i need advice on a woofer 96/100db flat to 80hz 8" or 10" (carbon or aluminium cone if possible) , anyone ?
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Yup. Eminence Deltalite 2515 II will do it. Probably go a little below that too, but be prepared to build a big box.
MCM's store brand pro woofer will do it in a 12" (97 db) and almost do it in a 10" (95 db). I have a previous revision of the MCM 12, and I've been told it should be crap, but it's plenty of fun in my garage from about 45 hz to 2 khz, ported in about 4.5 cuft (I think). I haven't used the newer versions. Dayton pro 10" and 12" speakers are a little more expensive with similar numbers if the MCMs are too cheap for ya.
But I'm a cheapskate with a tin ear and a cheap amp screwing around in my garage. You might want to spend more $$$.
RCW took me to task, telling me about how I should use a QB5 alignment to get crazy volume down to 80 hz in my build thread about my garage speakers. It might apply to whatever you end up with. See here:
http://www.diyaudio.com/forums/multi-way/154305-xo-help-cheap-pa-drivers.html
Edit: ah... I see you are not in the US. Perhaps the alignment info will still be useful, however.
But I'm a cheapskate with a tin ear and a cheap amp screwing around in my garage. You might want to spend more $$$.
RCW took me to task, telling me about how I should use a QB5 alignment to get crazy volume down to 80 hz in my build thread about my garage speakers. It might apply to whatever you end up with. See here:
http://www.diyaudio.com/forums/multi-way/154305-xo-help-cheap-pa-drivers.html
Edit: ah... I see you are not in the US. Perhaps the alignment info will still be useful, however.
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http://www.faitalpro.com/img/products/schede/FHS/10FH520/10FH520_datasheet.pdf
No idea how trustworthy the specs are though.
No idea how trustworthy the specs are though.
What is "flat"? Does it include baffle step loss? If so, what size baffle?
Sealed, Bass Reflex, or something else for the enclosure? What size enclosure? What tuning freq. if Reflex (or similar)?
What sort of upper freq. response do you want?
In any event.
Aluminum (in a quality design) is highly unlikely, Carbon (in most variations other than additive to paper) is also unlikely, but not as unlikely as Aluminum.
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Well then we'll probably have to disappoint you I'm afraid. You're asking for something physically impossible...
Assuming a sealed box, half space conditions and an F3 of 80 Hz, you'll need at least a 12" driver to get the desired 96 dB sensitivity. If you want 100 dB, you'll need approximately 18". For full-space you'll need to double up on radiating area, of course. A bass-reflex system will raise your theoretical maximum sensitivity for a given radiating area and F3 with about 3 dB.
If 10" is your maximum size, you'll have to aim for slightly less sensitivity or a higher F3.
Assuming a sealed box, half space conditions and an F3 of 80 Hz, you'll need at least a 12" driver to get the desired 96 dB sensitivity. If you want 100 dB, you'll need approximately 18". For full-space you'll need to double up on radiating area, of course. A bass-reflex system will raise your theoretical maximum sensitivity for a given radiating area and F3 with about 3 dB.
If 10" is your maximum size, you'll have to aim for slightly less sensitivity or a higher F3.
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box can be sealed or reflex , i dont need too low tunning cause i have subs , but i´d like to have a good response above 80hz , below 80 i cross to subs
Personally I would never use a bass reflex system for a satellite system crossed at 80 Hz. This would require a steep crossover with high group delay to prevent the driver from being mechanically overloaded below the tuning frequency.
A 10" woofer in a bass reflex may meet your sensitivity requirement by the way, I had not considered that just yet. However, I would rather choose the 12" and a sealed box, or perhaps two 8-10" drivers with a lower sensitivity?
How about this: http://www.aespeakers.com/drivers.php?driver_id=5 or two of these: http://www.davis-acoustics.com/les-haut-parleurs/serie-carbone/25-gc10r
A 10" woofer in a bass reflex may meet your sensitivity requirement by the way, I had not considered that just yet. However, I would rather choose the 12" and a sealed box, or perhaps two 8-10" drivers with a lower sensitivity?
How about this: http://www.aespeakers.com/drivers.php?driver_id=5 or two of these: http://www.davis-acoustics.com/les-haut-parleurs/serie-carbone/25-gc10r
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Again, baffle step loss?
Upper freq. bandwidth?
..it's easier if you only want it 80-400 Hz.
It depends on the driver and the implementation.
Basically a driver with a Qts between .5 and .7, a moderate fs (below 60 Hz) and a tuning freq. around 50 Hz all in a small volume (near 1 cubic foot).
It gives some gain centered around 125 Hz to compensate for some baffle-step loss. The added group delay is often around 1 ms only at 100 hz when compared to a similar volume in a sealed enclosure. It also tends to let the driver "breath" more easily (..better depth and low-level detail).
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What box size can the project tolerate? I think it would be better to approach the problem from a box size limitation rather than a driver size limitation.
Try modeling this one around 50 Hz (tuning freq.) with 2 cubic foot enclosure:
FaitalPRO - Professional Loudspeakers Made in Italy
It won't be "flat" as modeled, but the minor rise from 250 Hz to 80 Hz should be welcome.
..group delay (when compared to a sealed enclosure of half that volume) should be virtually the same to 100 Hz, with only a marginal increase in time below 100 Hz (..about 1 ms added at 80 Hz).
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