Are there any opinions on the Celestion CF0820BMB? I might want to use it as a woofer in a compact 3-way bass reflex speaker with a net volume of just under 30 liters. The driver should work up to a maximum of 1 kHz, a 2'' midrange dome tweeter would then take over.
Best regards
Michael
Best regards
Michael
As I understand it, as I've also seen demonstrated many times. Ported speakers usually require around double the volume as the same driver in a closed box. So that is going to be tricky with your requirements.
Any reason for the Celestion - do you already have it on the shelf? Because I always feel it's tricky to make them look nice with the PA foam edge, that are supposed to make them be mounted from the inside of the cabinet.
The Celestion is a good deal for a nice paper cone driver with a bit more sensitivity than most hifi woofers. The drawback it has is the stiff spider prone to resonances. Crossed lower in a 3 way its a suitable driver if you can put up with the higher than usual Fs for its size.
The Audax HM210C0 is a better driver on many levels. Plays very low while having nice extended midrange and suitable for a large 2 way with matching tweeter. The CF cone and soft dust cap are the best of both materials. Capable of highly resolving bass, clean mids and easy to cross.
The Audax HM210C0 is a better driver on many levels. Plays very low while having nice extended midrange and suitable for a large 2 way with matching tweeter. The CF cone and soft dust cap are the best of both materials. Capable of highly resolving bass, clean mids and easy to cross.
I'm searching a woofer for a ported 3-way-kompakt-Speaker. I've made a Q&D-simulation of the Celestion in WinISD, f3 of 45 in roundabout 30 litres seems to be reachable.
Maybe there are nicer edges out there but there is no PA foam on this one (picture ist from the Celestion-website):
But looking at the TSP I assume that a much larger volume is requiered for a flat response than for the Celestion. And as I wrote before the woofer has not to be combined with a tweeter in a 2-way-speaker, a crossover frequency of 1 kHz would be the maximum.
Kind regards
Michael
I'm looking for a high efficiency, high Xmax woofer to use in a passive cardioid from 100 Hz to 400 Hz
Thus the need for high Xmax. I initially choose Purifi PTT8 but its relatively low efficiency means >500W are needed to get to SPL target.
Now I'm considering Faital Pro 8PR200, which has Xmax 8.1 mm and 95 db sensitivity.
Any other suggestions?
Thus the need for high Xmax. I initially choose Purifi PTT8 but its relatively low efficiency means >500W are needed to get to SPL target.
Now I'm considering Faital Pro 8PR200, which has Xmax 8.1 mm and 95 db sensitivity.
Any other suggestions?
Take care with Xmax specification as manufacturers use different formulas to specify Xmax.
Faitalpro does not use the most widely used formula (winding length - magnetic gap length)/2 but a different formula with "gives" higher values for Xmax (check their datasheets).
Based on forementioned formula, Xmax of 8PR200 is ~ 5 mm.
Faitalpro does not use the most widely used formula (winding length - magnetic gap length)/2 but a different formula with "gives" higher values for Xmax (check their datasheets).
Based on forementioned formula, Xmax of 8PR200 is ~ 5 mm.
Very interesting thread, with a lot of good inputs.
@digitalthor: From memory I think you mentioned cabinet of 60 liters for two 8" drivers. In passive world that makes sense and I also think one should not push the limits too much just because one can. For example 2xSatori 9 1/2" is maybe pushing it in 40 liters.
But it looks like 2*Dayton RS225 8" Alu is okay with 40 liters.
Here is some simulations aimed at 100 dB. Think that is pretty high SPL for one speaker.
One of the traces is 60 liters.
The other with light Linktwitz tranform in 40 liters.
Going down to more sane listening. Maybe louder than most would play with a bit more boost theoretical F3 at 32 Hz we have around 10 dB headroom before x-max.
Who knows if it is better than your NRX you have already.
If I had to pick at this moment, and I had none of the drivers at hand, I think Dayton is a good bet. Good SPL in 40 liters with no more than 50 Watt after boosting.
@digitalthor: From memory I think you mentioned cabinet of 60 liters for two 8" drivers. In passive world that makes sense and I also think one should not push the limits too much just because one can. For example 2xSatori 9 1/2" is maybe pushing it in 40 liters.
But it looks like 2*Dayton RS225 8" Alu is okay with 40 liters.
Here is some simulations aimed at 100 dB. Think that is pretty high SPL for one speaker.
One of the traces is 60 liters.
The other with light Linktwitz tranform in 40 liters.
Going down to more sane listening. Maybe louder than most would play with a bit more boost theoretical F3 at 32 Hz we have around 10 dB headroom before x-max.
Who knows if it is better than your NRX you have already.
If I had to pick at this moment, and I had none of the drivers at hand, I think Dayton is a good bet. Good SPL in 40 liters with no more than 50 Watt after boosting.
Another example: 2*Satori 9 1/2" 8ohm in 60 liters. With and without LT:
As you can see on paper/simulation because it is 2,5 times more expensive than the Dayton Alu, it does not translate to miracle results when we look at SPL.
I guess this has most to do with that we need to move a lot of air to see a significance difference.
Did anyone compare Dayton RS225 Alu to some of the other drivers mentioned?
As you can see on paper/simulation because it is 2,5 times more expensive than the Dayton Alu, it does not translate to miracle results when we look at SPL.
I guess this has most to do with that we need to move a lot of air to see a significance difference.
Did anyone compare Dayton RS225 Alu to some of the other drivers mentioned?
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Just ordered 4 of them. Should receive them in the beginning of next week. I will follow up with all sorts of test and pictures of them
@digitalthor: Looking forward to hear what you think about them. Think they are also my best bet.
Here some simulations:
Two of those wavecor (8ohm).First we have 70 Liters and 40 liters with no EQ. Compression window in Vcad changes a bit.
Then a pair in 40 liters with LT to F3 40 hz at 100 dB and 90 db.
Reason I picked 40 liters is because that it my own contraints in my build. Of course best case is to test what sounds best, but from the sim i think 40 liters will be okay. Also with example Hypex Fusion 125 (125 Watt 4 ohm), it would do just fine. Maybe bit bigger than 40 liter is better, but not sure one could hear the difference in practice if we add LT.
Here some simulations:
Two of those wavecor (8ohm).First we have 70 Liters and 40 liters with no EQ. Compression window in Vcad changes a bit.
Then a pair in 40 liters with LT to F3 40 hz at 100 dB and 90 db.
Reason I picked 40 liters is because that it my own contraints in my build. Of course best case is to test what sounds best, but from the sim i think 40 liters will be okay. Also with example Hypex Fusion 125 (125 Watt 4 ohm), it would do just fine. Maybe bit bigger than 40 liter is better, but not sure one could hear the difference in practice if we add LT.
A 15" is better ! A 8" is not at ease below 100Hz... But if you have size constraints...
