Penta questions...

in The Workbench · Feb 29, 2012 10:19 GMT

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.

Penta questions...

in The Workbench · Feb 28, 2012 12:46 GMT

[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, cuttin…

Penta questions...

in The Workbench · Feb 27, 2012 23:06 GMT

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 …

Penta questions...

in The Workbench · Feb 27, 2012 13:42 GMT

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 ammun…

Penta questions...

in The Workbench · Feb 27, 2012 04:43 GMT

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'…

Penta questions...

in The Workbench · Feb 26, 2012 17:48 GMT

[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.

Penta questions...

in The Workbench · Feb 26, 2012 12:15 GMT

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 …

Penta questions...

in The Workbench · Feb 25, 2012 11:07 GMT

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 (…

Penta questions...

in The Workbench · Feb 25, 2012 02:28 GMT

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 …