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Old 7th March 2014, 08:18 PM   #1
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Default 70khz tweeters and 10" vifa drivers

Hello folks, been using this site for ages and finally have a question to ask that is a little beyond me...

Firstly, I have the most unusual set of ovoid/egg speakers. they are huge and if i can work out how to post a pic i will, I have no information on them as there is literally nothing online...70s,80,90s who knows. They have 10" and 4" vifa drivers with 90mm vifa tweeters

Secondly, i am about to put some 70hzt tweeters in them from the Sony SSB2ED so i can enjoy SACD and HDMI Master Audio etc from the PC... right pain in the bum to fit but hopefully not beyond me. My question is do i need to swap crossovers as the range goes way beyond the 20khz range of standard tweeters. I would have thought the crossover would not restrict anything above 20Hkz but i am keen to learn.

Also the 10" drivers dont match, ones has a bigger magnet and a concave dust cover the other err... has the opposite. they sound amazing but looks wise i would like the drivers to match, sound wise there is no difference... I have been mooching round ebay for months and seas/ vifa drivers cost too much, is there a cheaper alternative especially as i have a very good sub, can i get away with cheap 10" drivers and let the exeptional tweeters and 4" mids do the singing and my sub to do the booming just to take up the slack of cheaper bass drivers...

now to try and upload some pics...

I managed it i think... some of the pics are from before they were resprayed so the look a bit better now...
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Old 7th March 2014, 08:25 PM   #2
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Your assumption is correct, there is not top cut off with the crossover. Why have tweeters at 70KHz? Human ears at best cut off at 18KHz.
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Old 7th March 2014, 08:38 PM   #3
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There is a deffinate resonance around the room from 70khz when a piano is playing you can hear the air hitting the side of the piano etc, its more of a sensation than a sound. blew me away when i first heard the difference. a bit like a sixth sense... the sound changes as its bounced round the room if you know what i mean. There really is a genuine difference...a clap in an anachoic chamber will sound different to one outside.
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Old 7th March 2014, 08:43 PM   #4
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P.s. many thanks for confirming about the crossovers, makes a job fitting 95mm tweeters into a 90mm hole a bit less complex... some real choping involved there as my original face plates have 3 screws and a 3/4 inch hole, and no cut out for the dust cover protector mesh on relacement tweeters
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Old 7th March 2014, 09:10 PM   #5
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Old 7th March 2014, 09:32 PM   #6
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In the last couple of weeks while waiting for my speakers to be resprayed i have had 50khz speakers, 70khz speakers and two sets of 20khz speakers wired up and there is a difference, it depends on the audio played but if a cd only punts out 44-48Khz and a hdmi amp via a well set up PC can punt 192khz then that is a difference. That is nearly 4 x the difference so i guess by the time its bounced around the room 20,000 times a second it has time to evolve before vibrating the hairs in your inner ear. I had my ears tested two years ago and i have very good hearing indeed, Even my non music loving neighbour asked if had bought a new amp as the speakers looked the same... just wish i could afford decent 10" drivers... bass can only be "felt" below 20 odd hz...
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Old 7th March 2014, 09:37 PM   #7
sreten is offline sreten  United Kingdom
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Hi,

Quite frankly the crossover looks pretty poor for a 3 way.

Swapping tweeters may help as one is clearly very damaged.

rgds, sreten.
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Old 7th March 2014, 09:50 PM   #8
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I was told by a specialist that simple is good when is comes to crossovers, The pics are old from when i first bought them. They have been profesionaly resprayed and the tweeters replaced with bog standard mission ones and i replaced the dust caps on the midranges . just got the woofers to replace now... money, money, money... any advice on crossovers is welcome but they really do sound good apart from the 20htz mission tweeters get a bit shrill when really giving it the berries, oddly 70khs sorted it completely... I must also add ovoid/ egg shape speakers really are a good shape to give a good sound, plenty of litres for less space...
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Old 7th March 2014, 10:23 PM   #9
Illusus is offline Illusus  Canada
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oops.
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Last edited by Illusus; 7th March 2014 at 10:28 PM.
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Old 7th March 2014, 10:27 PM   #10
Illusus is offline Illusus  Canada
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Crossover complexity is not the only issue, its component quality is another. The components in the pictured crossovers are bottom of the barrel. Interesting enclosures though, I'd turn them into a two way.
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