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Class D Switching Power Amplifiers and Power D/A conversion

The New Hypex Fusion Plate amps
The New Hypex Fusion Plate amps
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Old Yesterday, 04:25 AM   #1661
Davey is offline Davey  United States
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Join Date: Dec 2001
Location: Bremerton, WA.
Quote:
Originally Posted by mlee View Post
Yes I was not clear. Lower qts = more eq. Perhaps I'm mistaken but I thought you'd need some reasonable watts to driver the L26RO4Y woofer to reasonable SPL and Xmax given it is around 86dB?
You would need a significant amount of power IF you were trying to maintain Xmax as you went up in frequency. In these dipole applications though, you're not.
Drive voltage drops at a significant rate with increasing frequency owing to the dipole correction, low-shelving Q equalization and low-pass filter associated with the woofer/mid crossover.
Generally, power amplifiers with nominal ratings in the 50 watt range will be just fine.

FYI, the L26RO4Y driver requires a shelving Q-correction of about +10db centered at 35Hz to achieve an effective Qts = 0.5.

Dave.

Last edited by Davey; Yesterday at 04:31 AM.
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Old Yesterday, 04:45 AM   #1662
mlee is offline mlee  Canada
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Quote:
Originally Posted by Davey View Post
Drive voltage drops at a significant rate with increasing frequency owing to the dipole correction
Perhaps it might be better to take this discussion in another thread or PM as to not wanting to clutter this thread with off topic. Please feel free to drop me a private message to sort this out as my understanding of amplifier power is different.

It is my understanding due to dipole cancellation you'll need EQ to bring the low frequencies (for example 35hz) up to the same SPL as the midrange and tweeter. I have a small baffle and require at least 16dB eq to bring the lower frequencies up. 16dB eats a lot into the 100watt budget.
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Old Yesterday, 05:17 AM   #1663
Davey is offline Davey  United States
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Join Date: Dec 2001
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For open-baffle setups it requires X amount of power to push Driver-X to Xmax, at a particular frequency.....whether you're using EQ or not.
In other words, the power requirement is completely independent of any EQ (dipole, Q-correction, whatever) requirement.

Don't think of it in terms of matching sensitivity to a midrange or tweeter. That's irrelevant.

Does that make sense??

Feel free to PM if you like.

Dave.

Last edited by Davey; Yesterday at 05:31 AM.
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Old Yesterday, 07:54 PM   #1664
mlee is offline mlee  Canada
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Hi All,
After a bit of back and forth with Dave, I did a little experiment to verify his words. I ended up using at best 50 Watts according to the oscilloscope and that was loud. I don't think I could push it more so..........

For OB I'm only using at best 50 Watts into a relatively generous xmax woofer. Sealed is not OB so I apologise in saying larger wattage is ok for me as it seems I not really using the wattage for the OB application. If I was then hearing damage would probably occur.

Thanks for your patience Dave.
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