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Speaker Asylum General speaker questions for audio and home theater. |
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Speaker Asylum General speaker questions for audio and home theater. |
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In Reply to: Normally I'd say if within one octave of FS, steep 18 or 24db, but dynaudio often can be pushed. posted by Edp on June 4, 2012 at 09:40:04:
Edp and Presto, thank you very much for the reply. My question was, has anyone ever built one of these enclosures? (I'm sure they have, but for whatever reason they aren't reading my post.)
I do realize what you are saying. My intent isn't necessarily to try to lower Fs, but rather to increase output (even by 1 dB) in the range from 600 to 1000 Hz (besides lowering harmonic distortion slightly)...precisely so I would NOT need a contouring or overlapping curve in the crossover filter. I should have mentioned that I would indeed want to make the x-over at least 12dB/octave electrical, but possibly even 24dB/octave electrical, my bad. With the woofers in an MTM arrangement, but spaced apart a bit...ideally 12 dB/octave electrical for both low and high pass might have the smoothest transition between widely spaced drivers. For this, the acoustic crossover point would likely not fall below 750 Hz.
As for the power handling, I'm not sure it would be affected that much. Certainly the only way the midrange would receive more than 150 watts rms or so, is if the woofers are getting maybe 600 watts rms into 8 ohms. The woofers I am considering using, are only rated for about 100 watts rms (this will be a pair of 8 ohm woofers in parallel)...so I don't see the midrange dome ever getting more than maybe 80 watts rms, on music or effects material laden with very dynamic or loud midrange signal (and this would likely only be if I actively crossed over the speaker to subwoofers, which I won't always be doing).
More typical would be 20 to 30 watts rms to the midrange (when running this system full range with an amp up to 300 watts rms)...and certainly when I use the speaker with lower powered tube amps, power handling will obviously be even less of an issue. And this is if the midranges don't need to be padded down any...but they likely will need at least 1 to 2 dB. So again, this isn't an FOH concert system or active studio monitor in a theater or concert-hall-sized mixing suite...I really don't see power handling being an issue.
I know Dynaudio Acoustics has used this dome in their biggest studio systems which claim peak spl of nearly 130 dB...but they also actively cross over the M560D to about 3 kHz, and the Esotar tweeter at 5 or 6 kHz, in order to achieve this. So in that system, the midrange gets almost no bandwidth to itself, and is crossed over as if it were a tweeter.
In Dynaudio's home systems, such as the previous-generation Confidence 5 (from the 1990's to early 2000's), the M560D was crossed over at a much lower 1 kHz, with only a 6 dB passive filter. And this is, I assume, with the standard rear cup installed. The interior volume would be large if this were a 1 inch tweeter...but I think a 2 inch midrange deserves more volume, especially this one.
I feel confident my idea of the larger rear enclosure (perhaps a tapered transmission line made of layered MDF) will work well. I just would like to learn how to go about designing the shape and size. And especially, how to go about dissolving the glue that holds the small metal rear cup on, to remove it...without melting the speaker!
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Follow Ups
- that may well be...however... - CarlEber 12:03:09 06/05/12 (3)
- Actually, you want a higher Fc and Qtc - badman 15:32:11 06/15/12 (1)
- RE: Actually, you want a higher Fc and Qtc - CarlEber 19:47:27 06/22/12 (0)
- I would first attempt your theory on a cheaper mark, I don't think it will do what you wish. - Edp 11:03:24 06/06/12 (0)
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