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Re: How does doubling C.D.'s affect performance?

N,

Q & A follows.

Regards,

WHG

Q1: If I have a McCauley 6510 1" throat CD with a 1.75" v.c. that will handle 30w @ 500Hz, 60w @ 800Hz, and 100w @ 1200Hz, with an impedance of 8 ohms and overall eff. of 111 db/w, how would doubling up on the driver using a Y adaptor on a horn affect/improve performance?


A1: Increase power output capacity by 3 dB at same c/o.
Note that power output is a function of [Vd]=[Xmax]*[Sd] (horn loading held constant)

Q2: Would the power handling at a given frequency be doubled, and the setup effectively be able to play lower more safely, like a larger CD?

A2: Yes, but you are trading lower c/o for higher power handling capacity.

Q3: Approximately what size single CD would such a setup be equivalent to?

A3: For

[d1] = 1.75" and

[Sd] = ([pi]*[d1]^2)/4 = 2.4 sq.in.

then for doubling [Sd]

[d2] = 2*(2*[Sd1]/[pi])^(1/2) = 2.5”

Q4: Any other benefits? (One I thought of might be more extended freq. response than a single larger CD.)

A4: Correct!

Q5: Are there any downsides, (aside from cost)?

A5: Some HF cancellation at Y junction may be expected for wave lengths <= 0.3 dia. of single leg aperture at Y junction.

Preferred diaphragm materials:

HF driver - beryllium (lighter/stiffer)

MF driver - titanium (tougher)



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