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

[Ralf]

Originally posted by Niklas Nord
I learned by Giskard, the jedi knight master of JBL reinforcement

That`s realy right.

Hey Niklas, I have seen 3 2245 and one 2240 on ebay. What is a good price for a recone needed 2245/2240 in EUR?

[Niklas Nord]

Well, here in sweden they cost cirka 280 euro for a recone
to 2245 ...

EXPENSIVE WARNING

[Ralf]

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" (http://audioheritage.csdco.com/vbulletin/showthread.php?s=&threadid=1126&perpage=15&pagenumber=2)

[Ralf]

and something interesting if you want to have a special frequence...(also 2245)