First post.
I have a pair of JVC SP-95 speakers that came as a combo Kit for some unknown JVC equipment. Cheap speakers I know but there large 3 ways and ported with a 12 in. full range woofers & 1” tweeters, 3”mids. The tweeters & mids failed, they have been replaced with a Peerless tweeters 4 ohm & Goldwood mids 8 ohm. The woofers are 8 ohm also. I also re capped the crossovers with the same uf value caps that were originally on the crossover. The woofers & tweeters share a 1.5 uf cap & the mids use a 6.8 cap & both caps run through 2- 3.3 Ohm sandcast resistors. Pretty simple crossover. Problem is the tweeters are not bright enough & the mids are almost nonexistent, l can’t hear the mids. The woofers work great, lots of bass response. I made a mistake using 4 ohm tweeters, would they improve if I replaced them with 8 ohm tweeters? What kind of cap would bring the mids back to life, the 6.8 cap isn’t right for them. Some kind of ball park uf value for the mids would be great to know. Thanks for any info.
I have a pair of JVC SP-95 speakers that came as a combo Kit for some unknown JVC equipment. Cheap speakers I know but there large 3 ways and ported with a 12 in. full range woofers & 1” tweeters, 3”mids. The tweeters & mids failed, they have been replaced with a Peerless tweeters 4 ohm & Goldwood mids 8 ohm. The woofers are 8 ohm also. I also re capped the crossovers with the same uf value caps that were originally on the crossover. The woofers & tweeters share a 1.5 uf cap & the mids use a 6.8 cap & both caps run through 2- 3.3 Ohm sandcast resistors. Pretty simple crossover. Problem is the tweeters are not bright enough & the mids are almost nonexistent, l can’t hear the mids. The woofers work great, lots of bass response. I made a mistake using 4 ohm tweeters, would they improve if I replaced them with 8 ohm tweeters? What kind of cap would bring the mids back to life, the 6.8 cap isn’t right for them. Some kind of ball park uf value for the mids would be great to know. Thanks for any info.
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Can you draw an exact schematic of the filter? I am assuming your midrange driver is likely over high passed with a single 6.8 uF, I guess a larger cap would do better. Tweeters are choked with 1.5uF as well. A redesign is necessary. What models are those drivers?
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I did mistakenly say the woofers we’re sharing the 1.5 cap with the tweeters, there not, woofers only connected to the pos. & neg. speaker connectors. The 2 caps are non polarized. I used a couple of jumpers an connected a 3.3 cap to the 1.5 cap for the tweeters giving 4.8 uf to it, it did improve a little. I was reading that the typical uf value for a mid range is 40 uf ? I have a 6.8 cap on it now, I’m guessing that’s to small. As you can see I’m totally lost on crossovers & freq response.
Tweeters Peerless XT25TG30-04
Mids Goldwood GM-85/8
Woofers are JVC 12” full range, that’s all I know about them.
Mids Goldwood GM-85/8
Woofers are JVC 12” full range, that’s all I know about them.
I'll perform a simple simulation based on manufacturer datasheet and we'll see what options we have.
I can hear now that the capacitors I’ve been using are to small for both the tweeters & mids. I used some jumper wires to connect to the existing caps adding more uf value to them by using other caps I had laying around. The mid range speakers started to come alive. The tweeters improve some but not enough,there 4 ohm. Would 8 ohm tweeters respond better? I know this is the wrong way to do this & I’m trying to make silk from a pig’s ear but it’s about learning.
Tweeters are perfectly fine, midrange unit less so being sealed within basket, woofer is likely ok. Things get messy when filter is non-existent.