I'd try the Seas CA22RNY. Its about as efficient and should sound very similar to the 21w54 depending on box tuning. The 21w54 is a good driver and has really nice specs for an 8" mineral/poly cone with a large VC. Same goes for the D52af mid, which is still one of the best 2 inch dome mids of its class. The problem with most dynaudio drivers is their tight VC gap, making them prone to VC rubbing over time from suspension sag and deformation. I have 4 brand new D52af mids and 2 of them decided to start buzzing out of the blue. Dynaudio can still fix those, but its very expensive. I've been using the Morel MDM55, CAM558 and EM1308 instead with good results.
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There is a better solution, Visaton G50FFL and they sell separately voice coil assemblies, should you ever need some.
Let's help CaryP with a filter solution once we know for sure what the replacement woofer is?
Let's help CaryP with a filter solution once we know for sure what the replacement woofer is?
There's 2 different versions of the G50FFL. The early one sounds better to me but isn't available anymore. The ferrofluid is also a drawback. The Morel mids sound more open, have better xmax and top end rolloff is very easy to work with.
Out of curiosity, I tried @profiguy's suggestion of CA22RNY. It seems a great fit, with a more linear response 1-2khz than the Dyn, which shows a dip. It also has closer sensitivity to the Dyn than the SB23 8ohm, and its impedance plot copying this transfer response is ruler flat in the passband. 👍
Red=Dynaudio, Green=SB23, Blue = CA22RNY
p.s. did also look at Seas U22, but it's not as good a fit as CA22RNY (sensitivity too low 100hz-500hz).
Red=Dynaudio, Green=SB23, Blue = CA22RNY
p.s. did also look at Seas U22, but it's not as good a fit as CA22RNY (sensitivity too low 100hz-500hz).
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Well that SEAS Driver really does seem like a great fit !.
I wish i had known that before i purchased the SB 23 ( 4 Actually as i need 4 for my next project ) and have already made the front baffle to suit the SB 23 on the original DYN Cabs ( have posted a pic the white ones).
Thanks heaps motokok for the circuit i can add , i will let you know how it goes as I'm sure i can hear the cone breakup.
lojzek thanks for looking into this,That 700 hz xover point is just from there the supplied info i had but your modelling does obviously suggests otherwise. It seems even Dynaudio use simple 1st order xovers
I wish i had known that before i purchased the SB 23 ( 4 Actually as i need 4 for my next project ) and have already made the front baffle to suit the SB 23 on the original DYN Cabs ( have posted a pic the white ones).
Thanks heaps motokok for the circuit i can add , i will let you know how it goes as I'm sure i can hear the cone breakup.
lojzek thanks for looking into this,That 700 hz xover point is just from there the supplied info i had but your modelling does obviously suggests otherwise. It seems even Dynaudio use simple 1st order xovers
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You have some very desirable vintage drivers there; a lot of people still covet the mid domes. Let us know how this swap works out.
Don't know the origin of this speaker/crossover design, but as @Lojzek indicates, even though it uses simple electrical elements, the acoustic response of each of these networks is not seeming to be truly 1st order. But if the speaker sounds good, then that's good.
I think the folks here would want to design a new XO for this!
Don't know the origin of this speaker/crossover design, but as @Lojzek indicates, even though it uses simple electrical elements, the acoustic response of each of these networks is not seeming to be truly 1st order. But if the speaker sounds good, then that's good.
I think the folks here would want to design a new XO for this!
First order is popular and the reason is often given that it has a minimal phase shift.
I'm not so sure. I find that when working without measurements, low orders are easier to blend. Mistakes stand out more with higher orders. Also things like running into breakup, although they won't be fixed, can be smoothed over with low orders. For this reason drivers like the CA22RNY have become popular.
Higher orders, of course, don't have to be a problem.
I'm not so sure. I find that when working without measurements, low orders are easier to blend. Mistakes stand out more with higher orders. Also things like running into breakup, although they won't be fixed, can be smoothed over with low orders. For this reason drivers like the CA22RNY have become popular.
Higher orders, of course, don't have to be a problem.
I am not sure about others, I myself though might contribute to altering this basic simple filter into something a bit better, not so basic anymore, but simple enough. Regarding Dynaudio incorporating 1st order filters, they are known to do so but with one significant distinction, choosing the right value for the desired x/o frequency.
CaryP, what do you think of it?
Thanks for the offer lojzek ,if you think the x over could be greatly improved I would really appreciate your input.
Yes.
V= square root of (impedance * power) here square root of (8 x 60) = 21.9v
Sim shows the driver can drop to 4ohm in the circuit. Put in whatever your amp is.
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Ok, have put the circuit in existing crossover and on initial listening,seems to have helped with the cone breakup.
many thanks for your input
The other issue I seem to have since I have moved house and now have a converted garage as a media room i have a lack of bass output down low.
I have these speakers which never had that problem and have also since made the Paul Carmody Tarkus speaker and also the SB Acoustics Arya as well and they also suffer from this issue?
does anyone have any thoughts on what could be the issue?
I have these speakers which never had that problem and have also since made the Paul Carmody Tarkus speaker and also the SB Acoustics Arya as well and they also suffer from this issue?
does anyone have any thoughts on what could be the issue?
That doesn't tell us much, but rooms are a significant factor in general... By the way, this usually means in regards to room modes, which you should look at for taking control. However there is the possibility your new room is more highly damped. Are the walls flexible?