JL Audio CR-1 Crossover


So, I own 4 JL Audio F-113 subs. Each of these were bought used and all have been updated at JL Audio.

I have been very happy using them in my system. The main speakers are Focal Sopra 2’s. I am using a Iso-Max Jensen transformer(s) model #SP-2SX to connect the subs to my mains and it seems to work pretty well. BTW, the Iso Max unit(s) convert speaker level to balanced (similar to the Rel subs) using Speak-On fittings.

The JL Audio solution to the high/low band pass issue was their CR-1 Electronic crossover. I always wanted to try one of these but at $3000 list I didn’t think it could improve that much over my Iso Max unit(s).

However, I was able to find a used JL Audio CR-1 electronic crossover and I have just now connected it up.

The first thing I noticed was how much very low bass I was missing. Example: Linda Ronstadt “Blue Bayou” the bass now digs into the subterranean.

I guess I need to play with it a while. but I was wonderin’ if anyone else who owns or has owned this unit can share any set ups tips and general opinions of the unit.

ozzy

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I had the CR-1 and a couple JL e110 subs for quite a while 

(paired to my Thiel 2.6 speakers).

First of all JL Audio is a stellar company to deal with.

Really helpful customer service and fantastic products!

id first tried integrating the subs “REL style,” running the 

mains full range and adding the subs via the high level 

signal input.  They meshed surprisingly well in terms of audibility 

but not perfect.  I added the Dspeaker anti mode dsp just 

to the subs and it got a little smoother.  Though I kept noting 

an unwelcome change in timbre to my system - too dark

and lifeless.   Finally I added the CR-1 to cross the subs 

with the mains “proper style” and it was significantly better.

I managed to maintain much more of my systems regular 

tone while adding the subs.  The CR1 was a delight to use.

So easy and intuitive.  I loved being able to demo my system

with the subs crossed over or the speakers run full range 

at the push of a button.  That really allowed me to see what the

subs were adding.  Also the CR1 sounded completely transparent!

 

Ultimately I decided against the subwoofers.  I didn’t

find the low bass added much, I didn’t note any particular

clarity or lack of strain in the mids and up, and it still slightly

altered the tone from what I liked.   My speakers sounded to

me more finally real and alive and punchy without the subs.

So I sold it all with no regrets.

 

But I very highly recommend the CR1 for anyone wanting

to integrate subs in the analog domain. 

^^^ sorry for bad formatting.  Typed on new iPhone and for some reason that’s how it formatted 

Thanks prof,

I am really surprised at how transparent the CR-1 is. I guess the main speakers used and the crossover point chosen is the challenge to making it shine. The CR-1 allows easy movement of that point for a seamless transition.

ozzy

One thing that might be worth mentioning about the CR-1 are the ground lifting switches in the back.  Their position matters, especially when using RCA ICs.  Owner should definitely test if grounded or floating sounds best to them.

The ground switch is a good tip I overlooked. Thanks. 

I switched from master/slave mono to stereo. At that time I phase adjusted R and left channels to 80Hz with an SPL meter and also volume corrected the right channel at 80Hz. Phase was zero in mono mode and the xover was best at 12db.

Either way works the overall results were a compromise. The mono mode at 12db cover luckily reduced 115 and 170Hz peaks while producing a dip at 28Hz. Subjectively I prefer the mono mode, but neither is a slam dunk. 

The damping knobs have a broad reach. Broader bandwidth than I was exprecting and easily measured. At 80Hz, I created a "satellite" dip that went up to over 200Hz.