2 inch Peerless vs 2 inch HiVi Research

[planet10]

Originally posted by augerpro
I wonder if aperiodic vents would be helpful?

Yes... not for extension in a midrange, bit for sonics.

dave

[richie00boy]

Originally posted by planet10
In his study of small drivers Zaph concluded that none of the drivers smaller than 3" were really worthy of consideration. http://www.zaphaudio.com/smalltest/

Thanks, but I can't really see how you drew that conclusion. He hasn't even tested any 2 inch fullranges, only mid domes. Bear in mind I'm using it as a mid-tweeter, not a fullrange.

[planet10]

Originally posted by richie00boy


Thanks, but I can't really see how you drew that conclusion. He hasn't even tested any 2 inch fullranges, only mid domes. Bear in mind I'm using it as a mid-tweeter, not a fullrange.

I think he has changed things around *i just quickly found that link)... his original report had a number of 2" and none of them were as good up high as the best of the 3" he tested. And the 3" i mentioned is decidedly better than the best 3" he had done.

dave

[sreten]

Hi,

An obvious use of a 2" is Linkwitz's Pluto.

Zaph's dismissal of 2" drivers is in regards of full range, 3" is best IHO.

Once you add an extra driver or two you are talking mid/treble or treble only.

Reality always bites and whilst 3" drivers are punishingly inefficient,
full range 2" drivers are ludicrously inefficient. Discussing Qts of 2"
drivers is pretty pointless because used at any reasonable level
farfield they should be used well away from Fs.

BTW where in the UK is the A2S easily available ?

/sreten.

[lne937s]

If you need a 2" wide driver, I would look at the 2x3" from Tang band...

http://www.partsexpress.com/pe/showd...number=264-830

reasonable sensitivity for that size and fairly smooth response...

[planet10]

Originally posted by sreten
Reality always bites and whilst 3" drivers are punishingly inefficient,
full range 2" drivers are ludicrously inefficient. Discussing Qts of 2"
drivers is pretty pointless because used at any reasonable level
farfield they should be used well away from Fs.

The 3" Fostex are not so bad. The FF85K is 88dB, the FE83 and 87 a bit more. I chose the FF85 because i can make it work in a 2 litre box.

BTW where in the UK is the A2S easily available ?

Dyna A25? World Design has a remake of that classic.

dave

[richie00boy]

sreten, the A2s is available from IPL Acoustics. They don't list it on their sute but they do sell it.

I think I'm just going to get some and try. I think for what I want (not big SPL and probably 500Hz upwards) they will be ideal.

[sreten]

Originally posted by planet10


The 3" Fostex are not so bad. The FF85K is 88dB, the FE83 and 87 a
bit more. I chose the FF85 because i can make it work in a 2 litre box.

dave

Hi,

I don't they count as full range in Zaph's regimen due to pathetic Xmax.

I'd class them as mid/treble unless they are back horn loaded low down.

/sreten.

[planet10]

Originally posted by sreten
I don't they count as full range due to pathetic Xmax.

I'd class them as mid/treble unless they are back horn loaded low down.

We'll soon see how they do... µFonkens are being built. Really intended to be used as sats with a sub thou.

dave