Best kit with Seas T25

[Ben]

I have a pair of Seas T25-001 sitting in the cupboard, and wish to make a smallish speaker with them (no 70 liter floor stander designs please), and wondered what is the best kit plan available at the moment using this tweeter. I prefer sealed enclosures, or open-baffle design, although due to financial constraints doubt i will be able to stretch to the cost of four hi-end woofers. I intend to use the speakers with a passive cross-over driven from a standard high-output transistor amp, so sensitivity is not a concern. Willing to pay $200 per woofer for a two-way design.

Thanks for your thoughts,

Ben

[JRT]

>I have a pair of Seas T25-001 sitting in the cupboard, and
>wish to make a smallish speaker with them (no 70 liter floor
>stander designs please), and wondered what is the best kit
>plan available at the moment using this tweeter. I prefer
>sealed enclosures, or open-baffle design, although due to
>financial constraints doubt i will be able to stretch to the
>cost of four hi-end woofers. I intend to use the speakers with
>a passive cross-over driven from a standard high-output
>transistor amp, so sensitivity is not a concern. Willing to
>pay $200 per woofer for a two-way design.
>
>Thanks for your thoughts,
>
>Ben

Phil Bamberg does good work.
http://www.bambergaudio.com/

Phil developed a new 2.5 way TMM loudspeaker using a Seas Excel E0006-06 T25CF001 tweeter in combination with a pair of Seas H1456-08 ER18RNX woofers. The ER18 lacks the copper phase plug ued in most of the Excel line of woofers, but has a comparable motor (copper Farraday ring and a tee shaped pole piece), better than what is normally used in the Prestige line. He is redesigning it because the tweeter is now (supposedly) out of production.

You could build that with a sealed alignment. Phil designed it with an EBS (extended bass shelf) using rear firing PRs instead of ports. The woofer tuning is well below the TMM crossover frequencies, so changing it to sealed and crossing to a subwoofer would not affect the TMM crossover tuning, as long as you do not change the system's overall spectral balance. If you make the bass overly thin, that would affect the perception of balance against the high frequency content, which could make the speaker sound too bright. So if you convert a well designed bass reflex to sealed, you should add a subwoofer, IMO.

Anyway... I suggest that you contact him.

http://www.audiocircle.com/circles/index.php?topic=46182.msg413955