I'd like to build a pair of 2-way speakers using Decca London ribbon tweeters and 8" Audax hd20b25h-c12 woofers.
The crossover (attached here) is at 1500 Hz and used before in speakers using these tweeters.
This is the first time I will attempt to build speaker cabinets, so I appreciate any fundamental tips/ideas.
What program can I use to estimate an appropriate sealed box volume, or can I simply refer to the volume of brand speakers that use this woofer? I have the Thiele parameters.
Also, are there significant differences if the horn tweeter is placed inside the cabinet, or mounted freely on top? That way I only have to worry about building the box around the woofer.
The crossover (attached here) is at 1500 Hz and used before in speakers using these tweeters.
This is the first time I will attempt to build speaker cabinets, so I appreciate any fundamental tips/ideas.
What program can I use to estimate an appropriate sealed box volume, or can I simply refer to the volume of brand speakers that use this woofer? I have the Thiele parameters.
Also, are there significant differences if the horn tweeter is placed inside the cabinet, or mounted freely on top? That way I only have to worry about building the box around the woofer.
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In the late ‘70s i got a chance to go to town on a set od Decca prototypes with the Decca London (one of my favorite tweeters all-time), with 8” paper cone woofers. We treated the drivers, rewired, and braced the enclosure. In the day — driven by NAIM 160 w Linn TT — one of the most enjoyable speakers i had heard. XO was at 1000 Hz, no memory of the XO configuration except that it was 2nd order i think.
The hi-pass in your network is one commonly used, i have it from another source.
dave
The hi-pass in your network is one commonly used, i have it from another source.
dave
The (new) driver should then be measured for T/L specs and maybe frd/zma also. But for the box the first is more important than the second that would be similar in behavior (not).
The original box is strange but some kind of MLTL maybe, who knows? Of course, with parameters you can design any BR.
This link has something not uncommon:
The Subwoofer DIY Page - Projects : Proof of Concept #6
The original box is strange but some kind of MLTL maybe, who knows? Of course, with parameters you can design any BR.
This link has something not uncommon:
The Subwoofer DIY Page - Projects : Proof of Concept #6
Or this one with a Dayton DCS205 8" subwoofer driver instead.
The Subwoofer DIY Page v1.1 - Projects : The Boom Unit
The Subwoofer DIY Page v1.1 - Projects : The Boom Unit
Hello again,
The original driver Audax HD20B25H2CP12 was good for a quarter wave type of box or similar vented box as the original.
If you speak French you can use the help of Petoin Dominique.fr software/website.
The tweeter with horn likely will need to be padded from the woofer much lower approx. 87 dB (Audax).
With new data for the drivers modified/upgraded (likely different surrounds from the original, unless they are identical) you and us can estimate much better an adequate box size and type instead of guessing work.
The original driver Audax HD20B25H2CP12 was good for a quarter wave type of box or similar vented box as the original.
If you speak French you can use the help of Petoin Dominique.fr software/website.
The tweeter with horn likely will need to be padded from the woofer much lower approx. 87 dB (Audax).
With new data for the drivers modified/upgraded (likely different surrounds from the original, unless they are identical) you and us can estimate much better an adequate box size and type instead of guessing work.
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