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Mounting Woofer [message #18254]

Thu, 10 November 2005 16:20

SteveBrown
Messages: 330
Registered: May 2009

Grand Master

Well, I've decided to build something bigger than I started out wanting, a 3.5 ft box with a JBL 2226 and JBL horn. As I'm working on the cabinets I'm wondering if I should flush mount the woofers. I'm using 3/4" plywood, but could double up the front baffle if needed. Also, any thoughts on bracing?
Thanks!

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Next Question... [message #18255 is a reply to message #18254]

Thu, 10 November 2005 16:46

SteveBrown
Messages: 330
Registered: May 2009

Grand Master

As I plan the layout of the front baffle, I'm worried that there isn't enough room. I've thought to put the horn on top, which is fine with me and allows for easy experimenting down the line. At any rate, the baffle is 17.75 x 26.5, overall box is 1.5" taller and wider. I need to also accomodate two 4" ports. I can cram all this on the front, but wondering if that is the smartest idea. Also, is there a minimum distance from the port to the woofer? If I put the horn on top, how close to it should I try to mount the woofer?
Thanks!!

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oops, forgot... [message #18256 is a reply to message #18255]

Thu, 10 November 2005 16:47

SteveBrown
Messages: 330
Registered: May 2009

Grand Master

The horn is a JBL 2370A, which is 6.8" high by 17.5" wide. Woofer is a 2226, 15.25" wide.

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Re: oops, forgot... [message #18259 is a reply to message #18256]

Fri, 11 November 2005 08:41

Wayne Parham
Messages: 18682
Registered: January 2001

Illuminati (33rd Degree)

You can place the port close to the woofer, but try to place it so that midrange reflections aren't directed out the port. Position it so the entrance angle won't allow a straight shot, because that will provide attenuation of the midrange in the port. You can also use absorbent stuffing to help absorb midrange energies inside the chamber. You'll also want to position the port and driver in the cabinet so standing waves don't setup a resonant node, but it sounds likle the size of cabinet and port will make this pretty unlikely. That's usually more of a concern when the box is large and/or the port is long.

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Re: oops, forgot... [message #18261 is a reply to message #18259]

Fri, 11 November 2005 08:58

SteveBrown
Messages: 330
Registered: May 2009

Grand Master

Thanks, Wayne!

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Re: oops, forgot... [message #18266 is a reply to message #18256]

Sun, 13 November 2005 20:10

jimbop
Messages: 60
Registered: May 2009
Location: Colorado Springs, CO

Viscount

Steve, what driver are you using with the JBL horn?

Jim D

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It is the 2426 (nt) [message #18267 is a reply to message #18266]

Mon, 14 November 2005 04:28

SteveBrown
Messages: 330
Registered: May 2009

Grand Master

(nt)

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Re: Mounting Woofer [message #18268 is a reply to message #18254]

Mon, 14 November 2005 06:58

jimbop
Messages: 60
Registered: May 2009
Location: Colorado Springs, CO

Viscount

Steve, I'm curious - in your original post you mentioned having used Pi Thermionic 3's but said they had low "WAF" and poor imaging. How do you see this new speaker differing from the Pi 3's? How did you decide on this combination?

I am on a similar quest to yours, and have been following your threads with great interest. Also, where are you purchasing your JBL components?

Jim Dombrowski

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Re: Mounting Woofer [message #18269 is a reply to message #18268]

Mon, 14 November 2005 07:37

SteveBrown
Messages: 330
Registered: May 2009

Grand Master

Jim, excellent question! I had a chance to listen to a set up at Ron's (spkrman57)house and thought it was awsome (used JBL 2226 on the bottom and JBL drivers w/Edgar horns on top). The Thermionic 3pi uses Eminance drivers and I'm hoping that the JBLs are part of the answer to a better overall sound. The combo I'm building also has a bit smaller foot print than the old speakers (at about 3.5 ft3). I really like what horns do in terms of dynamics, so trying another horn design, especially with Ron's help, is compelling. And, at the end of the day, if I don't like them for Hi-Fi, I'll use them for home theater. Oh, last, in terms of space, I've been relocated to the basement where space and WAF isn't as big of an issue as it was when I was trying to make something work for the living room... of course that does not mean I have complete freedom (sigh).

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Re: Mounting Woofer [message #18270 is a reply to message #18269]

Mon, 14 November 2005 08:54

Wayne Parham
Messages: 18682
Registered: January 2001

Illuminati (33rd Degree)

I think the biggest difference will come from upgrading the midwoofer. The JBL 2226 is a significantly better (and more expensive) driver. There's a world of difference between the Pro series and the Thermionic series in both price and performance.

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