Alcaps don’t necessarily deteroriate, checks of old crossovers prove that. And take into account that speaker units deteriorate too.
As to BSC in small speakers, this is more often than not implemented in a coarse way, if applied at all. Anyone that has performed proper measurements knows that only with an educated or lucky baffle dimension design the big coil solution works.
And Dayton… well, there are real gems in their product line, some outperforming many much more expensive drivers.
As to BSC in small speakers, this is more often than not implemented in a coarse way, if applied at all. Anyone that has performed proper measurements knows that only with an educated or lucky baffle dimension design the big coil solution works.
And Dayton… well, there are real gems in their product line, some outperforming many much more expensive drivers.
@markbakk, I refurbished few loudspeakers with Alcaps et all. More than 30 yo each time.
The swap with fresh ones each time proved the opposite. If the capacitance does not move that much (10 to 20 %) when a precise filter shematic was edited by the manufacter (Kef ref serie for instance with precise values), I was said BP have leakage in time. Each time I noticed a big sounding improvement.
In the op case however, circa 3 years only... they are fresh and healthy, breaked in.
I think tones member want to play a little with his Proac and experiment with parts.
He will maybe measure the size of the mkps marked Proac and find what oem brand it is by looking at datasheets (I suspect Solen oem or Clarity Cap oem)
The swap with fresh ones each time proved the opposite. If the capacitance does not move that much (10 to 20 %) when a precise filter shematic was edited by the manufacter (Kef ref serie for instance with precise values), I was said BP have leakage in time. Each time I noticed a big sounding improvement.
In the op case however, circa 3 years only... they are fresh and healthy, breaked in.
I think tones member want to play a little with his Proac and experiment with parts.
He will maybe measure the size of the mkps marked Proac and find what oem brand it is by looking at datasheets (I suspect Solen oem or Clarity Cap oem)
As you already mentioned, MTM is notorious for its poor vertical axis measurement.
In the Proac DT8, the differences in vertical response is compounded by using two different "M" drivers- the acoustic crossover is different for each driver using the same component values.
The changes to the crossover capacitor values will result in a different vertical alignment for either 8", and different floor and ceiling reflection contribution at the listening position.
Initially, "different" may sound "better"...
yeah man the dig wasn’t at you or anyone in particular.
i know Dayton has some good stuff.
im just gonna get some jumper caps and experiment
as I said. Make the 16uf foil cap i got now to 18uf. See what happens. Will it sound like the ALCAP 18uf? Don’t know. Yet to be seen. I think it will be very similar.
By not doing so, manufacturer actually made you a favor. Now you can prove your diy skills in making improvements. Right?
yes that makes total sense.
the drivers are super similar tho from an impedance plot I saw online.
does that say that they are almost the same?
here let me find it and attach
And here is the link to it
https://planethifi.com/proac-response-dt8/
Attachments
huh?
im not trying to prove anything.
i don’t understand what you are saying.
as I said before I see this as a great project for learning and having fun.
nothing more nothing less
That impedance plot is comparing the left hand speaker system with the right hand one.
It shows excellent pairing of the left and right speaker systems and the care taken in their manufacture.
It shows excellent pairing of the left and right speaker systems and the care taken in their manufacture.
Last edited:
I like to think I helped in your other threads, e.g., in considering the pros and cons of changing your iron core inductors for air core.
We actually set off on the right foot, and hopefully we can march foward together with equanimity!
I like to think I helped in your other threads, e.g., in considering the pros and cons of changing your iron core inductors for air core.
We actually set off on the right foot, and hopefully we can march foward together with equanimity!
hopefully.
The two entire loudspeaker impedance response matching says nothing about the different responses of the different woofers.
Even if the two different woofers in each cabinet's raw impedance curves matched (unlikely) each other, their acoustic response could still be quite different.
I'd guess the lower driver rolls off at a steeper rate and/or lower than the upper, near field measurements of each would make the differences easily visible.
ah, so I can take measurements of both drivers separately , and how close should the mic be? gated?
thanks !
For those not familiar with the ProAc DT8, the two woofers are very different.
The cone of the top woofer is made of thin polypropylene.
The cone of the bottom woofer is polypropylene with an admixture of mica and, in addition, this driver has an "amazingly" small magnet.
The two different 6.5" drivers are said to have been "optimised to reproduce different frequencies" while using a simple low order crossover.
The cone of the top woofer is made of thin polypropylene.
The cone of the bottom woofer is polypropylene with an admixture of mica and, in addition, this driver has an "amazingly" small magnet.
The two different 6.5" drivers are said to have been "optimised to reproduce different frequencies" while using a simple low order crossover.