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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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PostPosted: 26 Mar 2019, 10:08 

Joined: 26 Mar 2015, 10:00
Posts: 1
I recently got a pair of these Radio Shack 40-1310 Horn Super Tweeter. I noticed a crossover modification listed but it does not have an explanation for dummies. I would think that the parallel capacitors shown go from + input to the tweeter + and - goes from tweeter to ground. Is that about it?

PostPosted: 02 Apr 2019, 19:49 

Joined: 23 Feb 2017, 02:02
Posts: 677
You need matching sensitivy (dB) for booth fullrange speaker and tweeter, also look out to check if the senstivty curve is flat.
Sensitvity means if you put in 1w the ammount of volume you get out, same sensitivy means speaker gives same volume with same power input.

Is mostly impossible to get very good mathcing without the use of cross over on both woofer and tweeter when crossing above 6khz.
A simple 1st order on both high and low should work.

If the senstivity is not same as woofer but higher, you can use high power resitors and cut down the voltage at tweeter. By using a resitor divider and calculating values that keep the total impeance at 8 ohms.
Also keep in mind that half the voltage is not half the power to woofer. So you need to convert the calculated reduction in voltage from divider network to power.

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