Some speaker driver measurements...

Jump to Latest
#2,103
I'm with you on this,

Here's some 6.5 " drivers I have experience with

3Khz @ 45 degrees

Scan 18W/8545: -9dB
Vifa NE180W: -8dB
SBA SB17NAC/NBAC/CAC - 7dB
Purifi 6.5X - 6dB

In fact, every time I look at a 3" dome- it doesn't even always outperform a 4-5" cone in terms of dispersion.

One of my favourite mids is only -1.5dB down
1660880013725.png


Reference:
https://hificompass.com/speakers/measurements/vifa/vifa-ne123w-08
 
Last edited:
  • Like
Reactions: Eric J, Mainframe, vineethkumar01 and 1 other person
#2,106
I would take the Tang Band over the Satori based on VC's measured performance, for any application other than pure filler driver. IIRC someone on another forum got a quote from Tangband directly, but the shipping was expensive. They did also say that PE would carry it, IIRC.
 
#2,108
I am sceptical about Ferrofluid usage , you can never know how much is on the inside/outside of the coil! And in normal mounting position it follows the gravity so again an uncertainy ... Ferrofluid is a bitch 🙂

She dries over time or just vaporize , sometimes hardens maybe chemically not stable or contact with some metal surfaces are doing also no good to her 🙂

In most cases the inside volume of the magnet system is not properly vented for FF application . (also quasi-static air pressure is changing over time)

Btw - dust protection for fabric domes : A very thin coating with optical transparent silicone seems possible and cleaning the dome after years should be much easier with a few drops of mild soap solution and a very soft brush .

For mechanical protection we have here in germany a fine mesh made of copper ... it can be cut using a household scissor than formed into any shape by hand and it will hold it's shape well , for sourcing look for "coppergarden" ... it seems to be a copper-alloy that hold it's shiny appearance over time ... of course it is better to paint it to give some extra protection against corrosion!
 
  • Like
Reactions: morbo
#2,118
morbo said:
I just read the review, not the most useful one I've seen in VC. Distortion measurements only taken down to 1khz for a midrange? 🤔

It does show the same hump in H3 ~1.1khz that Hificompass measured, so I'd bet the H5 hump is still there as well. The impedance peak is sharp and even higher than the 'sample b' hificompass measured, maybe ~490hz or something. A ways off from the 'new' datasheet value of 400hz.
Click to expand...
I suspect that problematic area in FR is likely due to the TL back chamber length. The straight profile seen from the outside likely doesn't give it much taper inside, otherwise there wouldn't be enough net rear chamber volume and would raise Fs too much. The THD bump in the 1k area corresponds to that peaking FR, which tells me it's a resonance and internal reflection being the most likely cause. The other issue I have with that rear chamber is how the outside parameter looks like it shrouds part of the dome backside. If you look at the impedance curve, you can see a slight double hump peak, usually indicating an internal airflow resistance across the VC gap or poor dampening of the secondary VC gap air volume. It would be a nice mid if it didn't have that nasty bump in 3rd order HD around 1k or the weird LF rolloff slope, making it hard to cross lower.
 
  • Like
Reactions: morbo
You must log in or register to reply here.
Top Bottom