I did some measurements today of these 3 drivers in closed volumes. In my measurement room, 0,5m distance groundplane - so there is a little rrom influence left, but good enough for a comparison. Level is corrected for 1m freefield.
First SB34NRXL75-8. One of the best drivers I know, especially for that money. Very good use for a 3-way but could also be a subwoofer.
THD is incredible low - 1% at 105-110dBSpl! I use 2 of them in my new speakers ... that's enough for most rooms ;-)
Also 0,05% THD ... not often I measure that with a speaker!
Now SB29NRX75-6. My goto chassis for closed subwoofers, put 6 of them in my homecinema as SBA. Not expensive, doesn't need a big volume, not to heavy membrane, huge venting hole, 75mm coil, not to heavy membrane, noise free Xmax.
Frequency response already shows us this is no midrange chassis. THD is good at low frequencies but doesn't scale as it should at low levels! I know this behaviour from PA chassis, didn't expect it here. No problem for a woofer - but I would not use it up to a few hundred Hz.
And now the SB29NRX75-8. I expected something in the middle between these 2 according the datasheet - a smaller and cheaper alternative to the 12".
Nope - that's not what I need for a low mid driver. The same THD behaviour - it looks like about the same driver just with higer impedance coil.
All of these drivers had no problem at all with 25V -> 80W/8R sine power, you need a bigger amp as an AHB-2 to bring them to their limits.
SB Acoustics has some gems in their programm but their "normal" driver range can't compete with the best from ScanSpeak. They are half of the price - it's probably ok ;-)
I still recommend the SB29NRX75-6 for subwoofers - huge coil and perfect venting, these drivers can take power!
But their SB34NRXL75-8 ... is one of these gems. One of the best 12" available.
First SB34NRXL75-8. One of the best drivers I know, especially for that money. Very good use for a 3-way but could also be a subwoofer.
THD is incredible low - 1% at 105-110dBSpl! I use 2 of them in my new speakers ... that's enough for most rooms ;-)
Also 0,05% THD ... not often I measure that with a speaker!
Now SB29NRX75-6. My goto chassis for closed subwoofers, put 6 of them in my homecinema as SBA. Not expensive, doesn't need a big volume, not to heavy membrane, huge venting hole, 75mm coil, not to heavy membrane, noise free Xmax.
Frequency response already shows us this is no midrange chassis. THD is good at low frequencies but doesn't scale as it should at low levels! I know this behaviour from PA chassis, didn't expect it here. No problem for a woofer - but I would not use it up to a few hundred Hz.
And now the SB29NRX75-8. I expected something in the middle between these 2 according the datasheet - a smaller and cheaper alternative to the 12".
Nope - that's not what I need for a low mid driver. The same THD behaviour - it looks like about the same driver just with higer impedance coil.
All of these drivers had no problem at all with 25V -> 80W/8R sine power, you need a bigger amp as an AHB-2 to bring them to their limits.
SB Acoustics has some gems in their programm but their "normal" driver range can't compete with the best from ScanSpeak. They are half of the price - it's probably ok ;-)
I still recommend the SB29NRX75-6 for subwoofers - huge coil and perfect venting, these drivers can take power!
But their SB34NRXL75-8 ... is one of these gems. One of the best 12" available.