HI -VI RT2 PRO max capacitor employable in series

[inertial]

hi,
I wanted ask to HI-VI,
but not possible contact they,
so I ask to someone expert in isodinamycs ,
which is the maximum value for in series cap to put in to measure the frequency response with 2,83 volt,
because the datasheet seems to me unrealistic( perhaps half-space)

thanks for help

cheers

[wolf_teeth]

Originally Posted by inertial

hi,
I wanted ask to HI-VI,
but not possible contact they,
so I ask to someone expert in isodinamycs ,
which is the maximum value for in series cap to put in to measure the frequency response with 2,83 volt,
because the datasheet seems to me unrealistic( perhaps half-space)

thanks for help

cheers

This driver is not a true-ribbon, so a capacitor is not absolutely mandatory to save your amplifier, but a 25uF would not be out of the question to measure the response.

Later,
Wolf

[inertial]

OH, very thanks,
25 microfarad seems good to see something good

cheers

[Phenoholic Anonymus]

Hi,

I have a pair of these too.(did not measure them) It was tested some years ago in the German Magazine Hobby Hifi. The graph in this doc is from the Hobby Hifi test. That should be a precise measurement. Please notice Hi-Vi stopped producing this +-100dB planar. So If you plan a new speaker with it, that might become a problem.

[inertial]

very thanks, precious graph.

No, isn't for future NEM speaker , just for have a fun with a friend of mine !

cheers

[inertial]

FORGOT :
should be interesting to know if half space or in minimal box mounted
and how mutch big was the in series cap employed for testing

[Phenoholic Anonymus]

Ok, Enjoy! Hobby Hifi magazine used this planar in their referenence (hate that word MkIII) speaker Optimum. Some hornpeople may be interested in this tweeter Only other planar +- 100 dB option is this one: http://www.expolinear.de/images/stor...rt-8%20pro.pdf

[wolf_teeth]

Originally Posted by Phenoholic Anonymus

Please notice Hi-Vi stopped producing this +-100dB planar. So If you plan a new speaker with it, that might become a problem.

Please note it is still on their website:
Overview of RT2-Pro Drivers_HiVi,Inc

It is still available for sale from 1 vendor in North America; Solen.

Later,
Wolf

[Phenoholic Anonymus]

Thanks Wolf, i do hope Expolinear will keep selling the RT7 pro as they call it...

On the subject, this magnetostatic tweeter does not need a cap to be measured. (or just as much as any tweeter needs a cap). It's impedance is almost a flat 8 Ohm.

[wolf_teeth]

I said it's not a true ribbon, so it's impedance does not dip and won't hurt an amplifier.
Did you miss that?

BUT- unless you want to blow the tweeter when doing a sweep, a 25-40uF cap is advised. It's for the tweeter, not for the amp. You can't play bass through a ribbon or planar and have it survive very often.

Later,
Wolf