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Old 24th June 2013, 10:43 PM   #1
rka is offline rka  United States
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Default MiniPlay

I finished building an interesting pair of speakers yesterday. Thought some others might be interested and decided to share them with you. I found the design on a German web site (http://www.einklang-audio.com/images...ay/bauplan.jpg). The DIY form site (Bauplan: MiniPlay mit Vifa 9BG 119/8 oder Visaton FRS8, Lautsprecher - HIFI-FORUM) provided information about the design and build.

The drivers used in the version I built are the Visaton FRS 8 - 8 Ohm driver (NOT the FRS 8M-8 Ohm) that I purchased from MCM for a few pennies less than $10 each. I used modestly priced hardware and what amounted to scraps laying around my shop (living room). All but the top and base were cut from a piece of 1/2"-5 ply X 2' wide X 4' long. I deviated from the original design by mounting the drivers internally and making the top of the cabinet removable in order to accomplish this.

Here's the part that I like: they sound pretty darn good. How good? A lot better than I ever expected for less than the $30 I spent on materials.

Roemhild, the designer (see: Schematic: Mini Play with Vifa 9BG 119/8 or Visaton FRS8 at Bauplan: MiniPlay mit Vifa 9BG 119/8 oder Visaton FRS8, Lautsprecher - HIFI-FORUM) deserves some kind of award for what can be accomplished for so little.

Roger
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Old 25th June 2013, 02:02 AM   #2
rka is offline rka  United States
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Default MiniPlay Pictures

Some pictures
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Old 25th June 2013, 02:30 AM   #3
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Hi RKA. That's a great looking build, nice work
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Old 25th June 2013, 10:28 AM   #4
xrk971 is online now xrk971  United States
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This is a good candidate for a Foam Core build. It looks like a BVR, correct? Yes, nice work there, RKA.
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Old 25th June 2013, 12:28 PM   #5
IG81 is offline IG81  Canada
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These are cute little big-vent reflex! They are similar to a small BVR I almost built for FF85WK, but instead went with a BLH.

Click the image to open in full size.

Click the image to open in full size.

I was thinking as of late to build the BVR, although somewhat modified from the above, with rear-mounted driver and a 1"-1.5" deep 45 chamfered waveguide to add some presense when loaded quasi-quarterspace on a desktop and backwall.

IG
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Old 25th June 2013, 04:30 PM   #6
rka is offline rka  United States
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Default BVR?

Quote:
Originally Posted by xrk971 View Post
It looks like a BVR, correct?
Oh god, all this confusing terminology. No doubt it would help if I understood the underlying "fisics." I do recall reading one of Martin King's papers where he discusses the influence of Q total on the response of the horn. Of course, I couldn't find it and every thing else looked like I had never seen it before. Maybe a little more would sink in if I read it again, but my gut feeling on all this technical stuff is that it provides guidelines rather than absolutes and the rest is left to high art and perseverance. Having neither leaves me in a quandary: to build or not to build, that is the question: Whether 'tis nobler in the mind to suffer the slings and arrows of outrageous fortune, or to take arms against a sea of troubles, and by opposing end them? What the hell, all I wanted was a cheap, not to difficult way to avoid being offended by the sound that issues forth.

For the sake of actually caring about labels, if only a little, (and I do have the greatest respect for those among us that do understand the behavior of air molecules and are able to predict with whatever level of accuracy what these little devils are going to do when kicked in the *** with a substantial jolt from that so simple electromechanical device [aka, driver], I am in awe of such ability).

I humbly bow before you.
Roger
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Old 25th June 2013, 04:43 PM   #7
xrk971 is online now xrk971  United States
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BVR is big vent reflex. Basically designed and tuned like a bass reflex but with a 'horn' or wave guide to help boost the bass output. As opposed to a back loaded horn where chamber is smaller and horn length is much longer. BVR's can sound really good as you see first hand.
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Old 2nd July 2013, 11:52 AM   #8
SarkkaS is offline SarkkaS  Finland
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Looked interesting enough for me to print out a picture and start making an adaptation of this idea in 3D CAD. I have some 18 mm material in need of a project and this might fit the bill. The main idea is to plop these on my desk at work, accompanied by a small D-class amp.

-Sale
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Old 3rd July 2013, 11:22 PM   #9
freddi is offline freddi  United States
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that looks nice and fun - I converted my 5 cubic foot reflex to a stubby horn port in 1967 - ran a McGee 6.5" dual cone with "double magnet" - lol - had bass - wonder with hornresp if there's an 8" today which would work in a fat BVR that big??
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Old 4th July 2013, 10:47 AM   #10
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High art? Nope. Leave that to the artists. Horn theory was a well understood science by ~1930, although Keele & Leach took a lot of the fun out of it back in the '70s by relating the physics to T/S & thereby instantly simplifying the design process.

A BVR is a back horn. It's simply a matter of degree.
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