Two different drivers in the same box

Tyimo · 13th December 2010, 08:27 PM

Hi!
I saw sometime that two different drivers (in size and Qts) was built in the same box volume. I saw it in Bass reflex,TQWT and BLH boxes too.
- How can I calculate such a speaker?? With average Ts parameters??

Another question:
- Is it possible that two different drivers in a BLH speaker share in the same horn section? (The back chambers has different size, but the horn lenght in a section or the mouth is the same.)

Tyimo

PeteMcK · 13th December 2010, 09:26 PM

see Thorstens method here:
http://www.fortunecity.com/rivendell...d/dddllqd.html
I've used it on a pair of reasonably similar 6" drivers in a 2.5 way & it worked well.

PeteMcK · 13th December 2010, 11:41 PM

Here's the guts of it, without the waffle:
For the parameters of a compound driver,
Add the Vas and Sd of both Drivers,
The new Fs, Qes, Qms, becomes the geometric mean of the two drivers values, (square the actual two values, add them up, divide by two and then take the square root).
The Voice Coil DCR (Re) are paralleled. (Unless you decide to put them in series)

River757 · 14th December 2010, 06:21 AM

Years ago, many designers felt comfortable having drastically different drivers share the same volume (more sensitive hobbyists may not want to view the photograph in the following thread

): scroll down to post #15

The good ol' days weren't always all that good............

Tyimo · 14th December 2010, 10:28 AM

Quote:

For the parameters of a compound driver,
Add the Vas and Sd of both Drivers,
The new Fs, Qes, Qms, becomes the geometric mean of the two drivers values, (square the actual two values, add them up, divide by two and then take the square root).
The Voice Coil DCR (Re) are paralleled. (Unless you decide to put them in series)

Thanks! This I thought.
Now only one question is remained:
-Is it possible that two different drivers in a BLH speaker share in the same horn section? (The back chambers has different size, but the horn lenght in a section or the mouth is the same.)

Tyimo

dangus · 15th December 2010, 12:31 AM

There were a couple of Speakerlab systems with dissimilar woofers. The S7WA with a 10" and 12" driven in parallel electrically in a single chamber. The model 30 which used 10" and 8" woofers in a single chamber, but with a patented Nestorovic coupling network which decouples the 10" woofer at lower frequencies.
Low range loudspeaker system - Patent 3984635
This discussion about Vandersteen speakers also mentions that patent:
Vandersteen 2C: Room for improvement? [Archive] - AudioKarma.org Home Audio Stereo Discussion Forums

13th December 2010, 09:26 PM	#2
PeteMcK diyAudio Member Join Date: Feb 2002 Location: Sydney	see Thorstens method here: http://www.fortunecity.com/rivendell...d/dddllqd.html I've used it on a pair of reasonably similar 6" drivers in a 2.5 way & it worked well. __________________ ‘today… there lives alongside the twentieth century the tenth or thirteenth. A hundred million people use electricity and still believe in the magic power of signs and exorcisms” Trotsky

13th December 2010, 11:41 PM	#3
PeteMcK diyAudio Member Join Date: Feb 2002 Location: Sydney	Here's the guts of it, without the waffle: For the parameters of a compound driver, Add the Vas and Sd of both Drivers, The new Fs, Qes, Qms, becomes the geometric mean of the two drivers values, (square the actual two values, add them up, divide by two and then take the square root). The Voice Coil DCR (Re) are paralleled. (Unless you decide to put them in series) __________________ ‘today… there lives alongside the twentieth century the tenth or thirteenth. A hundred million people use electricity and still believe in the magic power of signs and exorcisms” Trotsky

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13th December 2010, 08:27 PM	#1
Tyimo diyAudio Member Join Date: Nov 2002 Location: Hungary	Two different drivers in the same box Hi! I saw sometime that two different drivers (in size and Qts) was built in the same box volume. I saw it in Bass reflex,TQWT and BLH boxes too. - How can I calculate such a speaker?? With average Ts parameters?? Another question: - Is it possible that two different drivers in a BLH speaker share in the same horn section? (The back chambers has different size, but the horn lenght in a section or the mouth is the same.) Tyimo

14th December 2010, 06:21 AM	#4
River757 diyAudio Member Join Date: Nov 2010 Location: Houston, Texas	Years ago, many designers felt comfortable having drastically different drivers share the same volume (more sensitive hobbyists may not want to view the photograph in the following thread ): scroll down to post #15 The good ol' days weren't always all that good............

15th December 2010, 12:31 AM	#6
dangus diyAudio Member Join Date: May 2004 Location: Vancouver Island	There were a couple of Speakerlab systems with dissimilar woofers. The S7WA with a 10" and 12" driven in parallel electrically in a single chamber. The model 30 which used 10" and 8" woofers in a single chamber, but with a patented Nestorovic coupling network which decouples the 10" woofer at lower frequencies. Low range loudspeaker system - Patent 3984635 This discussion about Vandersteen speakers also mentions that patent: Vandersteen 2C: Room for improvement? [Archive] - AudioKarma.org Home Audio Stereo Discussion Forums

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