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Multi-Way Conventional loudspeakers with crossovers

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Old 25th December 2012, 08:22 AM   #121
ODougbo is offline ODougbo  United States
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Looks like there was never a second PDF for the 4ohm. Madisound sent the 8ohm sheet; they should be the same according to MS.
(same as you found Sy7)

4K! That's up there yes? Well above the xo range?
Attached Images
File Type: jpg 832591.jpg (147.3 KB, 100 views)
File Type: jpg DSCN1025.JPG (291.6 KB, 98 views)
Attached Files
File Type: pdf 297-622.pdf (37.1 KB, 11 views)

Last edited by ODougbo; 25th December 2012 at 08:26 AM. Reason: new pic
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Old 25th December 2012, 06:07 PM   #122
system7 is offline system7  United Kingdom
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It's interesting that 4 ohm speakers don't seem to have the AAL3 resonance problem at around 4-7.5kHz which 8 ohm midbass speakers have, depending on what they are made of. It does look like a notch isn't necessary with the 4 ohm units (W170S) I looked at.

Vibration analysis

That all looks very nice to me, and I don't see much more tweaking there, though the 1.5R bass resistor is possibly on the large side for a 4 ohm unit. I'll probably start with 1 ohm with hindsight. The 3R/10R attenuator is right on the Vifa XT25 given its unique properties. It does look like the time-aligned modelling tends towards first-order treble, but that would be making what Lynn Olson calls a "Little Girl With A Guitar" speaker that sounds terrible with complex music.

Enjoyed this thread. It's firmed up some ideas for me. Thanks.
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File Type: jpg ODougbo_Filter.JPG (37.1 KB, 88 views)
File Type: jpg LGWAG_Loudspeaker.jpg (36.6 KB, 89 views)
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Well, there it is! Best regards from Steve in Portsmouth, UK.
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Old 25th December 2012, 06:16 PM   #123
system7 is offline system7  United Kingdom
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Oh, I nearly forgot. I dug up some specs for the Peerless 832591 and 832592. Beyond a VAS of 11 litres and a Qts of 0.4 with Le of 0.8mH, not very useful...but confirmatory of your design, I reckon.
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Well, there it is! Best regards from Steve in Portsmouth, UK.
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Old 26th December 2012, 08:47 AM   #124
ODougbo is offline ODougbo  United States
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Nephew came over for the day yesterday, he's getting into speakers etc. We hooked up several pairs and these were hands down the best; maybe my set best ever!

[the Vifa tweeter is very nice - you may want to pick up a pair before the price goes up]

Nephew's a computer guru and set up the wireless TV in seconds; we moved the RCAs cables around and watched a "streaming movie " Bourn Identity

Holy Cow...I didn't see this coming but the speakers sounded like they are angry little possessed monsters, bass like a sub woofer, shaking widows, crazy sound everywhere!!

D**m shame they don't make these little drivers anymore - I know the DIYers would love these (they were only $25 each).

Thoughts on bass: I don't know, I'd be worried messing with that.
btw -, dust cap was removed and cone has silicon layer.

Still fooling around with cap for tweeter - need the bigger size(s) to bring out the detail. I'm thinking the 6uf is to large and using a 4.7uf with a piggy back 1.0uf.
(I may add a toggle switch to the 1uf).

Also need to order some new caps in the 5 - 5.5 range.
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Old 26th December 2012, 07:06 PM   #125
ODougbo is offline ODougbo  United States
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update - the "original version"
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Old 27th December 2012, 09:47 AM   #126
ODougbo is offline ODougbo  United States
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I used a 2.2 bass resistor in the last set - I do think I like that one better.

I'm going to order some parts today anyway - I'll get an assortment of the smaller ones.

Ended up using a 12uf cap (vs. 15uf) I don't remember why that happened..

Bolted together a third pair - the darker wood set, and going to use a Morel MDT-30 for tweeter.

Edit...Morel is 8ohm 89db - Vifa 4ohm 91db :-/











Quote:
Originally Posted by system7 View Post
It's interesting that 4 ohm speakers don't seem to have the AAL3 resonance problem at around 4-7.5kHz which 8 ohm midbass speakers have, depending on what they are made of. It does look like a notch isn't necessary with the 4 ohm units (W170S) I looked at.

Vibration analysis

That all looks very nice to me, and I don't see much more tweaking there, though the 1.5R bass resistor is possibly on the large side for a 4 ohm unit. I'll probably start with 1 ohm with hindsight. The 3R/10R attenuator is right on the Vifa XT25 given its unique properties. It does look like the time-aligned modelling tends towards first-order treble, but that would be making what Lynn Olson calls a "Little Girl With A Guitar" speaker that sounds terrible with complex music.

Enjoyed this thread. It's firmed up some ideas for me. Thanks.

Last edited by ODougbo; 27th December 2012 at 10:06 AM.
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Old 28th December 2012, 08:22 AM   #127
ODougbo is offline ODougbo  United States
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Yikes...my HT room sounds like a dud now.

The wife and I have been listening to the pair of 2-ways for a few nights and now the 5.1 room sounds like there is no high end. I didn't see that coming....

The room with the 2 speakers has a china cabinet with a round glass door, getting a good echo for a rear channel effect (movies).

Correction to last post, the morel is the same 91db, but 8ohm; so the xo is never going to work as is.

I'll use the old 6bd xo for the tweeter; morel MTD 30 tweeter works well with a simple 3.3 cap and Lpad.
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Old 28th December 2012, 08:52 AM   #128
balerit is offline balerit  South Africa
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The morel of the story is never mix speakers with different impedances and keep the woofer and tweeter sensitivities the same.
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Old 28th December 2012, 09:28 AM   #129
ODougbo is offline ODougbo  United States
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Worse than you know - I just tossed 3 MTM boxes for these drivers - I could have double up the woofers.
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Old 28th December 2012, 09:50 AM   #130
balerit is offline balerit  South Africa
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Have you looked at the Audax site for ideas? look at: AUDAX Do it Yourself - Kits US4
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