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Old 24th November 2012, 02:44 PM   #11
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Here is the same charts but the JBL's tuning added.
Big difference but still acceptable for music (I guess).

IMHO I would take the drop in response and let room gain compensate for it.
And a lower bass extension with a lower group delay at 30Hz for music use as well.
Were as my tuning shows a 4Hz lower response at 26.3Hz for the same delay.
The JBL tuning is not bad as well as I didn't even look at it until now.
But I personally don't really consider anything below about 25hz to 30hz to be of any use for music although some do.

Cheers !!

jer
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File Type: jpg JBL Response.jpg (108.7 KB, 34 views)
File Type: jpg JBL Group Delay.jpg (92.7 KB, 36 views)

Last edited by geraldfryjr; 24th November 2012 at 02:53 PM.
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Old 24th November 2012, 03:30 PM   #12
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I would Like to see some THD measurements of this driver if anybody has some they would like to post.

Or any of the other JBL series as well.

I was going to get some of GTO 1204's or 1214's back a few years ago and now I wish I had, As inflation has really taken a hit on raw drivers lately.

jer
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Old 24th November 2012, 03:34 PM   #13
djn is online now djn  United States
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Thanks for your work Jer, it looks like these will work very well for my purposes. I don't do HT so it is music only and these will actually be 3rd and 4th subs in the room. When Joe handed me these, I took them to be polite.....I'm glad I did!

P.S., you should stop by if you are ever in Waterford area. Cheers, Dennis.
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Old 24th November 2012, 04:14 PM   #14
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Cool, Thanks Dennis, if you are ever out here in the Jackson area feel free to get a hold of me in a PM and I will give you my info.
And we can visit and show you my setup as I can't drive at the moment.

I think those subs will work nicely.
I had 4 x 12's and 4 x 10's going of some average speakers but sadly I just lost 3 of the 12's.
It would reach 110db tight and clean when it all was working right.
Here is a picture of my system after I had just rebuilt it.
I don't have any big ESL's made yet.

jer
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Old 24th November 2012, 09:05 PM   #15
djn is online now djn  United States
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Nice looking stack Jer. I don't get over to your area often but if I do, I'll be sure to PM up first. Are you looking for ESLs? I have a friend here local that has panels for sale but they need the power supplies built for them.
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Old 24th November 2012, 09:16 PM   #16
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I would be interested in them however I am not working still.

I have been building my own for quite some time, only I just haven't made any larger ones yet.
Right now I am concentrating on perfecting my desktop model and then I will be applying all of what I have learned into some that will fit the stack.

jer
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Old 24th November 2012, 09:30 PM   #17
djn is online now djn  United States
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COOL!!! I have been going back and forth about these ESL panels. I know I can build the power supplies no problem, but my new room is small and the panels are large....and, I just finished my horns in May and just got a pair of Lambda woofers to replace the JBLs I have now.

I would like to hear your desktop ESLs sometime.
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Old 24th November 2012, 09:45 PM   #18
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I had though you had all ready got those running.

After I finish my desktop model I will focusing on a medium sized application just to suit the needs of situations like yours.

I am thinking of two sizes in the 2 foot and 4 foot tall range and my bigger ones will be 6' to 8' tall.

They will be of a hybrid design so that the won't have to be so wide.
I am also starting to play with electrically segmenting them as this will help to widen their horizontal dispersion.
From what I have read this works very well as the wider the panel gets the more directional they become.

Here is a picture of my latest mini panel.
It is 12 inches tall and 5 inches wide.
All that is needed is to mount the diaphragm and get the resistors needed for the segmentation.
I will be having a First test of this one some time this week.

jer
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Old 24th November 2012, 10:34 PM   #19
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If you are talking about the horns, yes, they've been up and down again. I made legs for them and they are out at the copper coater for copper platting. Those panels look very nice. The only experience I have with ESLs are my buddies top of the line SoundLabs. I don't have that kind of money.
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Old 24th November 2012, 11:12 PM   #20
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Quote:
If the Group delay gets to high it can give the low end a muddy or slow as some put it kind of sound.
I don't know exactly how low is good.
better than 800/f in milliseconds is what one wants, but hardly gets :-)

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