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View Full Version : Adding a tweeter to S7 load (LE15A, LE85 w/ HL91, and LX5 crossover)



FoolForARadio
10-11-2011, 08:07 AM
While I am waiting for an 077 tweeter and the right crossover to appear, I want to see what these sound like with a tweeter. I have a pair of Selenium ST324 supertweeters 8 Ohm 3500Hz-18000Hz. Any advice about how to get these hooked up? I don't want to modify the LX5 crossover.

ivica
10-12-2011, 06:52 AM
While I am waiting for an 077 tweeter and the right crossover to appear, I want to see what these sound like with a tweeter. I have a pair of Selenium ST324 supertweeters 8 Ohm 3500Hz-18000Hz. Any advice about how to get these hooked up? I don't want to modify the LX5 crossover.

Keep in mid that LX5 is about 500Hz crossover, and that can "over drive" LE85 if too loud.

So N3133 would be a good starting point, but with some revision on UHF part concerning the differences between 077 (2405) and ST324 has to be done.
My suggestion would be to add 0.16mH inductor "in series" with 1.5uF" capacitor in N3133, and may be 20 ohm resistor parallel to original inductor 0.16 mH. I expect that that would reduce the frequency "peak" about 10kHz, and 'enhance' region over 12kHz (where ST324 'slow down')

FoolForARadio
10-13-2011, 03:30 AM
Thanks - it seems like a good place to start. Reading about the N3133, I see alot of people have been down this path...

FoolForARadio
11-06-2011, 05:42 PM
I built one of the crossovers recommended by Ivica and hooked the Selinium ST324 up. 1st time I ever tried to build from a schematic so I hope I did it right. I used 0.15 mH inductors instead of 0.16 mH since that's what Parts Express had. Anyway it seems to work and sounds good so I guess it's getting the proper frequencies. Less volume than I would have thought. But I definitely pick up some high end reinforcement. I've got a Mickey Hart percussion CD with a lot of trebly shakers, cymbals, and so forth - sounds real good.

http://i1116.photobucket.com/albums/k568/jcgarrison1/DSC_0690.jpg