Yes. You can't pack two 12" woofers any smaller.
Surely the output of such topology is Dipole??
markus76 .... back chamber(s) resonance around 180hz ... front around 320hz ... is that about right?
Chamber resonanz is about 270Hz. Here's the impedance:
Note how the driver resonance decreased from 31Hz to 21Hz.
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Not as pretty as the one above due to only being a test box. Drivers are JBL GT5-15: GT5-15 | 15? single voice coil subwoofer | JBL US
Except at the extreme LFs, distortion is only ok...(taken at 1M).
On axis.
90 deg.
180 deg.
Only looks usable up to 100-125hz, which should be fine as the mid I have in mind is an AE TD-15M.
What intrigues me is the spider venting is exposed on the outside. I may cover it with another layer of ply on the outside just to see what happens to the response. It may help with LF extension, but it also may make the dipole peak worse, no?
Except at the extreme LFs, distortion is only ok...(taken at 1M).
On axis.
90 deg.
180 deg.
Only looks usable up to 100-125hz, which should be fine as the mid I have in mind is an AE TD-15M.
What intrigues me is the spider venting is exposed on the outside. I may cover it with another layer of ply on the outside just to see what happens to the response. It may help with LF extension, but it also may make the dipole peak worse, no?
🙂
The issue I see with that (and other 'slot loaded') is the difference between front and rear output.
If you notch the front output quarterwave, what happens to the back output ?
If smooth dipole radiation is desired then the front and back output needs to be as symmetrical as possible.
The issue I see with that (and other 'slot loaded') is the difference between front and rear output.
If you notch the front output quarterwave, what happens to the back output ?
If smooth dipole radiation is desired then the front and back output needs to be as symmetrical as possible.
Hi Markus,
What's your subjective opinion of your Ripole versus H-frame, for your particular setup?
Thanks!
Brendon
Hi Markus,
one more question, I've read somewhere that you delay your subs.. Did you try using them without delay? Can you tell the difference? Will I be good without delay?
thanks!
one more question, I've read somewhere that you delay your subs.. Did you try using them without delay? Can you tell the difference? Will I be good without delay?
thanks!
If you compare a "ripole" with Nelson Pass' "SLOB", it is evident where the symmetry is - and where not.
In a ripole you have the same notch/quarterwave situation in front and back. After all the cone can't move in different ways on its front and back side.
What is wrong with a subwoofer construction if the radiation pattern tends a little bit to cardioid?
There is no dipole radiation at low frequencies within an acoustically small room.
Here a dipole essentially behaves like two monopoles with one monopole inverted.
Not sure if this driver is qualified for Ripole use (parameters, vent hole). Did you get in contact with Axel Ridtahler? He can probably tell you right away if the driver works in a Ripole.
The H-frame configuration uses two 10" drivers whereas the Ripole uses four 12" drivers. This is 3 times the diaphragm size hence I prefer the Ripole for better power handling capabilities and lower cutoff frequency.
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