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808-8A : midrange driver ...
24.140.98.34 |
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Posted 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. |