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/projekt/miniplay/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
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
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.
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
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
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
BVR?
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
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
Attachments
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.
A BVR is a back horn. It's simply a matter of degree.
I know there's more to it, but "at a glance" - does this give a fair enough representation of the concept?
I'll gladly take it off or correct if wrong - would not want to mislead future readers.
IG
To an extent, although for e.g. you can get BR boxes with very long vents (not necessarily recommending, since the longer you go, the more the 1/2 wave harmonic structure rears its head, just saying). The basic point though is that whatever the nomenclature, they all at a fundamental level operate under common physical principles.
Yes, long vents are not impossible indeed, but they'll tune so ridiculously low by then that one would want to augment the CSA and it will slowly morph into a TL of sorts by this point and transition from ½-wave to ¼-wave operation as the chamber become proportionally smaller and is seen as a termination of the line.
But yeah, I get the point. Whatever one builds, it can be placed where it fits on that graph and given any manner of fancy name.
Trademark office lines will be red. IG
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