Can a JBL 2225h really become a 100% 2235h? - Page 2 - diyAudio
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Old 17th September 2010, 11:10 PM   #11
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I answered you over on Lansing Heritage

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Old 18th September 2010, 05:21 AM   #12
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Sorry, I coudn't find Rob's comment.

My 2235h are in enclosures of about the same volume and IIRC I tuned them above fs - ~25Hz? The legacy JBL info suggested 30Hz IIRC. I have no problem with the rare program material below that - at least in home use. Suggestion: cut the baffle ports carefully so that you can press fit and test different lengths of port tubing. I'm using 2 3" PVC tubes. FWIW, I cross mine over with 4th order Butterworth filters at 165Hz using Thuneau frequency allocator lite. Compared to freeware IIR XO's, the Thuneau filters offer more punch and a bit more 'smoothness'. Since I got that software I have only set things up by ear - I should record sine wave sweeps and see if there is room for improvement... Bottom line: Enjoy!!!
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Old 18th September 2010, 01:37 PM   #13
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Rob's reply.
2235h + bass reflex + 6.9 cubic feet. But...

JBL's engineers sure knew what thy were doing when they made the B380 subwoofer which used a 2235h in a 5cf enclosure, but they were not the only link in the project. Between the marketing guys (the enclosure should not take up too much volume in a small appartment or it won't sell) and the bean counters (please design the enclosure so that it fits one 4'x8' sheet of presswood or we may lose profitability), a great idea is often diluted. Therefore, why not make something different? 5 cubic foot 's resonance is 30Hz. 6.9 cubic foot's is lower, 25-26Hz. Going to a bigger enclosure will drop a bit on efficiency, but will slightly increase the very bottom end. Anyway, it is only a weekend experiment, and if I don't like it, I'll trash the cabinet. ;-)

As for the ports, I have two openings and I'll tune each one to a different frequency. 20 and 26Hz. Then I will have the choice between one and the other, and will test what works best.
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Old 20th September 2010, 03:35 AM   #14
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1983 JBL SUBWOFFER DESIGN

I used the B380 with an 800W amplifier.

Make sure the amplifier has a peak limiter so it cannot clip. I was able to bottom out the driver with any sized amplifier when it clipped, even a 100W unit.
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Old 20th September 2010, 12:37 PM   #15
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I can run the sub thru an active crossover and digital eq. Both with limiters. BTW I have finished painting and clearing the beta-enclosure on Sunday afternoon. One port is tuned to 20Hz (driver resonance) and the other is tuned to 26Hz (enclosure resonance). BOth with a small 1/2" radius. I am ready to drop the 2235h on the front baffle, and only waiting from my supplier to get back to me about the mounting clamps.
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Old 20th September 2010, 11:05 PM   #16
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Quick partial update. I connected the 2235h to my active crossover feeding an ADCOM 5500, with cut-off at 70Hz. and I am in love. I switched bass reflex ports between 20Hz and 26Hz, and I think I prefer the 20Hz as the bass feels better, but it will take time before I can decide and there might also be some psycho-acoustical placebo syndrome too ;-). The single 2235h in a 6.9cf bin has more deep bass than a pair of 12 inchers in 3cf enclosures. The final design will be with 6.9cf enclosures, nothing smaller.

I found a local source with 90 (ninety) 2225h for sale and have asked to look for three units with bad suspension at rock bottom price so that I can recone them to 2235h. Dude also has 40 (fourty) 2405 for sale... Hmmm... All components come from Montreal's Jazz Festival equipment.
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Old 31st October 2010, 03:33 AM   #17
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I hope you guys don't mind my intrusion but I figured you are the ones to go to. I have a 2205 and a 2220 basket (alnico magnets) with 2225 recone kits. Does that make them a 2225, or what?

Gale
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Old 2nd November 2010, 08:58 PM   #18
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Another update. I now run a pair of 4530 bassbins with 2225h drivers on an ADCOM 5500 (overall an okay amp. Not more. Punchy around 40-50Hz but not much down 30Hz) AND the 2235h sub driven by a Yamaha P2200 (maybe the sweetest power amp I ever had).

The 4530s alone have great kick but no bottom. The 2235 sub has great bottom but no kick. Therefore they complement each other very nicely. Now looking for another P2200 to replace the Adcom. ;-)
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