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Old 17th June 2013, 09:09 PM   #1
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Default Help with "half boominator"

Hi.

Iam try to make a "half boominator"

Was thinking about buying
Monacor
2x HT-88
2x SPA-110PA
Trying to learn the program WinIsd but i kinda suck.
But when i use a 30l box tuned at 82hz i get a peak around 145hz would this be good for outdoor use? or am I completely way off


/ Noob from Sweden
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Old 17th June 2013, 10:49 PM   #2
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Try Unibox, it's easier to use - I get 70L tuned to 50Hz as a good starting point,
30L is too small to get low bass, & 82Hz is tuned too high, 60Hz would be more like it
A reasonable compromise is 50L tuned to 55Hz
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Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency
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Old 17th June 2013, 11:31 PM   #3
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Is it possible for you to wait until the right drivers for the build is in stock again?

As far as I can tell ljudia.se will have them in stock 15th of July.

They are after all both cheaper and far better drivers.

Also you can't use those tweeters, you need something with very wide dispersion in all directions. 80 to 100 degree radial dispersion is optimal.
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Old 18th June 2013, 10:20 AM   #4
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Thanks for the quick replies.

Would like to wait for the HP-10W but would E10-150S work instead?
With P.audio PHT-411 or P.audio PHT-406
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Old 18th June 2013, 10:51 AM   #5
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Or how about:

Monacor SPA-10PA
Monacor MHD-190
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Old 18th June 2013, 11:08 AM   #6
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Fortunately a wiki exist.

Boominator

If you want a Boominator, half or full, to function as intended, only the drivers specified therein will do the job.

And yes, I have tested all of the above and dozens more.
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Old 19th June 2013, 12:32 AM   #7
Dissi is offline Dissi  Switzerland
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Quote:
Originally Posted by JohanG View Post
But when i use a 30l box tuned at 82hz i get a peak around 145hz would this be good for outdoor use? or am I completely way off
No, you are not way off. If each woofer has only 15 litres I get exactly the same result. The peak at 150 Hz and the roll-off below is not really good. Try to get a flat response down to 100 Hz or lower. High efficiency 10" drivers usually need rather large volumes to work in bass reflex. The SPA-110PA requires 30 to 70 litres and the HP10W even a bit more.

I don't know your desired cabinet size. But 10-15 litres per woofer seem to be reasonable for a portable loudspeaker. Please check the Monacor SPA-8PA. It offers great performance for little money, only the range from 1 to 4 kHz is problematic.

MONACOR INTERNATIONAL : New products
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Old 19th June 2013, 05:58 AM   #8
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Quote:
Originally Posted by Dissi View Post
No, you are not way off. If each woofer has only 15 litres I get exactly the same result. The peak at 150 Hz and the roll-off below is not really good. Try to get a flat response down to 100 Hz or lower. High efficiency 10" drivers usually need rather large volumes to work in bass reflex. The SPA-110PA requires 30 to 70 litres and the HP10W even a bit more.
Maybe you should read the Boominator and learn that flat tuning does not equal good when we talk speakers used outdoors. Especially if you tune to Q=0.707 it will have hopelessly inadequate bass performance. Standard box tunings are meant for different sized indoors listening rooms, not free-field settings. Diffrent requirements altogether.
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