30 year old IMF Super Compact conversion

[activexp]

My 30 year old IMF Super Compacts were getting a bit tired so I replaced the woofers with Skytronic 8" kevlars, the mids with Hi-Vi B3N's and the tweeters with Skytronic silk dome units. For the crossover I made a simple 1st order 3-way at 750/6000Hz. Results were reasonable but not great.

I've now made some free standing 'pods' for housing the mids, tweeters and improved 2nd order crossover at 375/3000HZ (as per the original IMF's). The 'pods' sit on top of the IMF cabinets which have the openings for the original drivers blanked off so they are now just woofer enclosures. While I was at it, I replaced the Skytronic tweeter with a Hi-Vi RT1.3 ribbon.

Much better! but still work in progress.

I've done a write-up here:
http://sites.google.com/site/stevess...-supercompacts

[Inductor]

They don't look like the classics any more. Good job/work and documentation.

[activexp]

Originally posted by Inductor

They don't look like the classics any more.

IMF's for the 21st century?

[Inductor]

I was letting for other people to look before starting asking questions. My question, do you have any ringing from the Mid or are you fine, at the top xover band (the diagram for the xover must be posted also, I didn't read the site yet)? Do you get improved soundstage imaging (a better listenning position) from the alignment of the 3 speakers?

[PeteMcK]

"I had attenuated the woofer by 4db '...?

[activexp]

Originally posted by PeteMcK
"I had attenuated the woofer by 4db '...?

Thought it was the right thing to do at the time, matching the quoted sensitivity/SPL of the B3N - 81dB. As a novice in DIY speaker building I'm still learning, mostly by trial and error.

[activexp]

Originally posted by Inductor
I was letting for other people to look before starting asking questions. My question, do you have any ringing from the Mid or are you fine, at the top xover band (the diagram for the xover must be posted also, I didn't read the site yet)? Do you get improved soundstage imaging (a better listenning position) from the alignment of the 3 speakers?

Mid is perhaps a little forward but acceptable to my ageing ears.

For the XO I used a calculator here:
http://www.diyaudioandvideo.com/Calculator/APCXOver/

Imaging is much improved over the original IMF's