Re: Mackie FR 1400

On Aug 3, 12:54 pm, "Nate K." <musicluvah1...@xxxxxxxxx> wrote:

Each of the speakers runs at 8ohms.

So worst case you'd have two speakers in parallel on a channel which
is 4 ohms. The amplifier should handle that as long as you're not
asking it to deliver too much power (too loud). The "1400" is only
1400 watts under certain conditions. At 4 ohms, it's a 450 watt per
channel amplifier. That used to be a lot of power, but today it's just
sort of medium-rare.

Just to keep things better balanced and maintain some degree of
control, I'd suggest putting your two mains in parallel and connecting
them to one channel, and connect the monitor to the other channel.
That way the volume from the mains would be the same rather than
splitting the amplifier's power between one main and one monitor. And
you could adjust the volume of the mains and monitor separately.

Or does it really not make a difference because the total load will be
the same regardless of the configuration? I'm also suspecting that
our practice space is not ideal since it gets very hot in the room we
are in (easily 100-110 degrees F).

The load is on a per-channel basis, unless you're running it in the
bridged mono mode, and in that mode it won't be happy with all three
speakers connected to it since that woud drop the load below 4 ohms.

If the amplifier's ambient temperature is 100-110 degrees and you're
running it close to rated power, then it may very well go into thermal
protection mode. There are few power amplifiers that will be happy
with that ambient temperature without some forced air circulation.

I know that in the early days of the SRM-450, they were having a lot
of problems with the speakers shutting down when they were set up as
floor monitors, particularly on outdoor stages. The heat sinks were
oriented with the fins parallel to the long dimension of the box, so
they were horizontal in "monitor" position. Since heat rises, it was
trying to go across the heat sink fins rather than along them and
wasn't getting carried away. They re-oriented the fins and it stopped
overheating.


.

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