I have two of the following 3 cu ft sealed boxes.
https://www.parts-express.com/Knock...udio-15-Ultimax-Subwoofer-300-5024?quantity=1
I currently have a Cerwin Vega 15" woofer with cloth surround loaded in each cabinet.
While they work good and produce very clean sounding bass, they tend to run out of steam about 35Hz and using EQ to boost the output below 35Hz only makes them start to sound bad.
How well would this 15" driver work in those cabinets?
https://www.parts-express.com/DS18-...rbon-Fiber-Duat-Cap-4-Ohm-294-8072?quantity=1
Parts Express Staff Recommended Enclosure Volume
Sealed Volume 2.5ft³
Sealed F3 32Hz
If those won't work what subwoofer driver will?
The idea is to have an F3 of around 30Hz if not lower than that.
https://www.parts-express.com/Knock...udio-15-Ultimax-Subwoofer-300-5024?quantity=1
I currently have a Cerwin Vega 15" woofer with cloth surround loaded in each cabinet.
While they work good and produce very clean sounding bass, they tend to run out of steam about 35Hz and using EQ to boost the output below 35Hz only makes them start to sound bad.
How well would this 15" driver work in those cabinets?
https://www.parts-express.com/DS18-...rbon-Fiber-Duat-Cap-4-Ohm-294-8072?quantity=1
Parts Express Staff Recommended Enclosure Volume
Sealed Volume 2.5ft³
Sealed F3 32Hz
If those won't work what subwoofer driver will?
The idea is to have an F3 of around 30Hz if not lower than that.
The ZR15.2D will work OK in a 3 cubic foot net cabinet.
Whether the F3 will be 32Hz or slightly lower in your larger box depends on if it's TS parameters are correct, which the "Parts Express Staff" have not verified. The ZR15.2D are mostly used in car audio, so finding verified measurements is difficult.
Your cloth surround Cerwin Vega 15" may have ~5mm linear excursion, so would distort past 10mm peak to peak at ~102dB at 35Hz.
If the ZR15.2D actually has 25mm Xmax, given enough power it should do ~115dB at 50mm peak to peak, which may sound around four times louder at 35Hz than the CV.
Whether the F3 will be 32Hz or slightly lower in your larger box depends on if it's TS parameters are correct, which the "Parts Express Staff" have not verified. The ZR15.2D are mostly used in car audio, so finding verified measurements is difficult.
Your cloth surround Cerwin Vega 15" may have ~5mm linear excursion, so would distort past 10mm peak to peak at ~102dB at 35Hz.
If the ZR15.2D actually has 25mm Xmax, given enough power it should do ~115dB at 50mm peak to peak, which may sound around four times louder at 35Hz than the CV.
I don't know of any offhand.
Since you are using EQ, the F3 doesn't much matter if the driver doesn't exceed Xmax and it's or the amplifier power limits.
A 3 cu ft box is large enough to use decent size ports, the expense of a passive radiator to do the same thing is not warranted.
Ports or passive radiators can increase the output around Fb by 3-6dB (or more) over a sealed cabinet, so the F3 could be lower. There will be little useful output below Fb, response drops at ~24dB per octave vs 12dB per octave for a sealed cabinet below Fc, which is always higher than the driver's Fs.
Using a "donut" ring you could use a 12" driver in your cabinet, ported F3 25Hz.
A LAB12 at just 200 watts in your cabinet with two ports would be within a dB of the output of a sealed 15" at 30Hz requiring 24.4 mm excursion, which would require several times the power.
At 400 watts, the ported LAB 12 could exceed the output of the sealed ZR15.2D and still be under it's 13mm Xmax.
Attachments
Art, them Brazilian festival PA types of things with the transformers type of deploying cabs on semi trailers, is that still car audio?
I understand completely and it's my culture too. I spent 7yrs driving a Taxi with a JLAudio 12W7 in it, and it's amazing how many folks danced for joy around my cab
Building a reggae beachcat at the moment in the Bass Shelter thread, fun raftups with SUPs predicted
My wife and mum are spoiling me with a Brazilian 3K for my b'day today
This will replace the ageing 1000/1 in my car and will prolly run 4x ZR12.4Ds in my Subaru XV to replace the single 25yr old 12W7
The ZR series are very low sensitivity but can reach very low ina tiny box, still to see how loud they can go, but they have a solid reputation in the SQ scene
To the OP, the ZXI series is pretty awesome, check out the ZXI15.2D against the ZR15,2D. The datasheets for the DS18 dual coil drivers contain an anomaly in the electrical parameters and not reliable for simulations. Needs to be measured
Not a big fan of ported cabinets.
Will check those DS18 subs out.
So for the ZXI15.2D it lists these box specs.
