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Old 23rd February 2013, 08:29 AM   #111
ODougbo is offline ODougbo  United States
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Well the foil coil was another upgrade, it was only $3 more than the wire wound, same awg. (wish I realized that a while back).
Gesh what great bass, sounds like there a sub-woofer is in the room.

Some folks are coming over today to check them out, we'll see how that goes. I have 8, I wouldn't mind selling a pair to buy/grade more parts.

The coil is a bit clunky - thinking I may bury that inside the box and run extra "ground" wire out to a smaller xo board to the back of the speaker.

Last edited by ODougbo; 23rd February 2013 at 08:46 AM.
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Old 4th March 2013, 09:26 AM   #112
ODougbo is offline ODougbo  United States
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Still building these.....Wife are I are can hear every beep/bop/whisper in moves AND crazy low bass.

If there is some issue with the tweeter's xo point, can't hear it at normal listen levels.

Added a few extra wood strips - to cover ply end-grain.
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Old 4th March 2013, 09:42 AM   #113
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It's great re-discovering your music collection isn't it I remember when I first built my mosfet amp. I still had really ordinary speakers back then, but the difference to my first amp (cobbled together on matrix board with bd139 and bd140 transistors as the outputs) was quite suprising. I can remember listening to Pink Floyd the final cut and noticing the sound of pool balls being hit in the background, I'd never heard that before!

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Old 9th March 2013, 09:43 AM   #114
ODougbo is offline ODougbo  United States
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Pics of "Square Donuts" bases, for xo parts.

I checked around for "terminal strips" darn things are expensive, might just use some wire end crimp-on - second photo, btm. left.
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Old 10th March 2013, 12:44 AM   #115
tvrgeek is offline tvrgeek  United States
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Take it into context that we are talking $35 tweeter and woofer here. A lot of speakers in this range are just plain bad. These may just be the winners at the price point. I have not found a cheaper tweeter that I can stand at all, let alone hold it's own and the SF is a similar bargain. Even at this price, the quality of the crossover components is evident, not wasted. Something to think about. Full disclosure, I just don't like the XT25 much, feeling $20 more for a Seas is well worth it IMHO. A better woofer is a bigger jump. These are a well matched pair and when properly executed will make a very good showing of themselves.

I can verify these are getting pretty darn good. We were listening with no sub. Their f3 is in the 60 or so range so his description of real base is valid. Not the sub part, but real. The cabinets are a bit oversize, but instead of a peaky roll-off as you expect in a too-big ported box, they sound a bit more like a sealed box rolling of easy to blend with the room. Doug's port design here needs further investigation to see what it is doing. The asymmetry bothers me in concept, but it seems to work.

Joni Mitchel (Morgantown) did pretty well being properly balanced. Joan Baez (Diamonds and Rust) was just a tad off. Darn close. Their voices are just plain hard to get right. Harry James will show you why you may want to spend twice as much for a tweeter. Crank them high enough for Gliere (The Red Poppy) and you see where paying 5 times as much for Scan Speak comes into its own. Imaging was hampered by the too close bright wall. It was focused, but constrained within the speaker width. Real living rooms do have limitations.

These are just about ready for prime time. Maybe a bit of creative "Penguin" paint. Just one pair. (The WAF would not be good but the photo would be great)

Those without test tools should be heartened as he has done these entirely by ear.
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Old 10th March 2013, 12:13 PM   #116
ODougbo is offline ODougbo  United States
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Thanks for stopping by, I had a few surprises also - BACH Toccata & Fugue in d. First Congregation Church; never would have but that on, but it's a great demo CD. Wow! I laugh every time I hear it!

Really need to give a shout out to Michael C., This project got of the ground because of his advise, and MS designed the LEAP xo.
What did I do? I dreamed up the flare ports, which was inspired by working on full range boxes.

A musician also stopped by yesterday, he was simply amazed; we only had pop music, and watched a few movie scenes, but they seem handle a wide range of sounds.

I wish I had a truck load of them, they would be an easy sell!

Silver Flute woofer - $29
Vifa tweeter - $32 - $35

Last edited by ODougbo; 10th March 2013 at 12:29 PM.
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Old 11th March 2013, 09:53 AM   #117
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Okay sorry about that - there was a mistake

I'm sure it's fine now
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Old 12th March 2013, 08:25 AM   #118
ODougbo is offline ODougbo  United States
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All fixed up - the imaging jump right back into the room.
Somewhat amazing really.

Used brand new caps, although the same as before, I think they'll need 100 - 200 hours to break them in.
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Old 18th March 2013, 11:22 AM   #119
tvrgeek is offline tvrgeek  United States
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Measured the TSP on a broken in Silver FLute. WAY different from the spec. Would believe it's VAS is LESS? Yes it is. Verified model performance in a 10L box.

First thing I noticed is a serious problem with the pole piece vent. Too small and it will whistle at low frequencies above 2 Watts. This is something I think they could improve. It also causes quite a glitch at 900 Hz. It rolls off faster above 1K that the charts would suggest.

Posted is the nearfield in 10L sealed box with a Q of .69. I will do 1 meter outside as soon as it warm up a bit. 34 degrees, a bit chilly.
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Old 19th March 2013, 07:59 AM   #120
ODougbo is offline ODougbo  United States
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What the target for the MS notch filter (750hz)? Also surprised this woofer needs the "large" 1.5 coil, looking at the test response (although I found this to be the case with experimenting).
I added just a little more damping wool; up to 5.9oz, which I thought worked nicely.

btw, we could try the MDT 30s, have a few of them laying around, they'll go down to 1,500.

Last edited by ODougbo; 19th March 2013 at 08:02 AM.
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