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Multi-Way Conventional loudspeakers with crossovers

Help identifying a replacement driver for 4" bookshelf
Help identifying a replacement driver for 4" bookshelf
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Old 9th August 2015, 07:19 PM   #1
kcducttaper is offline kcducttaper  United States
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Default Help identifying a replacement driver for 5 1/4" bookshelf

Hello ladies and gents! I've had a pair of JVC sp-d2t's (2-way bookshelf) that I got for $5 at a garage sale about 10 years ago and were surprisingly good (with eq and a sub underneath of course), so I kept them. Last night, I took them to an outdoor social party and it seems I've finally overcooked one of them. It smelled fantastic and my amp kept going into protection mode. I've gone ahead and ordered a pair of Infinity Primus 6 1/2" to replace them, but I'm curious about reviving my JVC's on the cheap and perhaps dropping them in my theater setup.

Here is the specs that I know so far:
- total internal box size (not including port space) .265 cubic feet
- port is 1 3/8" ID by 4.5" long
- the crossover is a single 100v10uF capacitor....that's it. lol
- it's got a 4" driver with an enclosure opening of 4 3/4"
- The total speaker impedance is 6 ohms, yet the 4" drive also says 6 ohms. Not sure how that works with a tweeter yet to be accounted for.....?
- The driver says "VGS1201-013" 6 (ohm) 6G
- The tweeter is just a small 1 3/4" driver although I don't know its sensitivity or ohm rating.

I just found a pretty good sized daddy long legs in the enclosure just a few minutes ago. Apparently he liked those smooth vibrations and climbed right in the port!

I haven't been able to find anything terribly useful online about this speaker. I poked around PE for a 6 ohm 4" driver and they only had 2, so I didn't even get around to modeling them out. I figured I'd post on here to see if anyone might have some good ideas. I can provide pics if that helps. Thanks in advance!

Edit: The driver is actually a 5 1/4". I measured it wrong the first time.

Last edited by kcducttaper; 9th August 2015 at 10:46 PM.
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Old 9th August 2015, 08:05 PM   #2
sreten is offline sreten  United Kingdom
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Hi,

Bin them.
Look for another pair of cheap speakers.
It will be cheaper and less guesswork.

rgds, sreten.
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Old 9th August 2015, 08:52 PM   #3
planet10 is offline planet10  Canada
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Help identifying a replacement driver for 4" bookshelf
Quote:
Originally Posted by kcducttaper View Post
- it's got a 4" driver with an enclosure opening of 4 3/4"
An opening of 4 3/4" is more indicative of a 5 1/4" driver. When you say 4" driver are you just measuring the cone?

I don't do many multiways, and when i do they usually have a low XO so i don't know how its higher frequency performance, but the Silver Flute W14 should work fine in that volume (we use a pr in 10L XOed at about 350 Hz).

dave
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Old 9th August 2015, 09:31 PM   #4
sreten is offline sreten  United Kingdom
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https://www.madisoundspeakerstore.co...1/2-wool-cone/

Hi, Its clearly a driver you cannot use without a proper x/o, rgds, sreten.

Last edited by sreten; 9th August 2015 at 09:33 PM.
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Old 9th August 2015, 09:54 PM   #5
kcducttaper is offline kcducttaper  United States
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Where's the fun in just chucking them?

When I measure from the edge of the surround to the edge of the surround, it's 4" pretty much on the dot. It's 5 1/4" from mounting hole to mounting hole.
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Old 9th August 2015, 10:04 PM   #6
planet10 is offline planet10  Canada
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Help identifying a replacement driver for 4" bookshelf
So it is a 5 1/4". The Silver Flute fits and will work in that volume, it is cheap, you'll have fun working on making the XO better. Good learning experience. You'll alsoneed to workout appropriate reflex tuning.

dave
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Old 9th August 2015, 10:05 PM   #7
planet10 is offline planet10  Canada
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Help identifying a replacement driver for 4" bookshelf
Always the pessimist?

dave
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Old 9th August 2015, 10:45 PM   #8
kcducttaper is offline kcducttaper  United States
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Quote:
Originally Posted by planet10 View Post
So it is a 5 1/4". The Silver Flute fits and will work in that volume, it is cheap, you'll have fun working on making the XO better. Good learning experience. You'll alsoneed to workout appropriate reflex tuning.

dave
Ha. Yeah, you're right. Fixed it.

I had also thought to take another 5 1/4" driver that works well in a sealed box, and chop off the port (and seal it up of course). Honestly, I think I have to figure out more about my tweeter before I can make a solid decision on a driver though.

Update just since I wrote that last paragraph:
The tweeter is a 4 ohm and now has a hole in it strangely shaped the exact size of my screwdriver.

Looks like I may be in the business of rewiring the whole thing now, which almost makes it easier, but if the price tag starts to run up too much, I may end up chucking them after all. From what I gather, a sealed box will give you a bit better clarity and definition in the mid range than a ported box. Is this correct, or not so much? I'll be running a sub underneath with an adjustable active XO, so I'm not worried about lacking lows so much.
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Old 9th August 2015, 11:01 PM   #9
planet10 is offline planet10  Canada
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Help identifying a replacement driver for 4" bookshelf
Quote:
Originally Posted by kcducttaper View Post
From what I gather, a sealed box will give you a bit better clarity and definition in the mid range than a ported box. Is this correct, or not so much?
It is a generalization that borders on myth. Execution is important, so the details matter.

dave
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Old 9th August 2015, 11:12 PM   #10
system7 is online now system7  United Kingdom
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This is entertaining.

planet10 is like myself being in the "Have a Bash" brigade! How hard can it be?

This https://www.madisoundspeakerstore.co...1/2-wool-cone/ looks like it works almost exactly the same except for the bump at 8kHz. Isn't ODougbo the silver flute expert on crossovers?

I've put a screwdriver through a tweeter cone often enough. You need to measure the tweeter cutout hole here, and I'm sure there is something that will fit! And there are some really cheap ones.
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