Sealed Internal Volume
56.6L / 2ft3
Sealed Box Output Response F3
32Hz
https://ds18.com/products/ds18-zxi1...fer-2000-watts-2-ohm-dvc-quad-stacked-magnets
What would the F3 be for a 3 cu ft box?
Even if the F3 is not much lower in the larger box it is still lower than many other subs I looked at.
The depth is a no-go though at 10.51" as the cabinet brace would get in the way and other than cutting the brace I am not sure how to make it fit.
Will check those DS18 subs out.
So for the ZXI15.2D it lists these box specs.
Sealed Internal Volume
56.6L / 2ft3
Sealed Box Output Response F3
32Hz
https://ds18.com/products/ds18-zxi1...fer-2000-watts-2-ohm-dvc-quad-stacked-magnets
What would the F3 be for a 3 cu ft box?
Even if the F3 is not much lower in the larger box it is still lower than many other subs I looked at.
The depth is a no-go though at 10.51" as the cabinet brace would get in the way and other than cutting the brace I am not sure how to make it fit.
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Maybe the Dayton Audio RSS390HO-4 15" subwoofer is worth considering. It has a rated Xmax = 12 mm. The VituixCAD simulation of its response in a 3cuft (84.3 litre) enclosure is shown below.
In a vented-box enclosure we can get something like the following response.
Adding in an 80-Hz 4th-order Linkwitz–Riley low-pass filter we get the following response.
If we use a 3 cuft (85 litre) closed-box enclosure, we get the following response when an 80-Hz 4th-order Linkwitz–Riley low-pass filter is applied. The peak output of the closed-box system is about 4.5dB less than that of the vented-box system. Of course, the closed-box system won't suffer from port chuffing noises.
If we apply 3.5dB of parametric EQ at 30Hz with Q=2, the closed-box system can produce the following response, with a −3dB point of 25.9Hz. That gets the system comfortably below the 30Hz design upper limit, albeit at the expense of driving the subwoofer a bit harder.
Interesting. For that same Dayton Audio driver WinISD shows this assuming I did everything right.
The Dayton Audio does seem like a good choice though. I've used some of their other speakers and have always been pleased with them.
If I felt the need, what EQ could be applied to the Dayton Audio to extend the F3 lower?
The Dayton Audio does seem like a good choice though. I've used some of their other speakers and have always been pleased with them.
If I felt the need, what EQ could be applied to the Dayton Audio to extend the F3 lower?
If we look at the Eminence LAB15 15-inch subwoofer, we can get the following response. This includes the effect of an 80-Hz 4th-order Linkwitz–Riley low-pass filter.
Switching to a closed-box version of the above enclosure, we obtain the following low-pass filtered response.
If we would like to further extend the response using passive amplification, adding a series 800µF capacitor results in the following response.
Switching to a closed-box version of the above enclosure, we obtain the following low-pass filtered response.
If we would like to further extend the response using passive amplification, adding a series 800µF capacitor results in the following response.
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It would be possible to add a 2000µF series capacitor to lower the F3 of the closed-box system. The response plot below shows that an F3 = 24.5Hz should be possible.
Alternatively, it would be possible to apply 5dB of PEQ at 26.7Hz with Q=2 to get the following response, with the same F3 = 24.5Hz.
The capacitor interacts with the electrical impedance of the driver, which can be represented by an electrical equivalent circuit consisting of resistors, capacitors and inductors. The effects are driver/enclosure dependent.
In the case of the Dayton driver, the series capacitor introduces the following filter response into the system. Initially, the capacitor behaves like a 1st-order high-pass filter but then it introduces some equalization between 18Hz and 200Hz.
When the Linkwitz–Riley 4th-order 80Hz low-pass filter is added, we obtain the following composite response.
In the case of the Dayton driver, the series capacitor introduces the following filter response into the system. Initially, the capacitor behaves like a 1st-order high-pass filter but then it introduces some equalization between 18Hz and 200Hz.
When the Linkwitz–Riley 4th-order 80Hz low-pass filter is added, we obtain the following composite response.
@Tube Radio Are you planning to use a plate amplifier to drive your subwoofer? If so, which one are you considering?
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Putting this here for reference to make it easier for me to find.
https://www.parts-express.com/Dayto...-Series-HO-Subwoofer-4-Ohm-295-469?quantity=1
The plan is to use a regular stand alone amplifier. I'll either use a stereo amp with one sub per channel or a stereo amp in bridged mode with the subs wired in series.
https://www.parts-express.com/Dayto...-Series-HO-Subwoofer-4-Ohm-295-469?quantity=1
The plan is to use a regular stand alone amplifier. I'll either use a stereo amp with one sub per channel or a stereo amp in bridged mode with the subs wired in series.