And this one:
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
V-bro I think we have the same tastes I love the look of all the speakers you posted.I'm thinking of something along the lines of the Jamo but using a 15" or 12" dual concentric for midrange and tweet duties.What woofers for 2x15" bass do you guys recommend.Prefer cast baskets.I am thinking about the Dayton rs15".
http://www.partsexpress.com/pe/pshowdetl.cfm?&Partnumber=295-468
http://www.partsexpress.com/pe/pshowdetl.cfm?&Partnumber=295-468
lazenna said:
v-bro said:Hi Lazenna, I think a great choice!
Don't let anybody tell you they aren't!
1. what makes a woofer a good choice for dipole? I mean what do we look for? Qms? Qts? Fs? Any guidelines?
2. That Dayton woofer looks well made but how ouwld it compare to old favs like the NHT1259, Bhrama, Shiva, Tumult or any of the drivers from Eminence (Kappa 15), Selenium (SLF 15), or even pro drivers like the JBL 2235 or Peavey low rider/pro rider subs.
I think if there's enough surface you don't need optimal Q. As long as you have suffiecient hub and surface anything will work, I think preferrably high Qms and Qes.
Allthoug my 'pro' seventies JBL 2220A have very low Qts and work quite nicely in a medium sized room and pretty large baffle (with sides) and the baffle placed in contact with the floor.
Allthoug my 'pro' seventies JBL 2220A have very low Qts and work quite nicely in a medium sized room and pretty large baffle (with sides) and the baffle placed in contact with the floor.
Can a maths expert tell us what happens to Qts and spl figures if we change a cone with another one with knowm mass , surface area and (expected ) resonance frequency ?
If you ask why , it's to guess what will happen if we graft a bigger cone on to a smaller frame. Say an 18 inch cone on to a 12 inch frame with various mods to the frame.
Qts should go up and Fs should fall , possibly Qms should go down. Sensitivity would suffer most I think.
Outlandish ... yes ! The web is full of far more outlandish things !
If you ask why , it's to guess what will happen if we graft a bigger cone on to a smaller frame. Say an 18 inch cone on to a 12 inch frame with various mods to the frame.
Qts should go up and Fs should fall , possibly Qms should go down. Sensitivity would suffer most I think.
Outlandish ... yes ! The web is full of far more outlandish things !
Trying to narrow down my search for bass drivers going by experience or specs which would seem to be better? Ficar audio SSD18
DUAL 1 | DUAL 2
Fs: 24.7 Hz | 24.3 Hz
Re: 0.75 Ohms/coil | 1.5 Ohms/coil
Qms: 4.88 | 4.96
Qes: .75 | .69
Qts: .65 | .61
Mms: 296g | 308g
Cms: 0.14mm/N | 0.14mm/N
Sd: 1210cm^2 | 1210cm^2
Vas: 285 l | 285 l
Spl: 89.4dB 1W/1m | 89.6dB 1W/1m
Bl: 9.3 N/A | 14.1 N/A
Xmax: 21mm
Rms: 800W
Sealed box: N/A cuft
Ported box: 6-10 cuft @ 33Hz
Sub OD: 18.500”
Cut ID: 16.750”
Mounting depth: 9.500”
Displacement: 0.22cuft
Product code: 01918
Price: $ 239.00
*shipping is included
Power Handling: 800 watts RMS
Sensitivity: 89db (2.83 volts)
Impedance: 4 Ohm Nominal (SVC)
Dimensions
Outside Diameter: 46.2cm (18 3/16")
Mounting Diameter: 42.4cm (16 11/16")
Depth: 24.8cm (9 3/4")
Recommended Box Sizes
Sealed: 130 litres (4.6 cu. ft.)
Ported: 200 litres (7 cu. ft.) 19Hz tuning
EBS: 350 litres (12.4 cu. ft.) 15Hz tuning
Mach5 audio IXL-18.4
T/S Parameters
Fs = 17.7 Hz
Re = 3.4 Ohms
Qes = 0.39
Qms = 5.59
Qts = 0.37
Mms = 434.3 grams
Rms = 8.69 kg/s
Cms = 0.184 mm/N
VAS = 274.1 litres
Sd = 1029.2 cm2
Xmax = 22 mm
Cone Diameter = 36.2 cm
$210.00
DUAL 1 | DUAL 2
Fs: 24.7 Hz | 24.3 Hz
Re: 0.75 Ohms/coil | 1.5 Ohms/coil
Qms: 4.88 | 4.96
Qes: .75 | .69
Qts: .65 | .61
Mms: 296g | 308g
Cms: 0.14mm/N | 0.14mm/N
Sd: 1210cm^2 | 1210cm^2
Vas: 285 l | 285 l
Spl: 89.4dB 1W/1m | 89.6dB 1W/1m
Bl: 9.3 N/A | 14.1 N/A
Xmax: 21mm
Rms: 800W
Sealed box: N/A cuft
Ported box: 6-10 cuft @ 33Hz
Sub OD: 18.500”
Cut ID: 16.750”
Mounting depth: 9.500”
Displacement: 0.22cuft
Product code: 01918
Price: $ 239.00
*shipping is included
Power Handling: 800 watts RMS
Sensitivity: 89db (2.83 volts)
Impedance: 4 Ohm Nominal (SVC)
Dimensions
Outside Diameter: 46.2cm (18 3/16")
Mounting Diameter: 42.4cm (16 11/16")
Depth: 24.8cm (9 3/4")
Recommended Box Sizes
Sealed: 130 litres (4.6 cu. ft.)
Ported: 200 litres (7 cu. ft.) 19Hz tuning
EBS: 350 litres (12.4 cu. ft.) 15Hz tuning
Mach5 audio IXL-18.4
T/S Parameters
Fs = 17.7 Hz
Re = 3.4 Ohms
Qes = 0.39
Qms = 5.59
Qts = 0.37
Mms = 434.3 grams
Rms = 8.69 kg/s
Cms = 0.184 mm/N
VAS = 274.1 litres
Sd = 1029.2 cm2
Xmax = 22 mm
Cone Diameter = 36.2 cm
$210.00
The 18.00ndw1 has a pretty nasty peak between 1 and 2 Khz. This is not a very big problem, but you can't get away with a simple 6db/oct filter....to say the least....
Furthermore they traded excursion for sensitivity, which is not a bad thing given the fact the woofer is BIG. The low resonance frequency comes in very nice.
Conclusion: It can work, but it needs a bit more effort....
Furthermore they traded excursion for sensitivity, which is not a bad thing given the fact the woofer is BIG. The low resonance frequency comes in very nice.
Conclusion: It can work, but it needs a bit more effort....
Here is an extreme dipole. I've no experience with ob but will have in the future. Like the bass from ob!
http://www.rauna.com/slides/speakerwalljpg.html
http://www.rauna.com/slides/speakerwalljpg.html
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