> My question is: Would it be advantageous to add additional
> cooling via
> something like added muffin fans on the sides pushing air
> into the amp?
The answer really depends on the restrictions and the fan,
but for any given fan the air movement is always much higher
when the inlet is not restricted. Fans and blowers are all
air inlet critical.
They actually behave like pressure amplifiers, where a small
change on the inlet results in a large change on the
If you had a given size fan that was adequate to handle the
flow and added it to the inlet of the PA, the flow volume
would increase significantly more than the very same fan
added to the outlet. The problem is when we disturb an open
flow system like the 922, we might move airflow away from an
area where we need the airflow. It isn't as straightforward
as having a small defined inlet and adding pressure there.
It's interesting to get something to measure flow and noise
and watch the difference in noise and flow when a
restriction is moved from an outlet to an inlet, or when a
booster fan is added.
I hate to dredge up cars again, but think of the difference
between boosting the air inlet on the engine vs. just
sucking on the tailpipe. The largest change is always on the
inlet, whether it is boost or restriction.
This doesn't mean the other way doesn't do anything, it just
means it is significantly more efficient to keep inlet
pressure up than outlet pressure down.
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