDSD combo. NOW, what is causing this? Could it be the speaker has a cut off to prevent any clipping, could it be the power in the house hits a wall and can't go anymore, could it be cables, power cords, what?

Or, dare I say, could I have just hit the limits of volume for a home and this set of speakers?

For what it is worth, I do not listen to things this loud, ever, or RARELY, but when changing pieces, I do PUSH to know the limits.

HELP!!!!!

Frustrated home theater guy trying to learn more about 2 channel!

Dan
porschecab

Showing 4 responses by stehno

You keep playing it loud to determine the limits and then you hit a limitation and you don't know what to do.

It's possible that at that high current your amps may be running out of power if they are on 15 amp circuits.

Also, the amps may be running out of juice if any other component is drawing power from/sharing the same circuit as your amps.

Also, the amps may be running out of juice if the amps are sharing the same circuit.

Each amplifier should be on it's own dedicated 20 amp circuit and circuit breaker.

I've been informed that if you have a high powered amp, that a 15 amp circuit at the service panel can actually limit the current to the amp acting as a govenor. Even if that's not true, you should still have 10 gauge wiring, 20 amp wall outlets, and a 20 amp circuit breaker at the service panel for each amplifier. At your volume levels you're liable to trip the circuits or start a fire.

Nevertheless, since you insist on playing your system at full volume (even tho you won't admit it), you should dump whatever amps you have at the moment and pick up the used McCormack DNA-2 Deluxe Rev A that's for sale right now on audiogon.

Most amps start straining or getting congested at higher volumes, but, as Internation Audio Review pointed out, this one stays clean, clear, and unflustered.

-IMO
Sean, the amps do not have to be 'starving' to experience some to many of the affects of being starved. Simply being a little hungry is enough seriuosly hamper an amps ability to perform. And I have no idea what affects a little hunger may have at full volume, but I'm sure it's not pretty.

For example, I have a 600 wpc @ 4ohm amp on a dedicated 20 amp circuit. However, until I installed my 3rd dedicated circuit/line, my preamp shared the amp's line. The preamp only consumes something like 36 watts or so, hardly anything. When I moved the pre off the amplifier's circuit, the amp just started singing dynamics. Huge difference in the dynamic headroom.

And I 90% of the time I play my music at just over 10 percent of full volume.
Sbruzonsky is correct. Monster is usually good to stay away from anyway. But with the current draw from your amp, you would need a very high powered AC regenerator which are very expensive.

I'm using a Foundation Research LC-2 in-line power conditioner but even that is only rated for 200 or 250 wpc so I'm suffering just a bit in that it weakens the bass ever so slightly. But it works wonders otherwise and I don't need an aftermarket power cord since it is 'in-line'. On top of that it does more that most power cords can do and costs about the same as a very nice power cord.