New Member from somewhere on the east coast! :)

Greetings!

First serious listening as teenager: my brother's Phase Linear/Klipsch Cornwall system in our basement
Years later: Luxman R1070/Magnepan SMGa
Then Scott 222D (Mapleshade modded)/Dynaudio 42

Current amps:
Kenwood Model 500 (refreshed by Echowars)
Heathkit AA-151 (modified by Sam's Audio Lab)
Sony TC-500a (refreshed)

Current Speakers:
Kef 104/2
Bozak 302 Century (Tobin crossover)
Altec Bolero 890C

Current goal: Build best speaker possible using Altec 601C & MR931-12 (for use with subwoofers handling low frequencies)

Very open to feedback/suggestions :-)

Cheers!
Jeff
 
Thanks a lot for all the welcomes! I appreciate it. When I lie down on the pillow at night, oftentimes, I fall asleep visualizing how to get all my Altec/Bozak/EV/Janszen drivers into various configurations and test to see how they'd sound. I keep trying to think of some way to create an easily adjustable loudspeaker test cabinet - one in which cu/ft, driver size openings, port size, crossover, etc. could be changed quickly to enable effiecient experimentation. I've looked around on various sites for discussion around this idea but have not really found anything. To me, this would be worth a million bucks! Guess I just need to keep thinking.

My most recent thought was to incorporate the Altec 601C in the Bolero 890C... maintaing the robust bass (via 406Y & passive radiator) with addition of the 414 midrange and 3000 tweeter. Man oh man. I think I'm ill. :)
 
Thanks a lot for all the welcomes! I appreciate it. When I lie down on the pillow at night, oftentimes, I fall asleep visualizing how to get all my Altec/Bozak/EV/Janszen drivers into various configurations and test to see how they'd sound. I keep trying to think of some way to create an easily adjustable loudspeaker test cabinet - one in which cu/ft, driver size openings, port size, crossover, etc. could be changed quickly to enable effiecient experimentation. I've looked around on various sites for discussion around this idea but have not really found anything. To me, this would be worth a million bucks! Guess I just need to keep thinking.

My most recent thought was to incorporate the Altec 601C in the Bolero 890C... maintaing the robust bass (via 406Y & passive radiator) with addition of the 414 midrange and 3000 tweeter. Man oh man. I think I'm ill. :)

Here's the best I've got for you on the "Transformer test cab": you build a nice big refrigerator cabinet that in regular mode is as big as you can imagine you'd want to go, lets say it's 9 cu ft. in it's regular mode. Front baffle is removable of course, set up for a maximum diameter of 12" or 15" or whatever if you think your going to go that big. Then you've got inserts to adapt smaller woofers into. That parts easy!

Similar for the port, cut out a nice big one then I'm imagining a sliding bit that's you can use to cover the port at variable distances to adjust for different tuning.

To adjust the volume of the cabinet you've got an interior false top. The interior top has a dovetail on either side and there are cleats spaced on the sides of the interior of the cabinet that it can slot into, to drop the cu ft. to say 7,6,5, or whatever. That keeps it pretty rigid while giving you customization. I have an antique bookshelf that lets you adjust the shelf spacing this way. I guess you just stuff some insulation into the cavity above the false top to take it out of the equation. If your false top gets lower than your woofer opening on your baffle you flip the baffle and speaker upside down and the top becomes the bottom.

Crossover customization just requires a good stockpile of components in different values and some alligator clips to link it all together 😁

Let me know how it all works out 😜
 
That's a lot of food for thought. Thank you! I've read your post attentively, twice. I'm sure I'll refer back to it again and again as I continue to think through this.

What is your plan for the 414?

Kind regards!
 
That's a lot of food for thought. Thank you! I've read your post attentively, twice. I'm sure I'll refer back to it again and again as I continue to think through this.

What is your plan for the 414?

Kind regards!

No problem! For the record I've never tried any of that stuff but I think it would work 😁

414s are getting bass reflex cabinets (in fact, I received the plywood for them today and will be building tomorrow!) and paired with 802g compression drivers mounted on 3D printed horns. I've got a rough draft of the crossover network already since I've been running the horns with my Boleros, will just need to fine tune to match the relative efficiency & crossover point!
 
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