Hi. Need a spot of advice here. I have a couple of JBL GT5-12 drivers and I want to build an enclosure (or enclosures) to make the most of them. I have an amp that delivers about 400w per channel.
I love deep, open, airy bass and have an ideal spot that is around 50cm x 50cm x 150cm for either one or two cabinets. Should I go sealed box, ported box or something a little more exotic? Are they best in their own boxes or both in a single box? Advice on size and type would be very much appreciated - and I can let you know how things turn out once I've built them!
I love deep, open, airy bass and have an ideal spot that is around 50cm x 50cm x 150cm for either one or two cabinets. Should I go sealed box, ported box or something a little more exotic? Are they best in their own boxes or both in a single box? Advice on size and type would be very much appreciated - and I can let you know how things turn out once I've built them!
I don’t know from the driver if a ported or sealed enclosure will work best as I haven’t modelled it.
But I can say that if you can find 2 sports and have 2 enclosures apart from each other it will sound better.
Rather than 2 in same box in same place. It’s the different places that make the response much better.
But I can say that if you can find 2 sports and have 2 enclosures apart from each other it will sound better.
Rather than 2 in same box in same place. It’s the different places that make the response much better.
I did wonder about the benefits of separate locations. That is certainly possible.
Here are the driver specs, should anyone feel inclined to use some clever software! :
Mechanical Q(Qms) 6.39
Magnetic Gap Height(Hag – in/mm) 0.315/8
Motor Force Factor(Bl – Tm) 15.2
Voice Coil Height(Hvc – in/mm) 1.43/36.4
Maximum Excursion(Xmax –in/mm) 0.56/14.2
Suspension Compliance(Cms – ?m/N) 135
Free-Air Resonance(Fs – Hz) 29
Driver Radiating Area(Sd – in2/cm2) 82.15/530
Voice Inductance@ 1kHz (Levc – mH) 1.26
Diecast Aluminum FrameNo
Voice Coil DC Resistance(Revc – ohms) 4
Vented PolepieceYes
SurroundHi-roll rubber
Electrical Q(Qes) 0.64
Low-Frequency Transducer12" (305mm) Polypropylene cone
Compliance Volume(Vas – ft3 / l) 1.9/54.2
Voice Coil2" (51mm) diameter
Progressive SpiderYes
Total Q(Qts) 0.58
Here are the driver specs, should anyone feel inclined to use some clever software! :
Mechanical Q(Qms) 6.39
Magnetic Gap Height(Hag – in/mm) 0.315/8
Motor Force Factor(Bl – Tm) 15.2
Voice Coil Height(Hvc – in/mm) 1.43/36.4
Maximum Excursion(Xmax –in/mm) 0.56/14.2
Suspension Compliance(Cms – ?m/N) 135
Free-Air Resonance(Fs – Hz) 29
Driver Radiating Area(Sd – in2/cm2) 82.15/530
Voice Inductance@ 1kHz (Levc – mH) 1.26
Diecast Aluminum FrameNo
Voice Coil DC Resistance(Revc – ohms) 4
Vented PolepieceYes
SurroundHi-roll rubber
Electrical Q(Qes) 0.64
Low-Frequency Transducer12" (305mm) Polypropylene cone
Compliance Volume(Vas – ft3 / l) 1.9/54.2
Voice Coil2" (51mm) diameter
Progressive SpiderYes
Total Q(Qts) 0.58
A simple OD-QW will beat any bassreflex. Usable between 20 Hz and 100 Hz.
Just make the cross section twice as large for a dual driver version.
I would make it 183,6 cm tall, 36,3 cm wide and 41,8 cm deep outer dimensions, everything made out of 18 mm plywood.
The driver should sit with its center 125,3 cm up from the inside bottom of the closed end.
The pipe has a cross section 33 x 18,2 cm.
The driver should sit with its center 125,3 cm up from the inside bottom of the closed end.
The pipe has a cross section 33 x 18,2 cm.
Thata excellent, thanks. I can manage the 183.6cm length ok. If I lay them on their side can I just make the port in the end rather than the two sides?
This is a 33 Hz tuned ODQW for a 12 inch car audio bass driver.
It is used lying down on its side under the table, with the mouth radiating into a corner. A very nice sounding and potent computer sub. With 400 watts it makes everything in our house pulsate and vibrate violently. With just a few watts it makes a great home theater and computer gaming sub.
Just a thought in case you haven't. Make sure that your "spots" are suitable before you commit to a design. In a given room, there may be only a few spots that will produce good results for sub placement. There are many threads on finding the spots. Some locations may produce almost no bass at the listening position. I sure learned this the hard way.
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