I cannot seem to find the spec sheet for the 2432H compression driver. Does anyone know if it is "red => forward motion" or "black => forward motion"?
Another question... I have just received the 5641 enclosure (the 2226H driver in a 4507A enclosure), and can see by the spec sheet of the 2226h that black => forward.. Will this mean that JBL has wired the 2226h this way in the 5641 enclosure or have they switched polarity to follow the "standard"?
Club double 16"
"Laissez les Bons Temps Rouler"
Hi
It is not correct to measure from the listening position, if you ask me.
What did you set the delay time 50sec or 50msec or 2 hours?
What processor do you have?
Thanks
http://www.jblproservice.com/pdf/The...es/4722-HF.pdfOriginally Posted by Jonas_h
I guess it's a positive transducer, if I interpret this specsheet correctly
Thakns for the answers. On the 4722-HF terminals, it says "EIA", so I guess this verifies that it is positive.
The 2226H is negative, but I dont how it is wired in the 5641 enclosure. In Stephanes document, the 5671, which uses the 5641 LF enclosure, is listed as negative, so I guess the 5641 is negative as well.
Do you know how to actually measure and verify this?
Can you find the spec sheet for this model?
Anyways, with a small battery at the cabinet terminals, you can check the polarity. Then you must assume that JBL wired the rest of the components properly for the system to work correctly.
This you can confirm with the service spec sheet.
This also could be useful: http://www.jblpro.com/catalog/suppor...=478&doctype=3
Ok that is weird.. In Stephane's document, the 5671 is described as "negative" but in the document above it says positive? Am I reading it wrong?
Well, what it says is that there's no reverse connection on any component.
In some settings, it call for reversal of the mid driver for example, in order to restore phase. In this particular setup, all cabinets should be connected + on red.
Now maybe INSIDE the woofer box, the 2226 could be reversed.
Don't confuse driver wiring and cabinet wiring.
Hi
According to Rane witch I belive is true and it is the same for the dbx setting for the delay time between the drivers.
Read this manual
http://www.rane.com/pdf/old/ac24man.pdf
Between my LF to the MF is 14cm and then I divide this number with 34,5 cm it will get 0,406ms and this number corresponds to the settings in dbx for my speakers.
according to this formula
331,4+0,6Tc
Tc= temp in degress Celsius
m= meter
s= seconds
if I calculate your 60ms I will get,
34,5cm x 60ms = 2070cm, this can't be correct. If you now have it 2 meters apart between LF and HF then it is correct.
About measureing in room how do you know if it is not a suckout in your listening position, when you have the polarity in phase. When you have the HF in reverse you get a straight line.
Now, what is correct here?
Thanks
Sorry for the late reply. I didn't get any notification e-mails.
In regards to the out of phase issue when I revert the polarity, then I just followed recommendations from the store I bought the speakers at and guides around the internet.
When I set the delay, I do not measure the distance between the LF/HF.. I do a measurement with software of both drivers individually and measure them impulse response.. I can then compare the response ofthe LF and HF and compute the difference in time (i.e. when the signal arrives at the microphone). This must be the correct delay to put in. I think the delay is around 60msec. The HF is tilted a bit.
Why would you not measure in the listening position? The important thing is to have the LF and HF sound arrive at the same time for the listener - not at a microphone right in front of the speakers. (Thats my theory)
Hi
Could you show a picture how you have aligned the LF with HF. You can measure the distance between LF to HF physically and then calculate the delay time. For ex. I have between LF to MF/HF 14cm and it is 0,40ms adjusted in the LF.
Thanks
Hi
Another question, don't you get out of phase in this setup, meaning that the HF is reversed and the LF is normal.
Thanks
That's correct. Just connect it as labeled on the cabinet and you are fine. Have excactly the same cabinet. + to + and - to -.
Thanks
Hi
Aha, now it is better.
According to dbx260 setting for 4622 bi-amp(same as 4722) it say's 0,75ms in the LF section and they have not reversed the polarity.
The crossover settings in dbx260 is, and I asume, is done in anechioc conditions.
That goes for the PEQ as well.
What DSP do you have? If you don't have the dbx260 it may give you totally differen't results.
Have you read the link?
Thanks
I have hooked my system up as described on the cabinets (+ to + and - to - on LF/HF). When optimizing the x-over and having the delays set, measurements showed that the best results was achieved when the polarity on the HF was reversed. After speaking to JBL, they mentioned that this is very common and is done in passive networks often too.
The system sounds great and I've achieved my goals.
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