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XLS1500


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#1 Big G

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Posted 05 July 2011 - 01:27 PM

I have a Crown XLS1500 and a pair of JBL Cabaret Series 4691"s. I just purchased a pair of JBL JRX118S passive !8" subwoofers. The 4691's have a low impedance 1'4" jack on the back of the cabinet. I was wondering if I can run the 118"s from the 4691's in stereo mode, or do I need to bi-amp with another 1500 and a crossover, and if so, what do I need to set the crossover to? Thanks!
P.S. I'm a newbie dumba**, so any help would be greatly appreciated!!!

#2 Mctwins

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Posted 06 July 2011 - 12:13 PM

Hi

I don't think you can connect it like you describe. I think this low impedance connection is for adding another same speaker and get 4 ohms of total impedance but it requires more power from the amp.

If it was me, I would go with a another amp and choose the XLS2000 for the subs and run bi-amp.

At JBL pro site it says "30 Hz HPF, 24 dB / octave; 80 - 100 Hz LPF, 24 dB / octave" for that sub.


Thanks



#3 Mctwins

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Posted 07 July 2011 - 08:39 AM

Hi

But it says in spec for xls amps that the lowest freq setting is just 50 Hz.
Is this is correct then one can't HPF it at 30 Hz.

You can also run an additional xls1500 per side but one don't get a HPF for the subs. I think one needs this to protect the subs at the lowest cutoff freq.

But you can always use a dbx PA+.

Thanks

#4 Big G

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Posted 07 July 2011 - 09:01 PM

QUOTE(Mctwins @ Jul 7 2011, 09:39 AM) View Post
Hi

But it says in spec for xls amps that the lowest freq setting is just 50 Hz.
Is this is correct then one can't HPF it at 30 Hz.

You can also run an additional xls1500 per side but one don't get a HPF for the subs. I think one needs this to protect the subs at the lowest cutoff freq.

But you can always use a dbx PA+.

Thanks


I'm going to use 2 1500's and bi-amp, one for the 4691's and one for the JRX118's. Anymore setup tips?

#5 Big G

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Posted 13 July 2011 - 01:09 PM

QUOTE(Big G @ Jul 7 2011, 10:01 PM) View Post
QUOTE(Mctwins @ Jul 7 2011, 09:39 AM) View Post
Hi

But it says in spec for xls amps that the lowest freq setting is just 50 Hz.
Is this is correct then one can't HPF it at 30 Hz.

You can also run an additional xls1500 per side but one don't get a HPF for the subs. I think one needs this to protect the subs at the lowest cutoff freq.

But you can always use a dbx PA+.

Thanks


I'm going to use 2 1500's and bi-amp, one for the 4691's and one for the JRX118's. Anymore setup tips?

I have it bi-amped w/ 2 XLS 1500's, now.I should set the HPF to what freq., and the LPF to what freq.?

#6 Tom Lureman

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Posted 14 July 2011 - 08:06 AM

Are you talking about the 118S?  I would just set that as a LOWPASS with a cutoff point between 80-100Hz.

#7 Big G

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Posted 14 July 2011 - 02:46 PM

QUOTE(Tom Lureman @ Jul 14 2011, 09:06 AM) View Post
Are you talking about the 118S?  I would just set that as a LOWPASS with a cutoff point between 80-100Hz.


I have them in crossover mode ,set to 105Hz.

#8 Big G

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Posted 18 July 2011 - 08:10 PM

QUOTE(Tom Lureman @ Jul 14 2011, 09:06 AM) View Post
Are you talking about the 118S?  I would just set that as a LOWPASS with a cutoff point between 80-100Hz.


I need a step by step setup for these two bi-amped units and the exact settings,PLEASE. I am ignorant about these setups. I am looking for the BEST sound at about 100 db, with the stated cabinets. I am an ex drummer who knows nothing about this, just have a taste for loud, clear music!!!Thanks!

#9 Mctwins

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Posted 19 July 2011 - 02:31 AM

Hi
If you have JRX118S sub and according to this, they are mention about crossover settings,

Spec sheet

Do you understand how to set crossover points?

Thanks

#10 Big G

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Posted 19 July 2011 - 02:24 PM

QUOTE(Mctwins @ Jul 19 2011, 03:31 AM) View Post
Hi
I am little puzzeld, if you have JRX118S sub and according to this, they are mention about crossover network,

JBL SRX118S

if not, then you have to use a DSP to adjust your settings according to this

Spec sheet

but, I believe that you don't have any crossovers in those subs, but I'm not sure.

Do you understand how to set crossover points?

Thanks



I could use a little help in that department! Thanks!!!

#11 mixwiz

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Posted 18 August 2011 - 02:37 PM

Assuming you are running mono, best way would be to get a simple analogue 2 way cross over and another amp.  Set the amp to parallel.  Mixer to the crossover. High out put from the crossover to channel A of one of your amps (By setting the amp to parallel, the signal will get fed from channel a to cool.gif.  Low out from xover to sub amp (also set to parallel).  Connect speakers to amp outs.
For a starting poing, set the xover up at 100hz.  This will feed all content below 100hz to the subs and above to the tops.

Hope this makes sense.

#12 Mctwins

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Posted 19 August 2011 - 11:02 AM

Hi

According to the spec for JRX118S that I asume you have. That means that there is no crossover in those subs. This means you have to set the highpass at 30 Hz 24 dB slope and lowpass between 80-100 Hz 24 dB slope. It can be either Linkwitz or Butterworth This has to be tried out witch sounds best.

Do you run vertical or horisontal bi-amp?

Meaning one amp running to subs left/right and another amp running the tops left/right or
one amp channel 1 to subs and channel 2 for tops for the left side and same for the right side.

In both cases start with 80 Hz 24 dB butterworth on low pass and high pass. Test also anything between 80-100 with different crossover type, like Linkwitz and so on, but keep the 24 dB/octave.

But you will not have protection on the subs for the lower cut off freq at 30 Hz. Thats why I recommend active DSP like dbx PA+. My understanding is that the XLS lowest setting for high pass is 50 Hz.

FYI, I modified my link on my previous post.

Thanks