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Multi-Way Conventional loudspeakers with crossovers

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Old 20th January 2013, 05:02 AM   #51
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Hi Mike, I've had enough of a play with akabak to know that I'd like to become proficient in using it, but like you I really haven't had the time to do so. There is actually a good dummy's guide here on diyAudio which is enough to get going with simple projects.

Perhaps when I start to think about new cabinets for my Vifa M26WR-09-08's I may get a bit more into it. I'd like to model a double chamber reflex.

Tony.
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Old 20th January 2013, 07:20 AM   #52
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Yes, didn't take long to get to 49-50hz (rounded vent strips)

I though the way it went together was good/fast. I cut a dado around the top and bottom plates and then nailed the back/sides on - then clamped vertically while the glue dried.

The goal is to make the dado just deep enough for the side panel and vent strip (mdf) thickness.
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Old 20th January 2013, 01:03 PM   #53
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Thought it best to make template for the vents (the 1st set were beltsanded).

This is pretty simple, just attached to work piece and flush with router.

Going to play one all day here - then check tuning (-; (-;
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Old 20th January 2013, 02:18 PM   #54
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New Pic:

Sounds good - using same xo as before; had to use 10ohm R for balance.

No damping material - not sure any is needed.
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Old 20th January 2013, 03:02 PM   #55
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I admire your woodworking skills. I have no experience with the vents you did but they do look great.

I suggest you try my crossover. It should sound quite different.

Also, line the inside with fiberglass wool or some other suitable material. Without it, the mids will sound harsh.
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Old 20th January 2013, 03:13 PM   #56
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Quote:
Originally Posted by wintermute View Post
Perhaps when I start to think about new cabinets for my Vifa M26WR-09-08's I may get a bit more into it. I'd like to model a double chamber reflex. Tony.
Hi Tony

Double Chamber Reflex are not very popular but they have their attributes. The main advantage of a DCR is in the Mid-Bass. It is actually a combination of a BandPass and a Bass Reflex.

I manually calculate the DCR with the help of Claudio Negro website. When I did a FR sweep with LMS, it's quite accurate.
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Old 20th January 2013, 03:21 PM   #57
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yes - have some cork pieces, will also add some light damping material.

The wool cone has a very nice sound (I thought it might), not really having any mid problems as is.
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Old 20th January 2013, 04:29 PM   #58
ODougbo is offline ODougbo  United States
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Mike,

Can order parts Monday, what gauge wire should I purchase for the inductors?

Also the large resistor with the (BSC I guess); picked up 50ohm the other day (not expensive) will that work?
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Old 20th January 2013, 07:08 PM   #59
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I standardize all my inductors with 18 AWG air core types.

50 ohms is fine. I usually use 10W for testing. Once final, I switch to 20W.

If the 0.95mH is unavailable, you can use 1.0mH.

This network is a Bass Shelving Filter, not really a BSC. I like to hear mid-bass in my music. If the lower bass (like 40Hz) is a bit lacking, I can always add a Sub later.
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Old 21st January 2013, 09:36 AM   #60
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Okay Mike,

Found 16G coils for woofer(s), the $36 meter that I just bought came in handy!
Going to make a temp wood strip and set inside box - I can use the tweeter xo from the other xo while waiting for tweeter parts.
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