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Rogers LSB1 Subwoofer Mated To JR-149 Monitors

J

jcwhite57

New Member
I own a pair of Rogers JR-149 loudspeakers. Recently I purchased a Rogers LSB1 subwoofer with the hopes I could mate it with the JR-149s. The problem is the LSB1 was designed specifically for the LS3/5A loudspeaker. I think what Rogers was attempting to do with the LSB1 was to match the sensitivity and eliminate the LS3/5A LF bump. I believe the LF bump is what makes the LS3/5A incompatible with typical subwoofers. Also the LS3/5A sensitivity is 82.5 dB while the JR-149 is 90 dB. What I'm attempting to do is modify the LSB1 crossover so it is better suited for the JR-149. The reason for my post is to share this information and hopefully get some feedback from more knowledgeable and talented people on how to better mate the two speakers. I'm attaching the circuit diagrams for the LSB1 original and modified crossover.

Note: I intend to label the LSB1 as being modified and will leave the wiring diagrams and removed components inside the enclosure for future reference.
 

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I had hoped for a few comments.

If anyone is interested:
I am very pleased with the results of the LSB1 mod. The speakers match in both tonal quality and balance and are very pleasing to listen to for extended periods.
 
Last edited:
jcwhite57 said:
I had hoped for a few comments. If anyone is interested,

I am very pleased with the results of the LSB1 mod. The speakers match in both tonal quality and balance and are very pleasing to listen to for extended periods.
Click to expand...

That ought be a nice system. I've never heard that exact set up, but I have heard LS3/5As with the AB1s and with Rogers LS35bs. Good luck and enjoy the system.
 
I looked up the LS35b since I had never heard of it before. Very large sealed enclosure and not nearly as elegant cosmetically as the AB1. Seems counterproductive to attempt to mate a subwoofer to the LS3/5a anyway as it was never intended to have one. The JR149 however was designed to mate with a subwoofer.
 
I would be interested to know dimensions of this speaker and the components values of the crossover and any photos.
 
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