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Multi-Way Conventional loudspeakers with crossovers

HI -VI RT2 PRO max capacitor employable in series
HI -VI RT2 PRO max capacitor employable in series
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Old 22nd February 2014, 09:44 AM   #1
inertial is offline inertial  Italy
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Default HI -VI RT2 PRO max capacitor employable in series

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
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Old 23rd February 2014, 07:25 AM   #2
wolf_teeth is offline wolf_teeth  United States
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Quote:
Originally Posted by inertial View Post
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
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Old 23rd February 2014, 10:44 AM   #3
inertial is offline inertial  Italy
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OH, very thanks,
25 microfarad seems good to see something good

cheers
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Old 23rd February 2014, 05:02 PM   #4
Phenoholic Anonymus is offline Phenoholic Anonymus
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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.

Last edited by Phenoholic Anonymus; 23rd February 2014 at 05:05 PM.
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Old 23rd February 2014, 05:08 PM   #5
inertial is offline inertial  Italy
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very thanks, precious graph.

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

cheers
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Old 23rd February 2014, 05:11 PM   #6
inertial is offline inertial  Italy
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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
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Old 23rd February 2014, 05:15 PM   #7
Phenoholic Anonymus is offline Phenoholic Anonymus
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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

Click the image to open in full size.

Last edited by Phenoholic Anonymus; 23rd February 2014 at 05:20 PM.
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Old 23rd February 2014, 08:39 PM   #8
wolf_teeth is offline wolf_teeth  United States
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Quote:
Originally Posted by Phenoholic Anonymus View Post
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
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Old 23rd February 2014, 09:24 PM   #9
Phenoholic Anonymus is offline Phenoholic Anonymus
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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.
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Old 23rd February 2014, 10:13 PM   #10
wolf_teeth is offline wolf_teeth  United States
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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
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