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How much does a Zobel network and its components affect the sound of speakers?

Regardless of amplification, my Merlin Audio MMI monitors have always sounded bettter using the Merlin RC Master (Zobel) Networks consisting of a Dueland capacitor and a Caddock resistor in series bringing the tweeter terminals. I've heard that some have replaced the networks using Jupiter capacitors and Vishay resistors and different wires and spades. My question is, How much do the networks and their components and associated values affect the sound? At times my speakers, while having superb resolving ability, can occasionally sound edgy, particularly noticable with voices at higher volumes.
pmboyd

Showing 3 responses by avanti1960

avanti1960
1,551 posts
 
A zoebel circuit is used to flatten the impedance of a driver and is not a crossover per se or doing any filtering. they are typically wired in parallel (you say in series "bringing" the tweeter terminals, which is likely in parallel) and as long as the parts are of good quality and their electrical values are within specification it is unlikely that higher quality parts will have a big impact on the sound quality- such that premium crossovers can do.  
avanti1960
1,551 posts
 
as "AK" mentioned sounding edgy at higher volume could mean a high amount of off axis output but there are many other potential causes.
I review of your speakers mentions the need for precise room positioning and toe-in.  This also implies that the listening position needs to be somewhat nearfield and also dedicated as lots of true monitor speakers require.  
Does it sound edgy while walking about or in different listening positions other than dead center?  They are designed to sound best listening dead center with considerable distance (4 feet or so) from side walls and optimized toe in.  
Getting the speaker and listening positions at their best is important for these speakers.  
avanti1960
1,551 posts
 
You definitely need the zoebel and might see an improvement in sound with new parts if the current cap and resistor are out of spec or defective.  
the zoebel is not a critical part of the crossover network that would lend itself to sound quality upgrades with improved quality parts.  
If you have DIY capabilities those parts should be inexpensive all things considered if you are determined to give it a try.  

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