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Author Topic: Dolby Labs 422?  (Read 8911 times)

Offline ironbut

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Dolby Labs 422?
« on: July 21, 2007, 11:07:42 PM »
Any of you guys had any experience with this unit? There was one on Ebay a few weeks ago and I was wondering if any of us bought it. I went for around $550 I think which seemed like a good price if working correctly. I still can't help but think that the purist approach with discrete components is the way to go.
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steve koto
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Offline beefman

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Re: Dolby Labs 422?
« Reply #1 on: August 27, 2007, 11:20:46 PM »
I bought one off Ebay quite some time ago. The 422 isn't bad but I prefer the older 330 unit. It seems less... 'hazy'. IMO I'd rather have NO Dolby at all. I simply don't like what it does to the sound. It's not transparent by any means.
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Offline rhopkins

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Re: Dolby Labs 422?
« Reply #2 on: August 31, 2007, 07:15:46 AM »
I have a Dolby 422 unit and a Dolby 330 but the 330 hasn't arrived yet so I haven't done a direct comparison on the two units. 

The thing with the Dolby 422 unit is that it was made for cassette and VHS tape duplication and it shipped with various filters installed depending on the application.  Roger Ginsley of Tekx Electronics did some bench testing of the unit for me a few weeks ago and created some print-outs of the frequency response with and without the cards installed.  The cassette filter rolls off the high frequency response at 16,000 and the VHS has a notch filter for video.  By pulling the filter cards you get a flat frequency response out to 22,000 and then it rolls off to 25,000.

The 422 is also a more complex unit and offers Dolby B, C and an optional S - not SR but a "new and improved" consumer format which was intended to replace Dolby B and C for cassettes. 

Once I get a chance to use both I'll post what I hear.

Rick
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