Update...
After living with the speakers for a while, they became my reference units. The Neos are really something - I suppose their attack - decay times make them sound "different".
Bad thing is - I blew a CA21REX.
Oh. Well, I didn't "blow" it. Or maybe I did. I was listening to the Blue Man Group, and one of the woofers started making a rapping noise. I was pretty sure I blew it. But when I looked at it, it was fine (the cone, that is) - the tinsel leads came apart from the cone, and the voice coil wire broke down. No matter what I did, I couldn't fix it.
And, I realized Madisound doesn't carry the CA21REX anymore. I think Solen still does, but it's a different CA21REX - apparently, Madisound had an "Innersound" branded model with slightly different specs. Anyway...
Looking for a replacement woofer, I found the SEAS CA22RNX. Close enough, but the frame is a bit bigger, and my grilles are tightly built around it. So it wouldn't be very useful. And the T/S & efficiency parameters aren't even alike.
Metal cones (like the RS-225) were out of the question. I simulated the in-box response of it, and efficiency was way down, and the crossover became extremely complex from taming the upper peaks.
I settled on the SEAS P21RF/P. Same size as my old CA21, the T/S parameters matched the enclosure.. although efficency will go down at least 3 dB. It's a champ, though - in box speaker response is beautiful - I bet many people could get away with a 2nd order acoustic response with just an inductor.
Anyway, I just took some new measurements of the drivers in box. Much to my surprise, the Neo8 changed its performance quite a bit - it has more output in the lower midrange (around 800 Hz or so). The Neo3's response is as terrible as always (since those were used units, I'm not surprised).
I've modified the crossover so that it can use the 21RF/P unit. I need to take some off-axis measurements before posting it, though - I need to make sure the off-axis response takes care of the jagged FR of the Neo8 and Neo3.
Well, at least now the design is current again - since it's using available drivers.
BTW - now I know why SEAS is a bit more expensive than Dayton. I don't know about motor specifics, but SEAS and Peerless shure have beautiful FR curves... so smooth and easy to work with.
After living with the speakers for a while, they became my reference units. The Neos are really something - I suppose their attack - decay times make them sound "different".
Bad thing is - I blew a CA21REX.
Oh. Well, I didn't "blow" it. Or maybe I did. I was listening to the Blue Man Group, and one of the woofers started making a rapping noise. I was pretty sure I blew it. But when I looked at it, it was fine (the cone, that is) - the tinsel leads came apart from the cone, and the voice coil wire broke down. No matter what I did, I couldn't fix it.
And, I realized Madisound doesn't carry the CA21REX anymore. I think Solen still does, but it's a different CA21REX - apparently, Madisound had an "Innersound" branded model with slightly different specs. Anyway...
Looking for a replacement woofer, I found the SEAS CA22RNX. Close enough, but the frame is a bit bigger, and my grilles are tightly built around it. So it wouldn't be very useful. And the T/S & efficiency parameters aren't even alike.
Metal cones (like the RS-225) were out of the question. I simulated the in-box response of it, and efficiency was way down, and the crossover became extremely complex from taming the upper peaks.
I settled on the SEAS P21RF/P. Same size as my old CA21, the T/S parameters matched the enclosure.. although efficency will go down at least 3 dB. It's a champ, though - in box speaker response is beautiful - I bet many people could get away with a 2nd order acoustic response with just an inductor.
Anyway, I just took some new measurements of the drivers in box. Much to my surprise, the Neo8 changed its performance quite a bit - it has more output in the lower midrange (around 800 Hz or so). The Neo3's response is as terrible as always (since those were used units, I'm not surprised).
I've modified the crossover so that it can use the 21RF/P unit. I need to take some off-axis measurements before posting it, though - I need to make sure the off-axis response takes care of the jagged FR of the Neo8 and Neo3.
Well, at least now the design is current again - since it's using available drivers.
BTW - now I know why SEAS is a bit more expensive than Dayton. I don't know about motor specifics, but SEAS and Peerless shure have beautiful FR curves... so smooth and easy to work with.
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