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Multi-Way Conventional loudspeakers with crossovers

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Old 4th September 2011, 05:02 PM   #1991
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Post The Leftovers

My latest creation is a pair built to donated to a charity auction. They sell used audio equipment to raise funds for reading services for the blind. The goal was to make as good a pair as I could using as much leftover stuff as I could, hence the name.

  • Woofers: Vifa P17WJ-00-04 in a Chebychev alignment. That's ~21 liters with a port tuned to ~45Hz.
  • Tweeters: Sinar Baja (SB Acoustics)TD25NH-05-08 1 pair in series per speaker.
  • Cabinets: 3/4" MDF screwed and glued together with lots of internal bracing and some damping in the back. Covered with vinyl veneer.
  • X-over is made from what I had available, plus some resistors I had to buy. 2nd order centered at ~625Hz.
The X-over is not optimal, so I built it on a barrier strip so it can easily be changed. I designed a much better X-over, then included plans including component sources.

Images are the speakers, the X-over, and SPL plots of woofer and tweeters without X-over. Test equipment used is: HOLM Impulse for farfield SPL measurements, Dayton's WT3 for impedance, and Audata's SpeakerWorkshop to model the enclosure and the X-over.
Attached Images
File Type: jpg the leftovers completed.JPG (63.8 KB, 2679 views)
File Type: jpg X-over photo.JPG (47.9 KB, 2621 views)
File Type: bmp whole speaker FR no X-over.bmp (90.3 KB, 74 views)

Last edited by ByronInPortland; 4th September 2011 at 05:09 PM.
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Old 4th September 2011, 06:15 PM   #1992
mns80 is offline mns80  Finland
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Hi there,
Not my first build, I have built several sub enclosures for my cars but my first home speaker build. It all started out with reading the F5 thread and building an dyi F5, can be found HERE. As I had listened to my new great amplifier on my cheap Simex speakers I came to the conclusion that I had to do something about the speakers.
I went to the local speaker shop for a couple of visits and listenend to some speakers and came to the conclusion that I had to pay myself sick for a couple of speakers that I really liked.
After this I started to search for a diy solution and after a lot of searching and reading found a speaker that I wanted to build, the DTQWT mk II designed by Troels Gravesen.
The boxes themselves were quite easy but as I wanted to do the painting myself, first time, it took some serious time.
They sound really good and balanced to me with the F5, the mids are excellent and the top is perfectly integrated, the two deltalines on the back you do not even notice. Maybe that is why I would like some more crounch in the bottom end but not much, so if you have ideas of how to accomlish this I'll be all ears. Please enjoy!

Attached Images
File Type: jpg 5.jpg (138.3 KB, 2648 views)
File Type: jpg 6.jpg (127.2 KB, 2543 views)
File Type: jpg 1.jpg (188.7 KB, 2476 views)
File Type: jpg 2.jpg (79.4 KB, 1117 views)
File Type: jpg 4.jpg (54.3 KB, 918 views)
File Type: jpg 3.jpg (84.9 KB, 1155 views)
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Old 4th September 2011, 08:09 PM   #1993
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Quote:
Originally Posted by ByronInLawrence View Post
...X-over is made from what I had available, plus some resistors I had to buy. 2nd order centered at ~625Hz.
625 Hz??

dave
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Old 10th September 2011, 06:01 PM   #1994
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Yeah, about 625Hz. They don't sound that great, but I listened a lot at decent levels without blowing the tweeters. It will suffice until the lucky buyer builds a better one.

MNS80: That paint job is amazing! And you first time! Maybe some day I'll try finishing speakers like that.
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Old 17th September 2011, 06:02 AM   #1995
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Click the image to open in full size.


Bass: Diy Sep amp 6550:Tru-sonic 150w sealed enclosure (500Hz)
Mids: Diy Set amp 300B:Edgar Midrange Tractrix Horn with JBL LE5-2 (500Hz-5Khz)
Hi: Diy Set amp 71A: Selenium 220ti HM 17-25 horns or Eminence APT-200 (>5Khz)
Diy Electronic crossover
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Old 17th September 2011, 11:54 AM   #1996
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mns80, I'm jealous. I'm working on a silver flute 8" with that horn, but using the threaded version with a jbl 2407a, crossover at 2khz. I've heard the horn with a jbl 2408 and that horn (with or without threads) is special.

Norman
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Old 19th September 2011, 03:11 AM   #1997
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not finished, not at all.

Click the image to open in full size.

Norman
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Old 19th September 2011, 03:19 AM   #1998
TerryO is offline TerryO  United States
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Quote:
Originally Posted by norman bates View Post
mns80, I'm jealous. I'm working on a silver flute 8" with that horn, but using the threaded version with a jbl 2407a, crossover at 2khz. I've heard the horn with a jbl 2408 and that horn (with or without threads) is special.

Norman
Norman,

That's pretty cool. What are your plans for bass?

Best Regards,
TerryO
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Old 19th September 2011, 03:36 AM   #1999
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Thanks terr.

hmm, those silver flutes are awesome, but a low, low qts. I don't believe in the manufactorer's qts spec of .2, but .25 - .3 wouldn't suprise me.

I thought of a baffle step woofer, but my guy hates them and prefers to run a passive cut circuit between preamp and amp (you can see something like it on the esp site). And I got the higher sensitivity 4ohm to match the 4ohm jbl compression driver. So a baffle step woofer would make for a punishing load, and would sound bad at a diyIowa (used an AR tube amp years ago).

I have a vega 12" that goes real low in its box (v12f) and of course the dual 15's (I have 2 boxes each with eminence 15lf's).

Right now, I'm not using any woofers/subwoofers with my klipsch rb75.

I have no idea if I will stay with mono/stereo, add another amp with the 80hz f-mod I have, someday build a sealed ppsl (push pull slot loaded subwoofer) or spring for a cheapie onkyo dolby digital reciver (least likely). I got to get my altec 9440a up and running. I'm quite happy without much woofing (for now). I've been doing the diy patch cord thing and have been focused there. Next up is the speaker wire thing (that I've done long ago b4 also). But my 26g magnet wire with plastic rat shack rca's beat out 24g twisted pair soft silver with canare rca's.

Hopefully speaker boxes are done in a week or so, then maybe 2 weeks till crossover is knocked out.

Norman

Last edited by norman bates; 19th September 2011 at 03:45 AM.
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Old 25th September 2011, 09:15 PM   #2000
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I just finished this. B&C drivers. Simple 2 way with third order passive crossover. Special thanks to AllenB for help with the crossover. Exterior wood is wavy birch. They sound good so far.
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File Type: jpg L1020120-sm.JPG (479.0 KB, 448 views)
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