Kilomax nod...
I was talking to Rudolf about the positive sims on the Kilomax Pro 18 A driver by Eminence. He knows of two diffeerent builders who have used this driver one with zero baffle. Both have had no problems with back side driver noise. So I think that we can place the Kilomax on the positive list of big bad dipole drivers. Simulations show Kilomax (pair) output limit of 107.9 db @ 20 Hz., 115 @30 Hz. and 120db @ 40 Hz.
The Eminence Delta 15 LFA also looked excellent on simulations but still no confirmation of low noise yet. These drivers would be well worth a try in either a Ripole or "W" frame dipole if anybody has a pair. A pair are capable of high levels of bass output at 20 Hz. (98.4 db), 106.5db@ 30 Hz. and 111.5 db@ 40 Hz.. This is very respectable for such an inexpensive driver in such a small package.
I was talking to Rudolf about the positive sims on the Kilomax Pro 18 A driver by Eminence. He knows of two diffeerent builders who have used this driver one with zero baffle. Both have had no problems with back side driver noise. So I think that we can place the Kilomax on the positive list of big bad dipole drivers. Simulations show Kilomax (pair) output limit of 107.9 db @ 20 Hz., 115 @30 Hz. and 120db @ 40 Hz.
The Eminence Delta 15 LFA also looked excellent on simulations but still no confirmation of low noise yet. These drivers would be well worth a try in either a Ripole or "W" frame dipole if anybody has a pair. A pair are capable of high levels of bass output at 20 Hz. (98.4 db), 106.5db@ 30 Hz. and 111.5 db@ 40 Hz.. This is very respectable for such an inexpensive driver in such a small package.
Hi,
To me it looks like this guy
http://www.rcf.it/VediMacro.phtml/IDMacro/1627/L15P530/
could be a possible candidate for ripole experiments:
with the following TPS:
Resonance frequency, Fs 45 Hz
DC resistance Re 5.1 Ohm
Mechanical factor Qms 7.5
Electrical factor Qes 0.51
Total factor Qts 0.48
BL factor BL 15.3 T - m
Effective Moving Mass Mms 83 gr
Equivalent Cas air load Vas 160 liters
Effective piston area Sd 0.085 m2
Max. linear excursion (mathematical) Xmax 6.5 mm
Voice - coil inductance @ 1kHz Le1k 1.45 mH
Half-space efficiency Eff 2.76 %
driver, with
What's your opinion, all more experienced builders?
To me it looks like this guy
http://www.rcf.it/VediMacro.phtml/IDMacro/1627/L15P530/
could be a possible candidate for ripole experiments:
with the following TPS:
Resonance frequency, Fs 45 Hz
DC resistance Re 5.1 Ohm
Mechanical factor Qms 7.5
Electrical factor Qes 0.51
Total factor Qts 0.48
BL factor BL 15.3 T - m
Effective Moving Mass Mms 83 gr
Equivalent Cas air load Vas 160 liters
Effective piston area Sd 0.085 m2
Max. linear excursion (mathematical) Xmax 6.5 mm
Voice - coil inductance @ 1kHz Le1k 1.45 mH
Half-space efficiency Eff 2.76 %
driver, with
What's your opinion, all more experienced builders?
Closed spider might be a problem, yes.
OTOH I somehow got an impression that those problems were mostly connected only to cheapest drivers.
You wont know unless you try....
Wouldn't anyway consider tracheostomy wiht my pair of them
( Yes, I have a pair of them in my current active OB, so I am thinkin mostly N-frame )
OTOH I somehow got an impression that those problems were mostly connected only to cheapest drivers.
You wont know unless you try....
