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dougie.com
07-18-2003, 01:15 PM
Hello All,
I've been looking at building a 4560 bass bin and noticed that JBL has several versions : 4560, 4560A, 4560BKA.
They have low freq. responses of 45 to 60Hz with the same driver.
There does not seem to be any major differences in the boxes and I was wondering if anyone had any ideas about this.

Oh, I'm looking for enough information to build a 4550.
Plans, line dwawings, or measurements would be appreciated.

Thanks, Doug

Alex Lancaster
07-20-2003, 12:42 PM
4550's: Have You tried all of Lansing Heritage or JBL pro Vintage?

4560īs, the A suggest a minor change, BK is utility black; They are great (and bulky) for PA and Sound Reinforcement, but do not have much deep bass, even with a 2205H; for HiFi use monitors or make Your own.

Alex.

mikebake
07-21-2003, 09:32 PM
Alex is right, good boxes but bulky, and the horn loading starts dropping off below 180hz, so even though they designed it to function as a reflex box down low, its efficiency as a BR isn't as high, so while it IS producing bass down there, it ain't at the level of the midbass. It should be considered a midbass unit, really, although it is still a good unit overall. I use them for both minor PA use and a fair amount of hifi listening. You can supplement them with a sub and get good performance. These boxes do good things, they really do. They are proof that the enclosure is a HUGE factor.
My latest project I'm assembling is using the mid/high horn combo from the CS3115 (8 inch cone mid on horn, 1 inch comp. driver high), the 4560BKA for midbass, and a JBL 5644 quad 15 inch bass cabinet for the bass.
I have two 2245's that Giskard tuned in cabs for me; superior bass, but the 5644 is 103 db efficient, versus the published 95 db for the 2245's, so I am looking at seeing how they work out, just for fun. I have had these 5644's for, what, two years now, and have scarcely played a note through them. Perhaps a bit of EQ on the bass, if needed, and I'll have 103 db bass, 103db midbass, 105 db mid, and 111 db highs!! We'll see...!!!!!!

Don McRitchie
07-21-2003, 09:55 PM
The 4560 is definitely a midbass unit. I originally thought that it was developed as JBL's answer to the Altec A7 as a theatre speaker. However, Mark Gander told me that the box was designed by a tour sound contractor that later came to work for JBL. It was designed as a PA box from the start and was meant to be supplemented with bass bins.

dougie.com
07-21-2003, 10:17 PM
Thanks for all the info.
I have some D-130's and 2215's that I want to put into cabinets for a home sound system.
Does anyone have some suggestions for boxes for these?
I'm looking for boxes that best suit them.

Regards, Dougie

Mr. Widget
07-22-2003, 01:35 AM
Take a look at this

http://www.jblpro.com/pub/manuals/enclgde.pdf