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Old 9th November 2007, 03:10 AM   #1
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Default xt25 in 12in waveguide experiment

looks like I can crossover xt25 in 12in waveguide at 500hz
I don't know how loud it can play with such low crossover point,
at low volume tweeter sounds pretty good.
woofer measurements are near field. this woofer will need bass boost.
for now it's baffleless, later I'll probably add baffle.
for amplifier I'm going to use 4 channel t-amp
and equalize woofer with graphic equalizer.
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Old 9th November 2007, 03:16 AM   #2
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Old 9th November 2007, 03:26 AM   #3
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Even with the waveguide, the excursion of ring-rad tweeters is still comparatively low, right? It'll be interesting to hear your review once you start pumping up the volume.
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Old 9th November 2007, 02:40 PM   #4
jzagaja is offline jzagaja  Poland
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I'm doing similar experiment with DT400 and Tractrix. Does WG change TS parameters so that recommended crossover frequency can be shifted from 2,5kHz to 500Hz? Have you already chosen xo type to maintain good off axis response?

I see your throat is wider than cone diameter and this should lead to a phase cancellation around 10kHz.
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Old 9th November 2007, 03:39 PM   #5
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How about the XT25 5oo Hz resonance ? According to Zaph, this is a major issue, a notch would be needed.
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Old 9th November 2007, 04:58 PM   #6
Jay_WJ is offline Jay_WJ  United States
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You also need distortion measurement. XT25 is infamous for its steep distortion rise at the low end. Even with WG, I doubt you can cross it below 1 kHz.
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Old 9th November 2007, 05:53 PM   #7
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Default Re: xt25 in 12in waveguide experiment

Quote:
Originally posted by MisterTwister
looks like I can crossover xt25 in 12in waveguide at 500hz



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Old 9th November 2007, 05:58 PM   #8
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i second jay here, it's not cause it's still playin that it's good, or not distortin. You should add a second pole to your filter, to make a crossover around 1khz, and even then i doubt it will be ideal, but it will be good enough i think
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Old 10th November 2007, 02:14 AM   #9
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I taped gap between tweeter and waveguide with electrical tape, now it's almost seamless. I tried to play tweeters louder, It plays louder than I expected before becoming shouty. it's hard to evaluate tweeter alone. after I add woofer, I'll test them with good amplifier and let you know at what volume sound becomes unpleasant.
unfortunately I don't know how to measure distortion in speaker workshop. I haven't measured TS parameters either(will do it later).
you are all referring to Zaph's xt25 measurement, but he
tested G30 model, I am using G35(with ferrofluid)
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Old 10th November 2007, 03:54 AM   #10
Pano is offline Pano  United States
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Cool idea, Mr. T!

I've been thinking of something similar myself.
Same 12" driver, 4 channel Tripath amp, with a Selenium compression driver on a 12" waveguide. (Why? 'cause I have them).

I agree with the other posters here. You will probably want to mover you x-over point up. You might be hoping to get out of the Peerless 12 as soon as you can, but you really don't have to. Crossing up higher will likely sound better. Or using something else on the WG.

For an idea of what the Peerless SLS 830669 can do, have a look at this thread:
Fast, fun, Inexpensive OB project
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