Need help designing JBL 4722 semi clone - AVS Forum
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post #1 of 14 Old 08-08-2012, 01:02 AM - Thread Starter
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I was intrigued by a few users her who have the JBL 4722s for their lcr setup to get some myself. However, I want to go the DIY route and need help deciding whether to go with a dual woofer low section. My HF section will be the 2431H comp. driver with the same horn as the 4722 (365359-001 I believe in JBL parts). The LF will use either one or two 2226 drivers in an active XO configuration. What are the advantages/disadvantages of going with two woofers instead of one? Going with one woofer I'd save $200 a speaker, making the total cost ~$500ea. Dual woofers is $700. Convince me I only need one so I can save some money!

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post #2 of 14 Old 08-08-2012, 03:00 AM
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Moar bass, son! tongue.gif

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post #3 of 14 Old 08-08-2012, 08:24 AM - Thread Starter
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Moar bass, son! tongue.gif

But why!? I already have two subs for the super low end.

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post #4 of 14 Old 08-08-2012, 09:02 AM
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But why!? I already have two subs for the super low end.
Good point, which raises the question of why use 2226 when 2206 will do?

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post #5 of 14 Old 08-08-2012, 09:24 AM
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But why!? I already have two subs for the super low end.

More bass. Your subwoofers will be busy producing subbass. wink.gif

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post #6 of 14 Old 08-08-2012, 11:49 AM - Thread Starter
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Originally Posted by Bill Fitzmaurice View Post

Good point, which raises the question of why use 2226 when 2206 will do?

According to JBL's price sheet, there's only an $8 difference. If the 2226's are that much better, I'd just assume spend the extra $8.

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More bass. Your subwoofers will be busy producing subbass. wink.gif

Gotcha. In another thread I read that using one 2226H with the 2431 CD at a higher XO point would be better than using the two 2226H's and the same CD at a lower XO point. Is the higher output of two 2226H woofers better for a normal sized home theater than the higher XO would be from using one woofer? I know you can't really put a dollar amount on performance, but this is where my head's at. I'd rather put that extra $200 a speaker into an amp or electronics if I don't really need two woofers.

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post #7 of 14 Old 08-08-2012, 11:55 AM
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Just ask yourself if an extra 6dB of bass across the board (within the bandwith of the 2226) is worth the extra money or change in crossover. Do you need a more compact speaker? Do you want lots of bass? It's pretty easy to weigh out from what you would want to have. The performance will be good either way. Single 2226 systems are common with the surge in popularity with the 4pi speaker and it is no slouch.

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post #8 of 14 Old 08-08-2012, 02:12 PM
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Originally Posted by Frosteh View Post

If the 2226's are that much better, I'd just assume spend the extra $8.
They are if you're running them below 60Hz. If not the 2206 has wider dispersion, and if you need two for sufficient output/sensitivity the box size will be far more friendly.

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post #9 of 14 Old 08-08-2012, 02:34 PM - Thread Starter
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They are if you're running them below 60Hz. If not the 2206 has wider dispersion, and if you need two for sufficient output/sensitivity the box size will be far more friendly.

I don't so I'll just go with the 2206's then. Given that I may use these occasionally for outdoor music, I guess I'll bite the bullet on a dual woofer setup.

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post #10 of 14 Old 08-08-2012, 07:18 PM
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How big is your room? I was running dual 4648's (two 2226 in each). It had silly output ability. I scaled it back to a single 2226 for each main in a smaller sealed box and they have more than enough output to cover 40-200hz.
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post #11 of 14 Old 08-08-2012, 07:35 PM
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How big is your room? I was running dual 4648's (two 2226 in each). It had silly output ability. I scaled it back to a single 2226 for each main in a smaller sealed box and they have more than enough output to cover 40-200hz.
My point exactly. If you're not running subs 2226s have their purpose; keep in mind that most commercial installations where they're used don't have separate subs, the 2226s are the subs. With subs 2206s deliver the goods in only a 2 cu ft cab.

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post #12 of 14 Old 08-09-2012, 02:26 PM - Thread Starter
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Quote:
Originally Posted by Bill Fitzmaurice View Post

My point exactly. If you're not running subs 2226s have their purpose; keep in mind that most commercial installations where they're used don't have separate subs, the 2226s are the subs. With subs 2206s deliver the goods in only a 2 cu ft cab.

Hmmm. In that case I'll keep my eyes out for some 2206's. Since I'm deviating from the initial plan so much, is there another tweeter/waveguide combo that is comparable to the 2342 CD/guide combo? I'm not interested in anything more expensive than this combo, which I can get the CD for $300 a pop and the guide for $100. I suppose I could just go with a 4pi setup but I don't know much about the B&C driver compared to the JBL. That would certainly be a more economical route with that B&C driver being half the price of the JBL. The waveguide is also much smaller, what is the result of this vs. the jbl massive waveguide?

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post #13 of 14 Old 08-09-2012, 05:27 PM
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Quote:
Originally Posted by Frosteh View Post

Hmmm. In that case I'll keep my eyes out for some 2206's. Since I'm deviating from the initial plan so much, is there another tweeter/waveguide combo that is comparable to the 2342 CD/guide combo? I'm not interested in anything more expensive than this combo, which I can get the CD for $300 a pop and the guide for $100. I suppose I could just go with a 4pi setup but I don't know much about the B&C driver compared to the JBL. That would certainly be a more economical route with that B&C driver being half the price of the JBL. The waveguide is also much smaller, what is the result of this vs. the jbl massive waveguide?

You can get the 2226's for 200 or less each on ebay, and the Denovo-360's CD's work in place of the DE-250 in the 4pi.
So definitely a lot of money saved going that route.
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post #14 of 14 Old 08-09-2012, 06:21 PM
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The waveguide is also much smaller, what is the result of this vs. the jbl massive waveguide?
Large horn mouths are usually employed to give the HF and LF sections similar dispersion at the crossover frequency. Since the 2206 has wider dispersion than the 2226 it can use a smaller mouth horn that will give the same result. There are many less expensive HF drivers equal or better to the JBL, as JBLs tend to be overly pricey, and a ceramic magnet driver will come in a lot cheaper than neo as well. It would be nice if JBL published a spec sheet for the 2431, but curiously it doesn't seem that they do. I'd look at B&C, Beyma and BMS.

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