Making it sing....

Tweakers' Asylum

Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

There seems to be a problem with my previous post disappearing. Regret any inconvenience and confusion if this turns out to be a double post.
I'm optimizing new speakers, and would be grateful for a sanity check on my plan. Will this work?
Using a pair of Welborne Labs DRD300B SET amps (tapped 8ohms) with a 3-way passive crossover to integrate these drivers. Here is the "default" crossover set-up, as supplied by the designer:
-Electro Voice EVM15L woofer, 8ohms, 80Hz horn, 1.5mH coil
-Vitavox S2 midrange, 15ohms, 350Hz horn, 5uf cap, 2.5dB L-pad
-Fane ST5022 bullet tweeter, 8 ohms, 1 uf cap, 2.8dB L-pad
-There is also a subwoofer that rolls in beginning ~70Hz using an active 4th order low-pass filter and 5-6dB bass boost ~30Hz
I want to "optimize" this crossover network to extract the best these drivers have to offer, and remove components where it will do no harm:
- Remove L-pads from mid and tweeter (sounds a little brighter, yet "more pure" and "better" to my ears)
- Remove the 1.5mH coil from the woofer. Again, sounds clearer w/o the coil to me. Any adverse impedance matching issues?
- Add a 80Hz or 40Hz 1st order high-pass filter before the amps. The Welbornes have 100k input Z, preamp has 130ohm output Z. Install a 30pf or 22pf cap at the amp inputs or pre outs.
- Use the S2 lower ~1100Hz replacing 5uf cap with 10uf cap
- Still working with the Fane, but want to experiment with other tweeters like Fostex, Raven or EV T350 (never heard these but interested enough to listen).
Does this sound like a good idea?
Thanks much.
scott

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Topic - Making it sing.... - tetsuo 13:25:15 07/6/05 (0)

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