Then make your calculations with X-Max/10 and you will get the same ranking overall.
yep a 25w diy nelson class A amp is quite good ,i'm using only 10w vfet incredible loud
the industry is fooling us to the bonez ... I remember some years ago I encountered the old OEM webpage of this dome driver saying single unit price is $11 - !!!
https://www.indiamart.com/proddetail/raw-drivers-3-inch-dome-midrange-9433850291.html
Can't remember exactly all details but it has low freq res good xmax flat response no ferrofluid ... and looks very similar to the dome driver in the studio monitors that Neumann uses!
https://www.indiamart.com/proddetail/raw-drivers-3-inch-dome-midrange-9433850291.html
Can't remember exactly all details but it has low freq res good xmax flat response no ferrofluid ... and looks very similar to the dome driver in the studio monitors that Neumann uses!
...and it sounds good too! I heard it in a little 3-way with a Dayton DS woofer and the little Dayton ribbon, and I must say midrange was excellent.
Wolf
Wolf
Are you struggling over the moderate prices for the Peerless GBS-85N (Paper membrane) ? Some years ago some similar looking one from Peerless for $11 at indiamart (still being offered there, but without price tag)? And today the genuine one for $18.46 at parts express? Nota bene: If you go for the even bigger sibling GBS-115N (Al membrane), then you will pay $31.55 at parts express. This one could indeed be a really nice, big dome midrange, by the way ...
What is the problem then? I don't feel fooled to the bonez at all by this offer, aka by this very moderate price increase when ordering from a 1st grade supplier. Or do you want to blame Neumann? If so, for what then? For the assumed use of a 20$ midrange within a top product? What would be wrong whith that if you were right with your assumption? If the driver nicely fits the tech needs? A Neumann speaker might be just a little bit more than the raw stack of hardware, and that is what you pay for. Or do I get something wrong?
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Member
Joined 2003
FWIW That Tymphany GBS is not a dome midrange in the traditional sense, where the voice coil is terminated at the dome edge, so a 3" dome = 3" VC. This GBS driver is more of a traditional cone driver, that happens to be dome shaped. The voice coil is 1" with a spider suspension just like a "normal" cone driver.
The GBS tested with rather high 2nd order distortion, but it is a low cost driver, interesting anyway for low cost 3-way designs.
https://audioxpress.com/article/test-bench-tymphany-gbs-135f25al02-04-5-25-inch-woofer
The GBS tested with rather high 2nd order distortion, but it is a low cost driver, interesting anyway for low cost 3-way designs.
https://audioxpress.com/article/test-bench-tymphany-gbs-135f25al02-04-5-25-inch-woofer
It's like a conical driver, except the fact that the spider works in reverse. The center is fixed and the edge moves.
Thank you for precisions about the construction and for the mercyless audioxpress link. I was not aware that it had been tested before.
So, no dome. It's domed instead. And it's doomed: At least now for me, after having seen the rarely seen lousy distortion figures. I like midranges to have sub-0.5% thd figures @ 90dB, which cruelly narrows the choice on this vast marketplace.
So, no dome. It's domed instead. And it's doomed: At least now for me, after having seen the rarely seen lousy distortion figures. I like midranges to have sub-0.5% thd figures @ 90dB, which cruelly narrows the choice on this vast marketplace.
This transducer is just very bad design. Suspension does not stabilize dome and coil because everything is in one plain. I've even seen a woofers on speed camera that where rocking from side to side on bigger excursion. This is bigger problem than it seems as coil will rub against the sides of the gap. I'm not even precisely sure how it affects magnetic field in the gap.
Member
Joined 2003
I'm sure the assymetry of a spider suspension on one side and half roll rubber on the other doesn't help. It's designed to give you that tube warmth without needing the expensive tube amp 😉
I wonder if the trick SB does on their tweeters could scale. Edge driven and the center stabilizing post. Maybe not for the excursion for a 3, but a 2?
Teeter-totter and bell mode are two well known problems. It does not take much to excite either.
Teeter-totter and bell mode are two well known problems. It does not take much to excite either.
Member
Joined 2003
The problem there is still one of asymmetry. With the dimple or ring radiator style, the outside surround is of different size/shape to the inside dome that is now also acting as suspension if it is anchored in the middle. And it has been shown with ring radiators and the dimple, have higher 2nd order distortion at low frequencies.
Some type of ring radiator like what is in that wacky HiVi 3 way coaxial driver might make sense, but then the problem is a lack of surface area and movement of half roll surround is not very piston like, perhaps M roll of corrugated would be better.
Some type of ring radiator like what is in that wacky HiVi 3 way coaxial driver might make sense, but then the problem is a lack of surface area and movement of half roll surround is not very piston like, perhaps M roll of corrugated would be better.
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I wonder if the Satori MD60 might be transformed by a meta-material absorption array (as in the KEF LS50 Meta) replacing the transmission line back piece. It appears to me that the only real drawback for it is rather high odd order HD which the array might reduce. Not sure I want to spend $173 to try the experiment, though. Perhaps I could first try adding such an array to the HiVi DMB-A as a proof of concept.
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Joined 2003
If it were easy, everyone would be doing it. It looks to me like that inner spider may be difficult to get glued in place, unless it’s attached to the middle ring first, then the middle ring attached. Hard to do properly when magnetized. They use double spiders with high excursion woofers too, making a recone more difficult than with a standard one. You just try not to need to.
Have a read about rolling shutter. It's not a driver problem but a problem related to recording video.