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Phy-HP KM30 SAG Infinite Baffle

99.113.129.206
Posted on February 24, 2015 at 14:02:06
datman
Audiophile

Posts: 458
Location: South Central
Joined: May 27, 2002
Contributor
  Since: September 12, 2002
 I am building a new sound room and am going to use a pair of PHY KM30 SAG drivers in an infinite baffle. The speakers will be mounted in a wall with a 600 cubic foot space behind them. From what I have been able to figure out, this should work well.

I am planning to use a product called Durisol to build the partition wall. This is a concrete/fiber mixture that is sold in block forms like cinder blocks. It is VERY inert and should not have a problem with flexing or sound transmission. I am going to mount the drivers on bronze panels that will be built into the wall.

Since Durisol comes in depths of 6" to 14" and 24" widths, I am thinking of using the 6" material to finish the walls inside my new room, making the sound room very tight and non resonant. The infinite baffle is a different problem.

Is there any particular reason the infinite baffle itself needs to be lined with the Durisol material or will something less fancy work? The space is about 600 cubic feet in size and will probably have to be air conditioned to protect the drivers from heat as I live in South Louisiana.

The listening room will be air conditioned as well, so ambient noise won't be a problem.

Never having played with an infinite baffle before, does ths sound like it will work?

 

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RE: Phy-HP KM30 SAG Infinite Baffle, posted on February 25, 2015 at 06:49:07
Scott L
Audiophile

Posts: 353
Location: Knoxville
Joined: February 2, 2001
 While an infinite baffle is quite an effective approach for sub woofing,
especially with drivers in an opposed reaction-formation plenum,
This PHY driver does not merit use in such an application. Sure, it needs
a large volume, but not 600 cubic feet for the pair.

 

RE: Phy-HP KM30 SAG Infinite Baffle, posted on February 25, 2015 at 08:02:40
Hornlover
Manufacturer

Posts: 2529
Joined: March 8, 2002
 The 'enclosure' should not need it.

 

RE: Phy-HP KM30 SAG Infinite Baffle, posted on February 25, 2015 at 13:41:58
hottattoo
Audiophile

Posts: 141
Location: New York
Joined: July 30, 2011
 Sounds like you put a lot of thought into your project. You are talking about a lot of weight and construction--- you better be VERY sure that the sound you get is what you will be happy with for a long time.

What happens if you change your mind or not totally happy with the sound ?

Are you making provisions for subwoofers ? Unless the 600cu.ft. is "dead" space, that is a lot of space to give up IMHO. Good luck with your project !!!

 

RE: Phy-HP KM30 SAG Infinite Baffle, posted on February 25, 2015 at 14:48:00
datman
Audiophile

Posts: 458
Location: South Central
Joined: May 27, 2002
Contributor
  Since: September 12, 2002
 I'm not too worried about liking or not liking the sound. The Phy drivers are from a pair of Musical Affairs speakers that I already own, so I am quite familiar with how they sound.

The infinite baffle space is actually a 5 x 15 x 8 foot storage space at the rear of the structure that will be used for storing storm shutters and Christmas stuff, so the space won't be wasted. All I have to do is install an airtight door.

 

RE: Phy-HP KM30 SAG Infinite Baffle, posted on February 26, 2015 at 09:04:57
hum4god
Audiophile

Posts: 55
Location: wisconsin
Joined: October 22, 2004
 hi
i remember Peter Daniel from audiosector using the Fertin fullrange drivers in infinite baffles with very good results .

 

with all the costs why buy a restricted range cone driver instead of putting a pair of QUAD , posted on February 27, 2015 at 02:18:51
Timbo in Oz
Audiophile

Posts: 23221
Location: Canberra - in the ACT - SE Australia
Joined: January 30, 2002
 dipole electrostatics in. Seriously.

Far more accurate and musically precise. IF you need even louder deep bass than the bass enhanced larger versions, add some long-throw high-Q large-frame >/= to 15" bass drivers running from below 40Hz.

But, don't high pass filter the QUADs.






Warmest

Tim Bailey

Skeptical Measurer & Audio Scrounger


 

PHY's own demo-listening room has PHY drivers in IB., posted on March 1, 2015 at 01:46:14
hagustos
Audiophile

Posts: 212
Location: Izmir
Joined: August 6, 2002
Check the link first, it's better to ask PHY for the details.

Good luck,
Hakan

Link:

 

If you need louder, deeper bass, posted on March 1, 2015 at 22:36:37
jusbe
Audiophile

Posts: 5950
Location: North Island
Joined: April 4, 2000
 stack 'em!


Big J

"... only a very few individuals understand as yet that personal salvation is a contradiction in terms."


 

Disagree, stacked FREDs in an infinirte baffle won't image., posted on March 2, 2015 at 01:49:04
Timbo in Oz
Audiophile

Posts: 23221
Location: Canberra - in the ACT - SE Australia
Joined: January 30, 2002
 two point sources per channel?

think, and then think again.


Warmest

Tim Bailey

Skeptical Measurer & Audio Scrounger


 

Nothing to do with bass though, is it?, posted on March 2, 2015 at 21:44:25
jusbe
Audiophile

Posts: 5950
Location: North Island
Joined: April 4, 2000
 Besides, your imaging needs and experience aside, this is a perfectly serviceable solution and recommendation that has suited better ears than yours or mine. And there's nothing absolute in matters of taste, dear sir.



Big J

"... only a very few individuals understand as yet that personal salvation is a contradiction in terms."


 

Stacked 57s work well but I cannot imagine anyone stacking 63s or their later iterations, why throw away the ., posted on March 2, 2015 at 22:11:51
Timbo in Oz
Audiophile

Posts: 23221
Location: Canberra - in the ACT - SE Australia
Joined: January 30, 2002
 whole design idea of a phase and time coherent point-source? So, why not use 57s?

I've heard 3 pairs of 57s stacked vertically in an arc, as well as the usual two pairs in an arc.

The best was 2 pairs in a double-width panel per side and from floor to ceiling angled back and with a Decca horn in the middle at ear height. With 15" dipole subs top and bottom. 5 amps per channel and 1st order PLL crossovers except for the LP to the subs which was active 4th, no HP on the QUADs. Subs were eq'd 1/3rd octave.











Warmest

Tim Bailey

Skeptical Measurer & Audio Scrounger


 

"better ears than yours or mine" , posted on March 2, 2015 at 22:18:09
Timbo in Oz
Audiophile

Posts: 23221
Location: Canberra - in the ACT - SE Australia
Joined: January 30, 2002
 How the hell can you know that?


Warmest

Tim Bailey

Skeptical Measurer & Audio Scrounger


 

Sounds cool. Wish they were mine! nt, posted on March 2, 2015 at 23:20:01
jusbe
Audiophile

Posts: 5950
Location: North Island
Joined: April 4, 2000
Big J

"... only a very few individuals understand as yet that personal salvation is a contradiction in terms."


 

It's obvious, posted on March 2, 2015 at 23:22:43
jusbe
Audiophile

Posts: 5950
Location: North Island
Joined: April 4, 2000
 that it's not proven nor provable. Just kicking up audiophile dust! That said, I know my hearing has turned out to have been decent over the years and so I've given up wondering whether I need to prove it or not. And you seem to know your beans.

Big J

"... only a very few individuals understand as yet that personal salvation is a contradiction in terms."


 

RE:I have a pair in their flashy packing crates in my store room where they fit best into my house., posted on March 14, 2015 at 09:13:09
amnesiac
Audiophile

Posts: 717
Joined: August 21, 2002
 for many years. As I cant afford a room big enough to make them sing.

 

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