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I mean the ones that use a DC motor to drive push pull woofers.Parts are easy to obtain these days. What should one look for in a motor?
Scott
Edits: 10/09/14Follow Ups:
Doing an entirely DIY effort can be difficult. I've no experience with the Rhythmic, but that might be a way to go (?) to avoid some of the complexity needed to get lots of control while staying stable.
From what I found when I made mine, the big benefit isn't harmonic distortion (only a slight effect, really) or frequency response (lots of effect, but you could do that with an equalizer instead).
What it does best is to avoid compression (loss of efficiency due to heating). Servo makes the sub sound like it has endless dynamic output, kind of like a high-efficiency giant box sub does. Compression isn't a distortion (as usually thought of). It's a reduction of the sensitivity at the fundamental frequency and the servo can be a very effective way of handling that.
Please give a link for what you are talking about.
A DC motor driving a cone? That sounds extremely complicated.Not impossible but you would need one hell of a motor controller.
Are you sure you have seen something like this? If this is true it is news to me.
I am building a box for the RYTHMIK 15" driver which uses a purposefully simple servo circuit. Will only be using it below 40 Hz when it is done. Cannot comment on how well it performs. Needless to say I hope it performs well. (I said it anyway)
About half way down the page.
Thanks for the directions.
I remember long ago Mr. Danley getting in trouble with the moderators about this. I had no idea what the controversy was until this very moment.
Still cannot imagine this being a DIY project.
Thigpen's device is very expensive and my experience with Mr. Thigpen indicates to me that is what it costs to make such a thing. I doubt there are very many DIY folks who can make one of those things, certainly not one worth listening to. Probably not too hard to make a BOOM BOOM device but not one that can play music.
I would love to experience the Thigpen device!
I have a pair of Rhythmic Audio 15's downstairs in my HT setup, but I haven't experimented with many subs before. What little I know about the solution that servo is trying to serve, seems like it using an electrical solution to the driver's distortion. Seems like djk's PPSL would do a better job with a mechanical solution.
I think the corollary is with acoustics. It is better to treat and set up your room correctly rather than use brute force DSP. Maybe it is just my bias but I think the electrical solutions are the last thing to try.
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"When Khruschev said "we will bury you" I don't think he meant with surplus parts." zacster
they tend to have a resonant frequency and favor one note. I don't like that, although you can EQ them.
Motor, passive radiator and robotic like parts have all improved since the originals were built.
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