JBL 2245 Ideal enclosure

[Niklas Nord]

I have been reading the enclosure guide for
the JBL 2245.

Does everyne follow this guide? It doesent
seem to go as low as i want it to go.

What is the ideal design if i want it to be down
to 14 - 16hz

maybe lower the FS of the driver in some way?

CORNER placemement

[4313B]

You aren't taking into account natural room EQ. Read about it on the Internet. Buy some books. Know the room you're building your system for.

The 2245H doesn't respond real well to corner placement. Use single 2242H's instead if you're planning on doing that. Try sealed first and then ported and see which yields the prefered response.

How do you know it doesn't go as low as you want? You have some previous experience with it?

Perhaps you need to look at running the 2245H in a B6 alignment. Put it in 8.0 to 10.0 cubic feet, tuned to 20 Hz and then apply a 20 Hz auxilary filter with Q of 2.

[John]

Hi Giskard Is that what JBL did with the B460 Sub and BX63A crossover???

[4313B]

No, the B460 is a B5 alignment with an auxilary filter at 26 Hz with a Q of 2.

[jblwolf]

I found this in a old ATTEAN catalog if this helps-WOLF

[Niklas Nord]

Now i have two 2245 baskets !!

yiiippiiiieieii

[Niklas Nord]

And there may be 2 more 2245..

[Ralf]

Originally posted by Niklas Nord
And there may be 2 more 2245..

Where you get FOUR 2245H? In Germany there is no way to get it. :-(

[Niklas Nord]

'

Whell you can use 2240 and e-155 baskets as well
then recone

[Ralf]

Originally posted by Niklas Nord
'

Whell you can use 2240 and e-155 baskets as well
then recone

Yea! That`s the way :-)

[Niklas Nord]

oh yes

There are always several ways you know

[Niklas Nord]

I learned by Giskard, the jedi knight master of JBL reinforcement

[JBL 4645]

I learned by Giskard, the jedi knight master of JBL reinforcement

Well JBL is also…Jedi Blaster Lightsabers.

Today I found some Informations about enclosures with 2245H. These are from JBL`s "Field Service Manual" from 198x. I got it from a local JBL-Dealer. Next time I will get it to scan it completely...

I'm surprised. That`s nearly the same result as I have calculated here:

Vented Box for 18"

Hey I like the idea of that tried drainage piping with bends and extended tubing attached to the my diy JBL 4645 a few years back. I wasn't sure if it worked because I didn't have decent way of seeing the frequency response on a recorded graph.

Any idea on the diameter of the tube I see 22" but what is the port diameter?

I have a few 18" sub bass systems - mostly in 10cf boxes.

Are you building the 14hz subs for your dog freinds?

I always thought the human ear can only hear frequences down to about 25hz. In addition, the music content in CDs and cinema DVDs doesn;t go below this anyway; right?

Well cats are limited to 40Hz to 90 KHz

[A Vanderkruk]

Sorry for late post to this thread , I didn't want to make one more 10cuft box. I thought of trying the 2245 in a horn again, this time rear loaded,I read on other threads that it was probably not a good choice to use the 2245 because of excursion limits. I went ahead anyway as i had these beauty's sitting in boxes since a fresh recone. Horn I made is for theater use first I thought it was going to be a sub,as my last front loaded corner horn was usable only up to 90hz, this thing is very different, it has a range 20hz to 1200hz so it make a two way system possible,easy even! I am in first testing stages, so far it seems very good, 100db of 20hz at 2.8volts RMS ,I don't know how that would compare to a 10cuft commended enclosure? Anyway i'm loving this thing the jBL is wonderful and i don't see any excursion problems at all, The drivers i bought were torn at the voice coils when I got them so my guess is they saw combat some where in the past. now they have the good life again.
pictures how do i post them

[Lee in Montreal]

Interesting

Do you have any diagram showing what's inside the horn? What brand of recone is that? How does it sound?