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Old 24th December 2012, 01:58 AM   #251
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Originally Posted by Melo theory View Post
You would need 75 drivers at 3" with 2.5mm xmax to reach 99db at 80Hz
That's 6db down LR alignment, which will give you 105db reference level.
You will need very high ceilings. About 30ft.

(I know you are thinking about those vifa's)
Remember that for a line source you can not figure the SPL as you would a point source, and the SPL vs distance is 1/r vs 1/r^2 for a point source. Take a look at radiation from a cylinder for an approximation.
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Old 24th December 2012, 02:02 AM   #252
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Yeah, but the fresnel zone changes with frequency and at 80Hz it needs to be pretty tall.
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Old 24th December 2012, 02:15 AM   #253
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(I know you are thinking about those vifa's)
You sure got me there Jason
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Old 24th December 2012, 02:22 AM   #254
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You could do 9 vifa's at 175Hz LR alignment.
At 99db max excursion.
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Old 24th December 2012, 02:26 AM   #255
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Here, have a look at the dipole off axis polar plots for a 3" driver.
Desktop Dipole Monitors
Edit: sorry, you've already seen those
I'm getting confused, I picked the wrong week to quit sniffing glue
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Last edited by Melo theory; 24th December 2012 at 02:28 AM.
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Old 24th December 2012, 02:28 AM   #256
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Originally Posted by Melo theory View Post

You could do 9 vifa's at 175Hz LR alignment.
At 99db max excursion.
That certainly looks VERY much more doable. Still low enough to be not crossing in the critical vocal range and low enough to cross before the peak of typical H-frame of 200 Hz.

Thanks a lot for doing the excursion calculations. Which calculator are you using if I may ask
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Old 24th December 2012, 02:37 AM   #257
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Originally Posted by soundaatma View Post
That certainly looks VERY much more doable. Still low enough to be not crossing in the critical vocal range and low enough to cross before the peak of typical H-frame of 200 Hz.

Thanks a lot for doing the excursion calculations. Which calculator are you using if I may ask
It's low enough. The bell telephone frequency starts at 300Hz.
Anyway, I don't think there is a problem with crossing over at any frequency, it's the reflections from lobing at the crossover that bothers listeners. People get so hung up on keeping the crossover out of the vocal range. I don't hear any ill effects as long as the crossover maintains a great vertical polar response and there is no phase or group delay issues.
As far as an H frame, just make it shallower and give up a little extension. Dipoles can't get down that low in rooms anyway......40hz is about it in most rooms.

Here is the calculator.
http://www.baudline.com/erik/bass/xmaxer.html
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Last edited by Melo theory; 24th December 2012 at 02:46 AM. Reason: Spell check can kiss my little hiney!
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Old 24th December 2012, 03:41 AM   #258
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Hi John,

This is probably FAQ #542, but given the significant savings of the NaO Note IIRS over the NaO II, can you recommend any budget amplifiers for the NaO Note II RS?

I finally upgraded from my very good but hum-and-buzz (own DIY fault) Rod Elliot P3A amplifiers to excellent but not extravagent commercial amplifiers for my NaO II, but have you any experience with any single-box 8 channel amplifiers ?

regards,
Thanh
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Old 24th December 2012, 12:42 PM   #259
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Originally Posted by tktran303 View Post
Hi John,

This is probably FAQ #542, but given the significant savings of the NaO Note IIRS over the NaO II, can you recommend any budget amplifiers for the NaO Note II RS?

I finally upgraded from my very good but hum-and-buzz (own DIY fault) Rod Elliot P3A amplifiers to excellent but not extravagent commercial amplifiers for my NaO II, but have you any experience with any single-box 8 channel amplifiers ?

regards,
Thanh
I'm not big into experimenting with amps. I'm using a pair of Adcom 7605 amp for the moment. They are rated at 125/8, 175/4 and robust enough to driver a pair of XLS or XXLS woofer connected in parallel. Another less expensive option might be the Class D Audio amps. I have a couple of CDA 254L kits that I bought a while ago to build a pair of stereo amps. They are $225 each and include a power supply and transformer that is supposed to be able to drive 4 channels. I plan of getting another pair of the CDA 254 boards ($145 each) and making those amp 4 channels each. They are rated at 125/8, 250/4.
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Old 24th December 2012, 12:56 PM   #260
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Originally Posted by tktran303 View Post
*** can you recommend any budget amplifiers for the NaO Note II RS?***
What about an inexpensive 6-channel amp (there are lots of "whole room audio" amps of sufficient power for this task out there used, as well as new) for the tops, and a bigger separate 2-channel amp for the woofers?

I'd be tempted to use one of the newer Class D "pro" amps for the woofers, such as the Crest ProLite 2.0 or Crown XLS1500.
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