It depends on the size of the speaker and then distance to side walls. The room will add in some reinforcement but only at the lower frequencies. If you're working with a narrow design then bafflestep starts quite high up in frequency. I wouldn't say you would need the full 6dB, but you can definitely need 4-5dB.
Those estimates are not quite correct. Bass is not getting as much loss due to the floor gain (back walls are another story). That's only lower midrange that is getting full baffle step. All depends on baffle and transducer placement.
Thanks all. I don’t want to derail the thread but thanks a lot for the input. I have wondered about this topic for a while.
Of course. But we're talking about a narrow stand mount design. You only get appreciable floor gain to the bass when the bass driver is mounted close to the floor and the front baffle extends down to the floor as well.
Speaking of 3 inch dome midranges I wonder if any of you have tried these yet ? https://world.taobao.com/item/623008138495.htm?spm=a21wu.12321156.0.0.6d1f6ea9cazUYW
The Paiyon P81 P82 looks pretty serious and the midrange 6.2 kg in weight with some interesting specs anyway a HiFi compass test would be interesting - The specs are more of what I was hoping for with the SB acoustic dome recently released
The Paiyon P81 P82 looks pretty serious and the midrange 6.2 kg in weight with some interesting specs anyway a HiFi compass test would be interesting - The specs are more of what I was hoping for with the SB acoustic dome recently released
This is a ATC SM75-150. I've own that one few years ago and i found that The SB midrange dome is better for my application because it can be run much higher. The 400hz-1000hz band can be run by any Speaker, this is less the case with 1khz-5khz.
I tried to edit my post above -it certainly is inspired by that ATC -but hopefully improved - it is certainly not cheap so hopefully the quality is good
It's called Paiyon DM6A-82-10P. It's not a copy of ATC but surely inspired. Poor motor by the looks anyway.
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Yeah, it's silly that Google apparently couldn't figure that out..... 🙁
so it's 400 euro
that is very pricey venture into unknown territory, albeit a Ripoff with a capital R. But then again, the ATC is also basically a rip off of the classic SEL ITT 50mm dome of 1968.
Motor issue is no copper cap or shorting rings. Impedance starts rising at only 1500Hz and is 50 ohms by 20KHz. With a good motor this driver could have flat output to above 10KHz (on axis)
Unless you really want to use them for nostalgic or vintage reasons, there are plenty of other good mid-range domes out there.
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-Huge conclusions based on ? If you look at the loudspeakers they have put this into I suspect it would actually be a very good driver -remember China landed on the far side of the moon, the leader in Ai and has all the rare earths needed to make any magnet structure they want - so why would they make this a poor design? Anyway I value your opinions.
Paiyon are not a company that just slaps any old driver in a box -the P82 crossover looks very well designed to extremely tight tolerances. And to go to all that effort of using their own drivers when they have a good relationship with Peerless.
Anyway this company is just starting its upward trajectory - perhaps in 10 years they may amaze us all
The smaller 3 way P81se also using this driver Log into Facebook
-Huge conclusions based on ? If you look at the loudspeakers they have put this into I suspect it would actually be a very good driver -remember China landed on the far side of the moon, the leader in Ai and has all the rare earths needed to make any magnet structure they want - so why would they make this a poor design? Anyway I value your opinions.
Paiyon are not a company that just slaps any old driver in a box -the P82 crossover looks very well designed to extremely tight tolerances. And to go to all that effort of using their own drivers when they have a good relationship with Peerless.
Anyway this company is just starting its upward trajectory - perhaps in 10 years they may amaze us all
The smaller 3 way P81se also using this driver Log into Facebook
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Original ATC SM75 had no copper shorting either. It is an underhung motor with saturated magnetic field in the gap. Distortion is low from a dual suspension, and the impedance and response of the "copy" is actually rather similar to the SM75, I imagine it is a very well performing driver. In any case, I won't be purchasing this one or the SM75 as the price does not make sense to me.
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It would be Very distressing buying a pair and they were rubbish! It is not cheap and with Australian customs ability to destroy your goods and not be liable probably too risky for me - happened to several people I know personally 🙁
However if the company had them tested independently that might make them worth trying
However if the company had them tested independently that might make them worth trying
Original ATC SM75 is so old now whatever patent was on it has expired many moons ago. Many people can "reverse engineer" anything, or what's that saying... standing on the shoulder of giants?
I'm sure it a good driver but nothing groundbreaking.
What both the ATC and Purifi, Scan-Speak etc have shown is that paying attention to the soft parts eg. suspension, spider, surround, cone are all very important terms of distortion producing mechanisms. I recall Tang Band can some kind of spider-less dual cone driver called RBM, IIRC @Maynardg tested to be the lowest distortion 8" he'd ever measured.
Sadly it's not longer available to DIYers, only OEM...
Hopefully with more FEA into the future drivers will get longer stroke and lower distortion.
You have to pay for the privilege, and wait 20 years if you want some kind of cheaper clone...
I'm sure it a good driver but nothing groundbreaking.
What both the ATC and Purifi, Scan-Speak etc have shown is that paying attention to the soft parts eg. suspension, spider, surround, cone are all very important terms of distortion producing mechanisms. I recall Tang Band can some kind of spider-less dual cone driver called RBM, IIRC @Maynardg tested to be the lowest distortion 8" he'd ever measured.
Sadly it's not longer available to DIYers, only OEM...
Hopefully with more FEA into the future drivers will get longer stroke and lower distortion.
You have to pay for the privilege, and wait 20 years if you want some kind of cheaper clone...