Wouldn't anyway consider tracheostomy wiht my pair of them
( Yes, I have a pair of them in my current active OB, so I am thinkin mostly N-frame )
Not to be asumed...
as mentioned previously a driver with a sealed spider does not necessarilly it will have a lot of spider noise. The Eminence Kilomax Pro 18A is an example. I would imagine that xmax would certainly come into play with respect to this. That said I think that a hands on physical test is what is required to determine if driver noise will be a design issue.
as mentioned previously a driver with a sealed spider does not necessarilly it will have a lot of spider noise. The Eminence Kilomax Pro 18A is an example. I would imagine that xmax would certainly come into play with respect to this. That said I think that a hands on physical test is what is required to determine if driver noise will be a design issue.
I have a dumb question...how can I differentiate between a sealed spider and an open spider woofer? I searched for peerless sls pictures on the net, but did not found detailed pictures from the motor part (where I imagine the difference is). I also looked at the official ripole driver: it has got an open hole through the magnets (I mean, all magnets do have holes, but in this speaker they seem not to be filled up with whatever stuff) but I doubt this is the only issue to make a speaker 'vented'.
Many thanks for your time
Erik
Many thanks for your time
Erik
Here is a DVC 12" subwoofer that has some specifications that should work for this application.
I have been using this driver in a down firing sealed 2.5 cu ft cabinet for over 12 years without a problem. They play in the lower 30 Hz range -3db without any boost in my cabinets.
Gold Sound 1240 DVC 12" with Polypropylene cone and 4 ohm coils at $98 each, the last time I checked.
FYI
http://www.goldsound.net/component-thiele.htm
I have been using this driver in a down firing sealed 2.5 cu ft cabinet for over 12 years without a problem. They play in the lower 30 Hz range -3db without any boost in my cabinets.
Gold Sound 1240 DVC 12" with Polypropylene cone and 4 ohm coils at $98 each, the last time I checked.
FYI
http://www.goldsound.net/component-thiele.htm
The Selenium 15PW3-SLF 15" looks like a good candidate for the Ripoles.
Specifications:
Frequency response: 40-4,000 Hz
Fs: 37 Hz
SPL: 98 dB 1W/1m
Vas: 9.67 cu. ft.
Qts: .61
Xmax: 3.0mm
Reasonable price as well...
http://www.partsexpress.com/pe/pshowdetl.cfm?&DID=7&Partnumber=264-338&scqty=4
Anyone have experience with the Selenium drivers? What did you think of the build quality and sound?
Specifications:
Frequency response: 40-4,000 Hz
Fs: 37 Hz
SPL: 98 dB 1W/1m
Vas: 9.67 cu. ft.
Qts: .61
Xmax: 3.0mm
Reasonable price as well...
http://www.partsexpress.com/pe/pshowdetl.cfm?&DID=7&Partnumber=264-338&scqty=4
Anyone have experience with the Selenium drivers? What did you think of the build quality and sound?
Re: My mistake...
Hello,
New here...
so....
made some OB, horns and stuff...
and very small tube amps..
did anybody ever build 12" ripoles?
i need a little extra sub from 150Hz down and i like the design..
http://timeandtubes.blogspot.com/
moray james said:
Hello,
New here...
so....
made some OB, horns and stuff...
and very small tube amps..
did anybody ever build 12" ripoles?
i need a little extra sub from 150Hz down and i like the design..
http://timeandtubes.blogspot.com/
Hi
I am going to build a ripole with a 12inch peerless SLS. My questions are:
1. What other driver can I buy locally in Australia that will outperform the SLS.
2. Will quality of driver have a major effect on overall sound qaulity or is it more about getting the enclosure/XO correct for the selected driver.
3. Has anyone implemented a ripole with the 12" SLS. If so, are you happy with it and if so would you post your dimensions etc
Thanks
Chris
I am going to build a ripole with a 12inch peerless SLS. My questions are:
1. What other driver can I buy locally in Australia that will outperform the SLS.
2. Will quality of driver have a major effect on overall sound qaulity or is it more about getting the enclosure/XO correct for the selected driver.
3. Has anyone implemented a ripole with the 12" SLS. If so, are you happy with it and if so would you post your dimensions etc
Thanks
Chris