Jaycar JV60 crossover upgrade - diyAudio
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Old 14th September 2009, 12:39 PM   #1
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Default Jaycar JV60 crossover upgrade

Hi,

I'm new to this forum and would like some advice. Back in '99 I built a set of Jaycar JV60 speakers (made my own enclosures) using the Jaycar kit (Vifa drivers). They sat in storage in Australia for 8 years before I shipped them over here to Scotland. I've been using them for over a year and am wondering if I could improve the sound (They do sound pretty good generally to my ears). Should I upgrade the components in the crossovers with better versions or should I try and replace the crossovers with something more modern/better quality?

If the latter can anybody give me advice on what a good crossover would be to build/use?

Does anybody have circuit drawings for these crossovers?

Finally, I don't have any electronics theory experience but I did build a subwoofer amp kit at the same time as I built the speakers. It worked fine so I'm OK with constructing something if I have decent instructions.

Any help would be greatly appreciated.
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Old 14th September 2009, 11:03 PM   #2
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I don't know how good these kits were, but probably could be improved, at minimum by upgrading any electrolyic caps. At least you'd have to tell us the model numbers of the drivers, the volume of the cabinets & port dimensions, and if possible draw us a wiring diagram of the existing crossovers.

Edit: Paul, post 11 this thread may be able to help:
Main Speaker Kits (Which Ones?)
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Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency

Last edited by PeteMcK; 14th September 2009 at 11:25 PM.
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Old 14th September 2009, 11:31 PM   #3
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found a version of the crossover:
http://redspade-audio.blogspot.com/2...-speakers.html

Edit: ah ha, it's Paul's !!!
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Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency

Last edited by PeteMcK; 14th September 2009 at 11:35 PM.
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Old 15th September 2009, 06:37 AM   #4
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Yes, they are the drivers in my speakers.

Thanks for the link. It's a good starting point. Any suggestions on particular components to use in the crossovers for best quality?
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Old 15th September 2009, 01:58 PM   #5
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I would leave out the bypass capacitors(.1uf) and replace C1 and C2 with Dayton film caps and C3 with something of similar or better quality.
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Old 17th September 2009, 03:02 AM   #6
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Hi Canetoad,

I designed these for Jaycar back in '95. My suggestion is to change all Caps to eliminate the Electros and if you want to go all the way, get some decent inductors as well. Funny how the designed boards came from china with micro components.

Others also replaced the tweeters with Morel MDT30 or 32. That requires C3 to have a value of (from memory) 5.6uF. This mod was used by a lot of members of the W. A. Audiophile Soc. They were quite impressed.

Personnaly I dislike metal tweeters. Give me silk any time.

Terry
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Old 18th September 2009, 06:05 AM   #7
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I should be abale to get a set of MTD32s tweeters. Will these be OK? Will the capacitance value change from 5.6uF for these?
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Old 19th September 2009, 01:14 AM   #8
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Quote:
Originally Posted by canetoad View Post
I should be abale to get a set of MTD32s tweeters. Will these be OK? Will the capacitance value change from 5.6uF for these?
Hi again, they will be fine! Your much less likely to blow these and power handling will be much greater. You will run out of excursion on the woofer before the tweeter can be damaged. Enjoy.

Terry
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Old 19th September 2009, 11:04 AM   #9
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Thanks Phoenix,

Being an absolute novice, can you tell me what caps to use that aren't electrolitic? Also, what do I look for in an inductor for quality. Will it's spec sheet give that information?

Any advice would be greatly appreciated.
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Old 20th September 2009, 02:45 AM   #10
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Quote:
Originally Posted by canetoad View Post
Thanks Phoenix,

Being an absolute novice, can you tell me what caps to use that aren't electrolitic? Also, what do I look for in an inductor for quality. Will it's spec sheet give that information?

Any advice would be greatly appreciated.
for caps, polyprop or similar, 250Volt is my preference.
For Inductors, just look for good wire sizes, 1.2mm to 1.6 would suit your build.

Terry
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