Multiple drivers in MJK's sheets?

GuyPanico · 30th May 2005, 10:13 PM

Do I simply multiply the vas by the number of drivers I'm using? When I do this the graph moves out of the range of the chart. Anybody have any suggestions?

RJ · 30th May 2005, 11:09 PM

For two drivers I double the Vas, Halve the Re & Lvc, and double the Sd. I don't know if this is the correct way in MJK's worksheet, but that's the way I do it. The final product comes very close to the simulation.
Maybe Mr. King will jump in and give us his advice.
I also try three different positions for Driver Position Ratio to get an approximate idea how two drivers affect the response curve.

MJK · 30th May 2005, 11:48 PM

If you look under the General Speaker Related Articles link, you will find a short write-up and an example of how to do this type of modeling

Hope that helps,

GuyPanico · 31st May 2005, 12:14 AM

Thanks MJK. What i'm actually thinking about doing is making a line array TQWT. The TQWT will be on it side and folded. Modelling 9 drivers that are power tapered might prove difficult.

MJK · 31st May 2005, 01:30 AM

Modeling two drivers, located closely together, along a TL or TQWT is an approximation that is probably not too bad. Modeling a line array using my MathCad worksheets is definitely not very accurate. Different drivers are going to see different pressures and velocities on their back sides depending on where thay are located along the line. I would not recommend this method of modeling, a more exact worksheet that accounts for multiple drivers in different positions would be required.

GuyPanico · 31st May 2005, 02:28 AM

I'm too hard headed to not give it at least one blind try.

If nothing else it will be a fun project. Which is what this whole cheapo array was supposed to be

RJ · 31st May 2005, 02:46 AM

I'm somewhat as crazy as you. I recently tried 2 - 5 1/4" drivers in a 112" TL. The box was 20 1/2" high 11" wide and 16 1/2" deep. It had 5 baffles inside to give it a tapered 112" length and a 3" round port 3/4" long for the terminus.
Dang if it didn't have some good bass that went down into the 40's.
The midrange doesn't sound as great. It might be that I have it crossed too high - 3500 hz.
I'm going to try a tweeter that'll go as low as 1500 hz. but that won't be til July.

Lot's of luck on your's, Rudy

30th May 2005, 10:13 PM	#1
GuyPanico diyAudio Member Join Date: Mar 2005 Location: Euless, TX	Multiple drivers in MJK's sheets? Do I simply multiply the vas by the number of drivers I'm using? When I do this the graph moves out of the range of the chart. Anybody have any suggestions?

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30th May 2005, 11:09 PM	#2
RJ diyAudio Member Join Date: Oct 2004	For two drivers I double the Vas, Halve the Re & Lvc, and double the Sd. I don't know if this is the correct way in MJK's worksheet, but that's the way I do it. The final product comes very close to the simulation. Maybe Mr. King will jump in and give us his advice. I also try three different positions for Driver Position Ratio to get an approximate idea how two drivers affect the response curve.

30th May 2005, 11:48 PM	#3
MJK Account disabled at member's request Join Date: Feb 2002 Location: Clifton Park, NY	If you look under the General Speaker Related Articles link, you will find a short write-up and an example of how to do this type of modeling Hope that helps,

31st May 2005, 12:14 AM	#4
GuyPanico diyAudio Member Join Date: Mar 2005 Location: Euless, TX	Thanks MJK. What i'm actually thinking about doing is making a line array TQWT. The TQWT will be on it side and folded. Modelling 9 drivers that are power tapered might prove difficult.

31st May 2005, 01:30 AM	#5
MJK Account disabled at member's request Join Date: Feb 2002 Location: Clifton Park, NY	Modeling two drivers, located closely together, along a TL or TQWT is an approximation that is probably not too bad. Modeling a line array using my MathCad worksheets is definitely not very accurate. Different drivers are going to see different pressures and velocities on their back sides depending on where thay are located along the line. I would not recommend this method of modeling, a more exact worksheet that accounts for multiple drivers in different positions would be required.

31st May 2005, 02:28 AM	#6
GuyPanico diyAudio Member Join Date: Mar 2005 Location: Euless, TX	I'm too hard headed to not give it at least one blind try. If nothing else it will be a fun project. Which is what this whole cheapo array was supposed to be

31st May 2005, 02:46 AM	#7
RJ diyAudio Member Join Date: Oct 2004	I'm somewhat as crazy as you. I recently tried 2 - 5 1/4" drivers in a 112" TL. The box was 20 1/2" high 11" wide and 16 1/2" deep. It had 5 baffles inside to give it a tapered 112" length and a 3" round port 3/4" long for the terminus. Dang if it didn't have some good bass that went down into the 40's. The midrange doesn't sound as great. It might be that I have it crossed too high - 3500 hz. I'm going to try a tweeter that'll go as low as 1500 hz. but that won't be til July. Lot's of luck on your's, Rudy

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