I want to build an enclosure for this sub Jbl GTO1014(Ik is cheap but is my first build). I would be using the yung SD300 sub plate amp no boost. I was working on WinISD to design it and I came up with 1.25cubic feet box tuned too 25hz. BUT is that 1.25cubic feet total or not including port and driver displacement? Also need help on making the L port. If anyone can tell me anything on how big to make the enclosure etc. I would appreciate the help. Btw sub is going to be used for hearing bass heavy music ,EDM.
1.25 cuft is a rather small cabinet for this driver, at this tuning frequency.
3 cuft ported to 25Hz will give a fairly flat response down low. If you want a really small box, you need a sealed box, EQ, and a lot of power. You'll lose raw SPL against the ported box, but at least you can keep the cabinet small.
Chris
3 cuft ported to 25Hz will give a fairly flat response down low. If you want a really small box, you need a sealed box, EQ, and a lot of power. You'll lose raw SPL against the ported box, but at least you can keep the cabinet small.
Chris
What about if I tune it higher? The specs from Jbl say 1.25ft is enough http://www.luxusni-elektronika.cz/products/getfile/a1f4d566977f576f44559e2d9b9fe274f633a095
Hi,
Nonsense. 1.25cuft is fine for a 1 cuft Vas driver.
3 cuft is nonsense and 1.5cuft is the maximum.
Sealed would be about 0.75cuft well stuffed.
Box volume is internal volume + driver volume+ port volume.
25Hz tuning is ambitious, 31Hz (low B) more practical.
For music a flared 2" minimum diameter port should work.
rgds, sreten.
Nonsense. 1.25cuft is fine for a 1 cuft Vas driver.
3 cuft is nonsense and 1.5cuft is the maximum.
Sealed would be about 0.75cuft well stuffed.
Box volume is internal volume + driver volume+ port volume.
25Hz tuning is ambitious, 31Hz (low B) more practical.
For music a flared 2" minimum diameter port should work.
rgds, sreten.
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Sreten, Qts comes in at just below 0.5, IIRC. The driver wants either a moderately sized sealed box or a large ported box to get a native ~flat response.
I would like a small box not a huge 3cubic ft box. So what size without driver and port displacement? I like the look of a slot port, tuning at 31hz or 25 or what?
No one WANTS a large box, it is just physics.. A car driver requires between 20-25% more volume if used in a home instead of a car. You are more than welcome to build a box based on cabin gain and put it in your house but you will be greatly disappointed unless you have eq and lots of power. Chris didn't make up a rule, he cited well established norms. Sorry if it's not what you wanted to hear..
Yes this is for home use, with home subwoofer plate amp. Where do I find home use sub drivers? Or how big would I have to make it or is 3.0 cubic feet the answer?
Hi,
No, Chris is citing simplistic opinion, not well informed fact.
Its simply the wrong driver for a 3cuft vented box, Vas is 1cuft.
Non standard alignments are not a disaster, just not standard.
rgds, sreten.
A vented box of 1.5cuft internal dimensions will be fine.
Reality will be the box is less due to the port and driver.
No, Chris is citing simplistic opinion, not well informed fact.
Its simply the wrong driver for a 3cuft vented box, Vas is 1cuft.
Non standard alignments are not a disaster, just not standard.
rgds, sreten.
A vented box of 1.5cuft internal dimensions will be fine.
Reality will be the box is less due to the port and driver.
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So a box with a total of 1.5 including port and driver is the correct size? What would be correct size without any displacements?
Hi, Your ported numbers are not ideal for home sub use, rgds, sreten.
Ported should optimise -6dB to -10dB.
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Are you sure that info you plugged in is correct? This are the specs for it
Woofer Specifications
Voice Inductance
@ 1kHz (Levc – mH) 3.05
Driver Radiating Area
(Sd – in2/cm2) 51.15/330
Compliance Volume
(Vas – ft3 / l) 1.03/29.2
Voice Coil DC Resistance
(Hvc – in/mm) (Revc – ohms) 4
Suspension Compliance
(Cms – ?m/N) 187
Surround
Hi-roll rubber
Magnetic Gap Height
(Hag – in/mm) 0.31/8
Mechanical Q
(Qms) 9.1
Voice Coil
2" (51mm) diameter
Electrical Q
(Qes) 0.48
Motor Force Factor
(Bl – Tm) 15.1
Maximum Excursion
(Xmax –in/mm) 0.57/14.5
Free-Air Resonance
(Fs – Hz) 28.7
Total Q
(Qts) 0.46
Diecast Aluminum Frame
Yes
Vented Polepiece
Yes
Low-Frequency Transducer
10" (254mm) Polypropylene cone
I'm getting radically different graphs with WinISD and Hornresp, using the published T/S parameters. Here's a screenshot of WinISD Pro. The green trace is your suggested ported box, the blue one is mine (75L tuned to 25Hz).
An externally hosted image should be here but it was not working when we last tested it.
According to my spec sheet, Vas=~2 cuft.
Perhaps there's more than one version out there?
An externally hosted image should be here but it was not working when we last tested it.
Chris
Edit - I'm stupid.
Turns out I was looking at the 12" version. I'll leave this up for posterity, or something...
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Hi, so we've been agreeing really all along ..., rgds, sreten.
1cuft Vas versus 2 cuft, Fs and Qts near identical.
1cuft Vas versus 2 cuft, Fs and Qts near identical.
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hi sreten
According to the sim, optimized box is 45L with Fb=25Hz. I'm not comfortable with box volume > Vas, that's why I decided to load it in a 25L. There's a bit of a hump but that's really a small sacrifice.
hi leo143
The T/S are correct. For box sim, only 4 parameters are required. Vas, Fs, Qes and Qts.
You may want to consider a bandpass too. Only 24L. A bit tight but should be possible.
According to the sim, optimized box is 45L with Fb=25Hz. I'm not comfortable with box volume > Vas, that's why I decided to load it in a 25L. There's a bit of a hump but that's really a small sacrifice.
hi leo143
The T/S are correct. For box sim, only 4 parameters are required. Vas, Fs, Qes and Qts.
You may want to consider a bandpass too. Only 24L. A bit tight but should be possible.
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