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Multi-Way Conventional loudspeakers with crossovers

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Old 1st February 2007, 11:01 PM   #1121
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Default update on line sources

I've finally finished tweaking the line source BG/ATC dipoles built ~12 mos. ago... and figured out the sonic character... listening to most well recorded discs, the imaging is such that each instrument sounds as if it has its own speaker custom designed for it, and its placement in the room is rock-solid even as I move around and between them.

Click the image to open in full size.

also added another sonosub to balance the room... dynamics are spectacular and bass extension is now rock solid to below 20hz and it's as if the subs aren't there... all sound seems to float in the room...

quite a sensation.. only thing left is to redo the finish to a professional level... when it gets warmer

John L.
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Old 1st February 2007, 11:16 PM   #1122
v-bro is offline v-bro  Netherlands
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Freaking wonderful! What amp do you use to drive them?
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Old 1st February 2007, 11:42 PM   #1123
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Quote:
Originally posted by v-bro
Freaking wonderful! What amp do you use to drive them?
The lines are driven with a nakamichi 730 (1 of 4 I've rebuilt) @ 125wpc... the sonosubs are driven with a modified Adcom 555 II efficiency is probably around 92 - 94 dB, and they're a pretty easy load to drive.

John L.
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Old 2nd February 2007, 01:48 AM   #1124
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John L,

Your speakers look super
The mid-ribbons look home made.?? Maybe if you have the time you can start a thread with some details of your project and more pics.
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Old 2nd February 2007, 09:27 PM   #1125
v-bro is offline v-bro  Netherlands
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That would be really nice...
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Old 2nd March 2007, 04:28 AM   #1126
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Location: kansas city mo, and on occasion, around the world ...
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some here

http://www.flickr.com/photos/audiomn/190338096/

http://www.flickr.com/photos/audiomn/
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Old 13th March 2007, 06:14 PM   #1127
Gollum is offline Gollum  Canada
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A completed project of Zaph's BAMTMdesign. I've built the vented 2 cuft floorstander. I don't have to say how good it sounds !

The original diyaudio thread is here .

There is also a picture gallery covering every steps of the building process here .

Regards,

Dino
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Old 20th March 2007, 03:32 AM   #1128
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Here is my value-based system. They are active (DCX 2496) 3-way loudspeakers.

They are crossed at 160 (4th order LR lowpass, 1st order highpass)
and 1500 Hz (4th order LR high and low).

Amps from bottom to top (frequency-wise) are a Pioneer SX-1050 (120 w, $10 at thrift store), a NAD 304 (35 w), and a TDA7265 chipamp (25 w). The amplifiers are hidden in a closet behind the wall.

Woofers are Usher 15HMs in sealed 6.5 cubic foot enclosures with EQ (F3 ~30). I bought the drivers off of ebay from non-other than Vance Dickason. I paid $150 for the pair! The enclosures in a former life were department store display stands. I bought them for $6 and added a layer of 3/4 MDF. With the concrete plinths they weigh about 150 lbs each. I had the for thought to not permanently attach the plinths.

Coaxials are SammiSound CX12AW200Gs (PE buyouts) in open baffles. The Sammis sound pretty good with the steep XO. They don't sound as hot with a typically 2nd/3rd order XO. The open baffles weigh in at 50 lbs each.

Sources are a DVR and media center PC; both are using digital outputs. Processor is a Technics AC-300 ($25 ebay).

Click the image to open in full size.
Click the image to open in full size.

More pictures can be found here: http://www.flickr.com/photos/rogerle...448607/detail/

WAF is extremely low... Especially considering we have a 500 square foot apartment.

Cheers,
Roger
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Old 20th March 2007, 03:46 AM   #1129
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Excellent work! How does it sound?
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Old 20th March 2007, 11:39 PM   #1130
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Thanks MJL,

I would say that it is a pretty good all around system with clean output and plenty of headroom. They don't sound like your typical towers. They look big and they sound bigger.

The bass is dynamic and clean. The Ushers are very nice drivers. I wouldn't mind getting another pair of them and running them push-pull. With twice the displacement I could also safely get another half-octave of frequency response. Or possible try a hybrid sealed/open baffle combo like Geenius.

The Sammi coaxials aren't the most dynamic speakers I've ever heard, but they are pleasant sounding, image well, and are extremely efficient. on the downside they beam on axis. I need to experiment some with acoustical treatments on my back wall.

The compression unit matches well with the TDA7265 amp, There is lots of detail, low distortion, low noise. From bobbing my head around in the nearfield they seem to integrate well with the woofers. On paper they doesn't go past 15K, but neither do I. I found a French DIYer who reported good results after modifying the compression unit. I might attempt it if I get bored and/or brave. Here is the link:
http://translate.google.com/translat...icrosoft:en-us
The google translation makes me chuckle.

Roger
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