I'm in the process of building a system Tri-Amped system based around the 2235h. Also using 2 - 2425h and a 1 - 2405h per channel. Trying to replicate (in looks) a JBL Synthesis S9900 of sorts... The 2425's are a 1" throat whereas the S9900 uses a 2" throat. So they look the same but the face is different... LOL
I'm tuning the box to 35hz; 4" diameter vent, 3" long; 5cf cabinet. Can someone please check my figures on this setup? Or I am alternatively considering a sealed cabinet, with a 18" sub and making it a Quad-Amped system. Space and money are no concern. Kinda leaning toward the sealed cabinet, because the 2235 will need to be crossed over to the 2425's at about 900-1k hz.
I didn't mean to hijack your post RamJBL but perhaps this gives you some ideas on how to use your drivers.
I'm tuning the box to 35hz; 4" diameter vent, 3" long; 5cf cabinet. Can someone please check my figures on this setup? Or I am alternatively considering a sealed cabinet, with a 18" sub and making it a Quad-Amped system. Space and money are no concern. Kinda leaning toward the sealed cabinet, because the 2235 will need to be crossed over to the 2425's at about 900-1k hz.
I didn't mean to hijack your post RamJBL but perhaps this gives you some ideas on how to use your drivers.
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Tune them lower to say 30Hz or so. In 5 cubic ft if you look at the displacement numbers you can run them to full power all the way to the box tuning frequency. If you are going to go sealed look at a 12" 2206 instead. More power handling will do better up higher. I don't use my 2235's above 300hz.
Rob
Rob
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Tune them lower to say 30Hz or so. In 5 cubic ft if you look at the displacement numbers you can run them to full power all the way to the box tuning frequency. If you are going to go sealed look at a 12" 2206 instead. More power handling will do better up higher. I don't use my 2235's above 300hz.
Rob
Thanks Rob! I was really wrestling with this and honestly trying to make the 2235 do too much. Your post helped me recognize that, prompting me to investigate the 2206. I took a quick look on eBay and just bought 2 very nice units for
$350 + shipping from a seller with over 800 feedback (100%).
For a 3way using JBL 2235H and 2206H you can research the SEOS12 and SEOS15 waveguide for 90x40 polar response tweeter, and also research the 18Sound XR1064 for 60x40 polar response tweeter.
The design goal is to:
1) study the polar response of the 2206H from 800Hz to 1600Hz.
2) listen to the 2206H up to 1100Hz, and then up to 1600Hz to determine highest desirable Xover frequency
3) Graph your room with a few speaker placement options usng 90H vs 60H degree horizontal polar pattern horns.
4) Select a horn that has a physical time alignment depth that matches the 2206H. i.e. shallow horns that physically time align with 2206 simplifies Xover.
4b) there are different slope M - T xovers that offer modest time delay with modest SPL bumps.
JBL 2235H using T/S parameters in #4
YELLOW 4 cuft tuned to 34Hz ~0.7 Qts
GREEN 5 cuft tuned to 32Hz
BLUE 6cuft tuned to 30Hz
JBL 2206H in 1 cuft sealed box has -3db at 99Hz
HORN OPTIONS: 90H x 40V and 60H x 40V are most common.
Look for polar response measurements for JBL 2206H to determine at what frequency it produces a 90 degree polar pattern, and at what frequency it produces a 60 degree polar pattern.
Look at low cost plastic SEOS12 or SEOS15 wave guide. 90 x 40 polar response with 1" compression driver covering 1100Hz - 1200Hz up to 20Khz.
Look at 18 Sound XR1064 60x40 constant directivity horn with a 1" compression driver covering from 1500Hz - 1600Hz up to 20Hz.
The design goal is to:
1) study the polar response of the 2206H from 800Hz to 1600Hz.
2) listen to the 2206H up to 1100Hz, and then up to 1600Hz to determine highest desirable Xover frequency
3) Graph your room with a few speaker placement options usng 90H vs 60H degree horizontal polar pattern horns.
4) Select a horn that has a physical time alignment depth that matches the 2206H. i.e. shallow horns that physically time align with 2206 simplifies Xover.
4b) there are different slope M - T xovers that offer modest time delay with modest SPL bumps.
JBL 2235H using T/S parameters in #4
YELLOW 4 cuft tuned to 34Hz ~0.7 Qts
GREEN 5 cuft tuned to 32Hz
BLUE 6cuft tuned to 30Hz
JBL 2206H in 1 cuft sealed box has -3db at 99Hz
HORN OPTIONS: 90H x 40V and 60H x 40V are most common.
Look for polar response measurements for JBL 2206H to determine at what frequency it produces a 90 degree polar pattern, and at what frequency it produces a 60 degree polar pattern.
Look at low cost plastic SEOS12 or SEOS15 wave guide. 90 x 40 polar response with 1" compression driver covering 1100Hz - 1200Hz up to 20Khz.
Look at 18 Sound XR1064 60x40 constant directivity horn with a 1" compression driver covering from 1500Hz - 1600Hz up to 20Hz.
Attachments
EXAMPLE Google search measurements for JBL 2206H.
Polar pattern example shows 98 degree polar response at 1280Hz.
Could help you decide on tweeter options worth further exploration.
Your speakers could measure differently. A sweep plot of the speaker impedance vs. freq is the easiest first test, and useful to compare speaker A vs. B matching.
Polar pattern example shows 98 degree polar response at 1280Hz.
Could help you decide on tweeter options worth further exploration.
Your speakers could measure differently. A sweep plot of the speaker impedance vs. freq is the easiest first test, and useful to compare speaker A vs. B matching.
Attachments
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