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Old 6th March 2011, 09:20 PM   #1
MREM is offline MREM  United States
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Default Trying for a near flat response from 80hz to 17khz

I hope this is the right place for this.

The drivers I have in mind

Eminence Kappalite 3015 for the woofer

---15 inch neo driver

Eminence NSD:2005-8 for the compression driver

---1 inch throat size

The crossover I have in mind

Eminence PX2:1K6

---2 way crossover with a 1600hz crossover point

-----------------------------------------------------

The question

So anways, my point of confusion is this. The graph in the pdf spec sheet for the 15 inch woofer shows the driver falling off fast at about 150hz.

But, I would assume that the enclosure used could have a significant effect on this.

That being said, using the above parts (or comperable parts), what exactly would I have to do to get flat down 80hz? What size enclosure? How much internal volume in the enclosure?

------------------------------------------------------

Additional info

This is a pro audio speaker cabinet.

The enclosure will be vented and the compression driver and woofer will be mounted into the same enclosure......your typical woofer and horn cabinet.

------------------------------------------------------

Any help appreciated.

Thanks
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Old 6th March 2011, 09:47 PM   #2
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the tweeter alone won't work without a horn or waveguide attached to it .
That said , the mouth aperture of a horn /WG and geometry should fit for the chosen crossover frequency . If you look at PE catalog ,under WG you'll see the Dayton ones ,and I think you'll need bigger than 12" to match the woofer.
If you fear of the response of the big woofer at higher frequencies ,you can choose two smaller ones
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Old 6th March 2011, 10:13 PM   #3
MREM is offline MREM  United States
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Quote:
Originally Posted by picowallspeaker View Post
the tweeter alone won't work without a horn or waveguide attached to it
I understand that and I do have a horn picked out.

I didn't mention it since it didn't seem to pertain to my question.

I have the whole thing figured out other than the woofer playing down to 80hz. I am sure can do it, I just need to figure out how.
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Old 6th March 2011, 10:15 PM   #4
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No way a 15" woofer and a 1" tweeter can cover eficiently the whole bandwith required. At the 1.6 kHz crossover you will have big problems.

Last edited by SoNic_real_one; 6th March 2011 at 10:17 PM.
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Old 6th March 2011, 10:28 PM   #5
MREM is offline MREM  United States
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Quote:
Originally Posted by SoNic_real_one View Post
No way a 15" woofer and a 1" tweeter can cover eficiently the whole bandwith required. At the 1.6 kHz crossover you will have big problems.
What crossover point do you suggest?

How big of an exit/throat should the compression driver have? 2 inches?

Last edited by MREM; 6th March 2011 at 10:55 PM.
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Old 7th March 2011, 12:36 AM   #6
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Looks like a box volume of 1.8 cu.ft and a 6" port ,6.1" long will get you in the ballpark. Fairly flat from 80hz to 1k. Power dip @ 100hz @ second impedance spike. Really good group delay (<6ms)and minimal cone excursion(<1mm thru passband), +/-3dB from 75-1khz, +126dB. I don't know how well winISD does freq response above 500hz, so you may have to model this one yourself, hope this helps though,or you could try up to a 3.5 cu.ft box with good results of course group delay and power response will get worse.
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Last edited by Top Shelf; 7th March 2011 at 12:42 AM.
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Old 7th March 2011, 01:22 AM   #7
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Maybe if budget allows you could try the eminence PSD 3006-8 , the 3" VC will allow better power handling @ the bottom of the passband .
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Old 7th March 2011, 01:32 AM   #8
bwaslo is offline bwaslo  United States
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You might want to take a look at the Econowaveguide threads over at Audio Karma and at TechTalk.
Zilch's AK Design Collaborative - Econowave Speaker - AudioKarma.org Home Audio Stereo Discussion Forums
Flex Your PCD Mettle: - Techtalk Speaker Building, Audio, Video, and Electronics Customer Discussion Forum From Parts-Express.com
Various people mentioned in those have done builds similar to yours, though using a 15inch woofer is pushing it.
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Old 7th March 2011, 10:17 AM   #9
Helmuth is offline Helmuth  Netherlands
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Quote:
Originally Posted by MREM View Post
I hope this is the right place for this.

The drivers I have in mind

Eminence Kappalite 3015 for the woofer

---15 inch neo driver

Eminence NSD:2005-8 for the compression driver

---1 inch throat size

The crossover I have in mind

Eminence PX2:1K6

---2 way crossover with a 1600hz crossover point

-----------------------------------------------------

The question

So anways, my point of confusion is this. The graph in the pdf spec sheet for the 15 inch woofer shows the driver falling off fast at about 150hz.

But, I would assume that the enclosure used could have a significant effect on this.

That being said, using the above parts (or comperable parts), what exactly would I have to do to get flat down 80hz? What size enclosure? How much internal volume in the enclosure?

------------------------------------------------------

Additional info

This is a pro audio speaker cabinet.

The enclosure will be vented and the compression driver and woofer will be mounted into the same enclosure......your typical woofer and horn cabinet.

------------------------------------------------------

Any help appreciated.

Thanks
Buying drivers with flat response is a good starting point.

Only most hobbyist do not see that phase faults of a normal XO and reflections on the baffle do cause non linearity of the loudspeaker as a system.

So nice drivers isn't the guaranty of a near flat response in a multi way. It is more complex.
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Old 7th March 2011, 02:02 PM   #10
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Check out the Four Pi at link below that uses the Omega 15 and PSD 2002 with a similar crossover point.
Possibly you can buy the crossover from Pi Speakers and adapt it to your speaker design. There is a wealth of information there that will help you if you so desire to use it.

Pi Speakers - unmatched quality and state-of-the-art performance

Good luck in your search!
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