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Old 10th June 2012, 05:20 PM   #51
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Originally Posted by Bob Brines View Post
Using two drivers in the same frequency band is fraught with difficulties. The comb filtering will destroy the top end. I have not and will not consider doubling the A7's. This does not apply to the bass drivers because the wave lengths are substantially larger than the driver CTC dimension.

Also note that I am not trying to build a death metal speaker. Regardless of whether the A7's can do a continuous 95dB, and that combined with the output of the bass drivers should give at least 85dB 2m out. That's ear damage territory. If the A7's can actually produce 90dB 2m out, then there should be ~40dB dynamic range with an average home's noise floor.

The fact that the twin 8's ar more efficient than a single A7 is irrelevant as I consider bi-amping mandatory. The use of two 8's is produce a large surface area and therefore a sharper wave front on bass transients.

Bob
Bob,

I respect and understand your point here but as we both know " The math shows a bumble bee should not fly, but it does". I listen primarily too classical not Death Metal and in my naivete I must try it and hear for myself if I like it, or do I hear a phase/delay anomaly that is intolerable. Just trying to get choral and symphonic swings too manage better not constant ear splitting volumes. I will try it and let everyone know if it works for me!

Also, drivers are rolled off @ 12db starting at 100hz and subs entering at 120-140 Hz and go down to 25Hz.

Thanks, Ramon
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Old 10th June 2012, 06:49 PM   #52
Octavia is offline Octavia  United States
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Ramon please share your findings when you implement those other 7.3's. By the way what sub drivers are those?
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Old 10th June 2012, 08:26 PM   #53
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The subs are NHT Sub Two's with two 10 inch driveers and one 250 watt Carver/Sunfire
plate amp per cabinet. They also come with a separate cross over box that allows vol, phase, and freq adjustments in low, high and fixed frequencies. They have been extremely useful and sound quite good from 21-200 Hz.
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Old 11th June 2012, 12:47 PM   #54
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Found a digital Radioshack SPL-meter for sale cheaply in Stockholm. Will take a few weeks for me to get it but when I do we'll see how loud I actually play with my EL70. It will be very interesting to find out
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Old 11th June 2012, 07:00 PM   #55
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For an example, in this video clip I play my EL70eN very loud. They're crossed over at ~90Hz and at around 4:03 and forward you can see the excursion. Is that a safe volume level or am I pushing them too hard?
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Old 11th June 2012, 07:08 PM   #56
chrisb is offline chrisb  Canada
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Originally Posted by Rullknufs View Post
Found a digital Radioshack SPL-meter for sale cheaply in Stockholm. Will take a few weeks for me to get it but when I do we'll see how loud I actually play with my EL70. It will be very interesting to find out

don't be surprised if C weighted fast averages clock in not much above lower 90's -
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Old 13th June 2012, 04:28 PM   #57
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Hope this is not off topic, but will a BIB/Alpair 7.3 single driver per cab manage decibel swings too 90 db 2.5 meters away in a moderately damped 13x21ft room? For classical not Throbbing Gristle!

Thanks,

Ramon
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Old 13th June 2012, 08:20 PM   #58
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Quote:
Originally Posted by Monte Verdi View Post
Hope this is not off topic, but will a BIB/Alpair 7.3 single driver per cab manage decibel swings too 90 db 2.5 meters away in a moderately damped 13x21ft room? For classical not Throbbing Gristle!

Thanks,

Ramon
This, of course, is exactly my problem. I like to set my speakers in an 8' equilateral triangle, and that's pretty close to 2.5m. As a reference, yesterday I had Dvorak's 7&8 playing. I took out the SPL meter on my trusty iPhone and got just under 80dB for the forte's. Another 10dB is what I am looking for to handle transients.

The A10's will make this volume in spades, but we have already had that discussion. I suppose I will have to get a pair of A12p's once they are available.

Bob
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Old 14th June 2012, 06:04 AM   #59
Swifty is offline Swifty  Netherlands
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Quote:
Originally Posted by Bob Brines View Post
This, of course, is exactly my problem. I like to set my speakers in an 8' equilateral triangle, and that's pretty close to 2.5m. As a reference, yesterday I had Dvorak's 7&8 playing. I took out the SPL meter on my trusty iPhone and got just under 80dB for the forte's. Another 10dB is what I am looking for to handle transients.

The A10's will make this volume in spades, but we have already had that discussion. I suppose I will have to get a pair of A12p's once they are available.

Bob

Hi Bob, did the alpair play full range? And playing louder than that caused, what? Audible distortion?
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Old 14th June 2012, 12:26 PM   #60
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I agree that this seems to be the critical question. Bob's scenario pretty much matches my typical listening w/ classical or jazz and I wouldn't consider it very demanding or unusual.

If the 7.3s can't handle this type of music/listening, what exactly is their expected "mission"?



Quote:
Originally Posted by Bob Brines View Post
This, of course, is exactly my problem. I like to set my speakers in an 8' equilateral triangle, and that's pretty close to 2.5m. As a reference, yesterday I had Dvorak's 7&8 playing. I took out the SPL meter on my trusty iPhone and got just under 80dB for the forte's. Another 10dB is what I am looking for to handle transients.

The A10's will make this volume in spades, but we have already had that discussion. I suppose I will have to get a pair of A12p's once they are available.

Bob
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