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Need help on 4Pi speakers [message #71289] Wed, 08 February 2012 06:49 Go to next message
gilstone is currently offline  gilstone
Messages: 7
Registered: February 2012
Esquire
Hello to everyone,

I'm interested on the 4Pi speakers using DE250 & JBL 2226h drivers.
I have a few questions:

1) I have a very small living room, kindly refer to my floor plan below.
(The red colour drawing is my sofa and the blue one is the 4Pi speakers)
The listening distance is less than 3 meters, is 4Pi suitable for near-field listening?
Will this cause listening fatigue?

2) There are no side walls in my living room to reflect the sound wave from the 4Pi speakers, will this greatly reduce the bass output?

3) I'm planing to use Almarro A205A(5 wpc) with 4Pi, is it suitable?
I'm more worry on the LF side, does my low powered Almarro able to drive the JBL 2226h efficiently?

4) For the DE250 one inch throat, there are different type of horn mouth size to choose. Any differences on mouth size? Square or rectangular?
Also the material used for the horn? Plastic or cast aluminum?


Thanks for reading my post.


Regards,
Gilbert
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Re: Need help on 4Pi speakers [message #71290 is a reply to message #71289] Wed, 08 February 2012 09:49 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18786
Registered: January 2001
Illuminati (33rd Degree)

Answers by numbers:

1. These speakers sound good even in very small rooms. I've had a pair in a small bedroom for years, and they sound great. It's also the size of the rooms at trade shows, which are less than ideal, of course, but our room sounds very good every year.

2. Our matched-directivity loudspeakers do not depend on side walls or corners like our constant directivity cornerhorns do. You will want to set them up with flanking subs, like shown in the photos below. This will not only provide greater extension, but will also smooth room modes.

3. Five watts is plenty. We have customers that run on half that much power, with good results. Again, you will want to use flanking subs for modal smoothing, and this also give greater extension. The flanking subs will have their own separate amplifier.

4. The horn is plastic. It has a round throat that exactly matches the DE250 compression driver.


http://lonestaraudiofest.com/2009/Photos/PiSpeakers_10.jpg
four π speakers flanked with three π subs


http://lonestaraudiofest.com/2009/Photos/PiSpeakers_02.jpg
Closeup of left speaker and its flanking sub
Re: Need help on 4Pi speakers [message #71310 is a reply to message #71290] Thu, 09 February 2012 07:49 Go to previous messageGo to next message
gilstone is currently offline  gilstone
Messages: 7
Registered: February 2012
Esquire
Thank you Wayne for the reply.

A couple more questions:

5) Does the 4Pi needs damping material for the internal speakers cabinet?
What type of damping material do you recommend?

6) Which cable gauge to use for wiring up the internal of 4 Pi speakers?
10, 12, 14, 16, 18 or 24 (AWG) ?

7) In my country, JBL 2226h driver cost about US$1350 a pair.
It is worth(in term of sound quality) to pay such a premium price?

Please email me the 4Pi speakers plan.


Have a nice day.

Regards,
Gilbert
Re: Need help on 4Pi speakers [message #71314 is a reply to message #71310] Thu, 09 February 2012 08:01 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18786
Registered: January 2001
Illuminati (33rd Degree)

5. Use R13, lining the rear, top and side nearest the port. Also put a steet on the cross-brace, spanning the cross-section.

6. 16 guage

7. Absolutely

You've got mail!

Re: Need help on 4Pi speakers [message #71483 is a reply to message #71314] Thu, 23 February 2012 09:12 Go to previous messageGo to next message
gilstone is currently offline  gilstone
Messages: 7
Registered: February 2012
Esquire
Hi Wayne,

Please email me the 3pi subwoofer plan, i might want to integrate it with the 4pi speakers.

Thank you.

Regards,
Gilbert
Re: Need help on 4Pi speakers [message #71484 is a reply to message #71483] Thu, 23 February 2012 09:16 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18786
Registered: January 2001
Illuminati (33rd Degree)

You've got mail!

Re: Need help on 4Pi speakers [message #71508 is a reply to message #71484] Fri, 24 February 2012 00:43 Go to previous messageGo to next message
gilstone is currently offline  gilstone
Messages: 7
Registered: February 2012
Esquire
Hi Wayne,
I think i have received the wrong plan.
I'm requesting for flanking sub (3Pi subwoofer) plan.
Please send me plan.

Thanks & Regards,
Gilbert
Re: Need help on 4Pi speakers [message #71509 is a reply to message #71508] Fri, 24 February 2012 08:01 Go to previous message
Wayne Parham is currently offline  Wayne Parham
Messages: 18786
Registered: January 2001
Illuminati (33rd Degree)

Sorry, I've resent.

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