Dynavox paper cone (phenolic ring) tweeters

[freddi]

should have some use in multi-way and some "helper" tweeter applications

 

[system7]

I'm not getting your point here, freddi!

4.25" Round 10 oz 8 ohm 3/4" V Phenolic Ring Tweeter

It's the modern Acoustic Research cone tweeter replacement, isn't it? You can get it at Madisound and Parts Express too. The Monacor HT22-8 is not dissimilar.

 

[freddi]

in the US they are imported under the Dynavox name - I'm not sure how to use the 10oz magnet model as it appears to have a bump on the bottom and even with 1uF highpass, wants to corner around 3K - how does one successfully use one with a high crossover?

4.25" Round 10 oz 8 ohm 3/4" V Phenolic Ring Tweeter

http://www.dynavox.com/4.25inch-Round-6-oz-8-ohm-20mm-VC-Phenolic-Ring-Tweeter

I had a pair of AR4x when they came out

 

[freddi]

here's the impedance for the two Dynavox - what might I try for a highpass?

 

[TMM]

in the US they are imported under the Dynavox name - I'm not sure how to use the 10oz magnet model as it appears to have a bump on the bottom and even with 1uF highpass, wants to corner around 3K - how does one successfully use one with a high crossover?

With one of these bad boys:
mh-audio.nl/RLC_Series_Resonant_Calculator

If the mechanical Q causes a peak in the unfiltered response, aim for the RLC filter to make the overall impedance dip slightly around the driver resonance - this will give you a slight dip in the transfer function and flatten the freq response.

 

[freddi]

thank you very much - here's what I see with 0.55mH and either 2uF or 3.3uF

 

[system7]

Those are all 3kHz second order crossovers. Quite reasonable with 8" bass. I do stuff like that myself. You can also do 4uF/0.2mH/6uF or thereabouts for third order.

Acoustic research usually used to cross a bit lower. 5uF or 6uf single cap and 15R attenuator.

 

[freddi]

here's what I had for onhand for a RCL filter and 3.3uF 1/24th octave with the 10oz magnet Dynavox - that would add about $10 to the cost with an Erse 20ga coil - I'm out of alligator clips and forgot to graph it with a shunt inductor -

here's the 10oz magnet Dynavox vs Parts Express version with just capacitor highpass - the Parts Express
part really goes low - not sure how clean