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808-8A : midrange driver ...

Posted by deathtube 667 on April 4, 2015 at 07:01:09

Got re-magnetized 808-8A back from GPA.

Bill told me these drivers don't have much output past 10KHz and start dropping off around 8KHz.

He suggested using the 800Hz crossover point with 811B horns.

I set up my XM9 for 800Hz and added a Foster horn tweeter crossing over first order at 13KHz.

This was OK except for a huge 9.5dB peak at 2KHz that was about 1 1/2 octaves wide.

I used a series cap and coil across the +/- of the 808-8A and it took out the 2KHz peak almost entirely.

-3dB point measured in room 13250Hz at my listening position.

The 808-8A/811B/Foster combo sounds very nice once dialed in.

Also added a powered sub from 80Hz to -3dB point of 38Hz.

I got Tuba 18 plans, not started on those yet.

Might do a mock up with cardboard since they seem a bit more complex than a simple ported box.

Edit: added some small wooden baffles to mount Foster horns to 811B.

Still debating need for active EQ and upgrade to 55-1220.

Edits: 04/06/15

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