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Multi-Way Conventional loudspeakers with crossovers

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Old 21st November 2006, 08:10 AM   #51
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Hi Vikash

Sorry I wasn't around much this weekend, real life got in the way a bit. The first thing I see is those lumps on the FR chart. They look too regular to be from the driver, is it possible you have some room effects creeping in? Are they nearfield or at 1m? Could even be beaming...

As for the crossover, it looks pretty good, though you might have fun making up some of those cap values. What did the existing TDL3 cross over at? I can't recall.

Haven't done much with the PC for the last week or so, I need to get it all up and running again. Briccolo suggested using the KX drivers for my Audigy SC, as I was having issues with the Creative drivers after a nasty PC crash, so I should, (hopefully), get on that this week.
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Old 21st November 2006, 12:37 PM   #52
Vikash is offline Vikash  United Kingdom
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Quote:
The first thing I see is those lumps on the FR chart. They look too regular to be from the driver, is it possible you have some room effects creeping in? Are they nearfield or at 1m? Could even be beaming...
I think that's the comb filtering effect of the MTM. The measurements were taken at 1m. At 0.5m and 2m the same ripples are present.

Quote:
What did the existing TDL3 cross over at? I can't recall.
I measured and modelled the original xover and guess what!? It's uses half the parts and models better! Nothing to do here.

The grey line is my crossover. The black line is the original crossover. They know a simpler/better way to get round the L-Pad and notch filter that I couldn't do without. I obviously have a lot to learn yet!

V
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Old 1st December 2006, 09:46 PM   #53
Vikash is offline Vikash  United Kingdom
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Default Light at the end of the tunnel...

I did some more measurements today with the new crossover parts in place. It's the same xover design as the original (as per my previous post) just changed all the parts for half decent ones from Madisound.

My main concern with the measurements is the small null at 2.5k. All drivers measure ok when measured individually as can been seen, but when measured as a whole there seems to be an issue. I've pulled my hair out with this but I'm sure there's a simple explanation for it...

I'm going to pad the tweeter down a bit which may or may not take care of the not-so-nice top end of the original TDL's.
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Old 1st December 2006, 10:38 PM   #54
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Default Re: Light at the end of the tunnel...

Quote:
Originally posted by Vikash
IMy main concern with the measurements is the small null at 2.5k.
Hmm. I never measured mine, but now you mention it, it wouldn't suprise me if it was there all along.
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Old 2nd December 2006, 09:47 AM   #55
Vikash is offline Vikash  United Kingdom
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What wattage resistors are needed for the L-pad?
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Old 2nd December 2006, 03:30 PM   #56
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5w should be fine, (a guestimate without doing the maths), as the tweeter doesn't see a lot of power.
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Old 2nd December 2006, 04:06 PM   #57
Vikash is offline Vikash  United Kingdom
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Grrr that means ordering more parts. I was hoping the 2watters I have lying around might suffice.
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Old 2nd December 2006, 04:10 PM   #58
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Try 'em. Run some music at decent levels through the system for five minutes or so and see if they get hot. Or if you have lots, series/parallel them up, then they'll all share the dissipation.
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Old 2nd December 2006, 08:33 PM   #59
Salas is offline Salas  Greece
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Default Re: Light at the end of the tunnel...

Quote:
Originally posted by Vikash
I did some more measurements today with the new crossover parts in place. It's the same xover design as the original (as per my previous post) just changed all the parts for half decent ones from Madisound.

My main concern with the measurements is the small null at 2.5k. All drivers measure ok when measured individually as can been seen, but when measured as a whole there seems to be an issue. I've pulled my hair out with this but I'm sure there's a simple explanation for it...

I'm going to pad the tweeter down a bit which may or may not take care of the not-so-nice top end of the original TDL's.
Must be your -z and -Y +Y acoustic centres data. Plus that last octave rise looks suspicious. Maybe its your mic climbing due to edge diffraction in that 6mm brass tube. Is it checked against some other mic?
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Old 4th December 2006, 07:13 PM   #60
Vikash is offline Vikash  United Kingdom
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Hi Salas, I thought maybe I had made a mistake somewhere with the wiring but since that null measures the same even with the original crossover I don't see anything I can do about it.

I haven't 'checked' the mic against another. However my measured response follows the tweeter datasheet so there's no concern for me there.

One things I'm learning is that the MTM topology stinks.
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