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ARCHIVED FORUM -- April 2007 to March 2012
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This is the first Archived Forum which was active between 17th April 2007 and 1st March February 2012

 

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Page 1 of 1 (9 items)
  • Re: Penta questions...

    Latest... Tested every coil for impedance. No open circuits - good news! Interestingly the coils all come in at 2.9-3.0 Ohms for the Penta 1's, 3.1-3.2 for the Penta 2's. Possibly an age thing. Ordering foam rings now.
    Posted to The Workbench (Forum) by GTS on 02-29-2012
  • Re: Penta questions...

    [quote user="Leslie"] Could you colo(u)r up your story a bit by adding some pictures. You know the frase "a picture is worth a thousand words". I'm specially interested in the shimming part of your Penta midrange, cutting of the dustcap, shimming, replace a new one etc. [/quote] (Nice pickup on the English spelling!) Pics? Sure
    Posted to The Workbench (Forum) by GTS on 02-28-2012
  • Re: Penta questions...

    Finally cleaned up 16 midrange drivers. Cleaned the original foams off the Penta 2's and finished cleaning a poor refoam off the Penta 1's. Some observations... Big difference between between cleanup of the original job and the poorly-done refoamed drivers - the latter took three times as long and, quite frankly, are a bit worse for wear. I
    Posted to The Workbench (Forum) by GTS on 02-27-2012
  • Re: Penta questions...

    All valid points Jeff - a great response. I agree that Fs as a lower frequency limit isn't a primary concern, though as a physical property it affects a great deal. The notion of valid end termination gives further ammunition to the previous question though - loading a cone up with glue at the periphery will have a more significant effect than the
    Posted to The Workbench (Forum) by GTS on 02-27-2012
  • Re: Penta questions...

    Still scraping and dissolving glue on the frames of the Penta 1 midrange (the 'professional' refoam)... what a mess. The baskets are glass-filled nylon and end up looking a little worse for wear... until a surface color's applied, then we're getting somewhere - cosmetically original and a nice, flat surface to glue onto. Quick question
    Posted to The Workbench (Forum) by GTS on 02-27-2012
  • Re: Penta questions...

    [quote user="Leslie"] Foam. Have been using rubber before but it's quite difficult to handle! [/quote] Would imagine this changes the T/S parameters also, starting with Fs - probably not ideal.
    Posted to The Workbench (Forum) by GTS on 02-26-2012
  • Re: Penta questions...

    OK! Four Penta's worth of midrange drivers (that's 16 of them!) removed, old foams out of my Penta 2's and 'new, professionally refoamed' kit off my Penta 1's... what a disaster! I had thought some of the horror stories on refoaming on this forum to be a bit extreme, but no - completely possible! What a sad way to treat a lovely
    Posted to The Workbench (Forum) by GTS on 02-26-2012
  • Re: Penta questions...

    I should be honest - I bought my other Pentas at extremely good prices and didn't do too badly on these. Whilst the seller didn't take them back, he was good enough to offer a partial refund. So I have two 'good' pairs (1x Penta 2, 1x Penta 3) requiring slight refurbushing and one 'not so good' pair (1x Penta 1) for whom I've
    Posted to The Workbench (Forum) by GTS on 02-25-2012
  • Penta questions...

    So; After looking for a second set of Pentas, I negotiated (what I thought was) a fair price with an eBay seller and a pair of Penta 1's arrived recently. Regrettably the midrange drivers weren't so much "professionally refoamed" as promised, more "refoamed by a blind man using too much glue"... visually the job is horrific
    Posted to The Workbench (Forum) by GTS on 02-25-2012
Page 1 of 1 (9 items)