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JBL HDI-3600 Crossover Upgrade: Mundorf

Hi guys, I have a new-to-me pair of HDI-3600 and would like to turn a great pair of speakers into a super pair of speakers. Having a look at the stock crossovers, lots of room for improvement, I think JBL could have done a better job frankly given the cost of these - no-name electrolytics (par for the course) and no-name film which appear entry level in the HF.

Question is, moving these caps and resisors to Mundorf options leave me with small variances in values. I am not thinking these variances would make any significant difference, but interested in folks’ opinions.

Here is what I am looking at - replacement value + originating value for both caps and resistors:

Product+value Original Value Application

MCap Supreme
1.8uF(600V) 1.8 HF

MCap Supreme
3.9uF(600V) 4 HF

MCap EVO
22.0uF(450V) 24 HF

MCap MKP (250V)
15.0uF(250V) 15 LF

MCap MKP (250V)
22.0uF(250V) 23 LF

MCap EVO
6.8uF(450V) 6.2 & 6.8 HF & LF

MCap EVO
15.0uF(450V) 14 HF

MR10 Metal-Oxide Film Resistor
2.2Ohm 10W2R4J HF

MR10 Metal-Oxide Film Resistor
3.9 10W4R3J HF

MRES20 MResist Supreme Resistor
10Ohm 25W10RJ HF

 

Any thoughts or wisdom from experience? Notice I am considering vanilla MKP on LF and Supreme/EVOs on HF..

 

Thanks!

rickysnit
Post removed 
rickysnit OP
79 posts
 

Original crossovers:

https://ibb.co/W5YQQH5
https://ibb.co/LR0wy6N

erik_squires
17,560 posts
 

Be careful replacing electrolytics. They tend to be in the bass section and changes in the ESR can unduly affect the entire impedance curve negatively. If you replace a high ESR cap with low, you must compensate with added R in series. Even small changes, on the order of 0.5 Ohms or less, can have big impacts in the overall impedance, especially caps that go to ground either in the odd numbered poles or as part of a Zobel.

High end Mundorf caps have a sound signature. You should experiment to see if it’s the way you want to go. I find them splashy and overly zingy. Excess air and color.

Listen to Magico and B&W’s top end stuff for an idea.

rickysnit OP
79 posts
 

changes in the ESR can unduly affect the entire impedance curve negatively.

Thanks Erik, that’s the first I’ve ever heard of that. My thoughts were Elecs are mostly used in LF since SQ impact is lower using cheap in LF.

I’ve had some pretty good experiences with Mundorf on the ’zing’. I listen to a lot of jazz and enjoy the clarity on the percussion.

Any recommendations you might have and any thoughts on the variances in values?

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