What to build with these drivers?

[zdr]

Preliminary xover, any suggestions welcome:

 

[zdr]

Got an email from SEAS where they say 27TAF (H1397) tweeter is closer match to mine, so xover updated. Played a bit with serial ones.

 

[zdr]

or maybe something like this.

 

[zdr]

It seems that woofer is nowhere close to w12cy001 in terms of bass response, tried it in 5l vented box. Membrane material also looks totally different, maybe is something much cheaper than magnesium.

 

[zdr]

It seems that woofer is nowhere close to w12cy001 in terms of bass response, tried it in 5l vented box. Membrane material also looks totally different, maybe is something much cheaper than magnesium.

Scratch that, already much better after hour of burning in. Since they were used, I expected them to be burned in already. Apparently not the case.

 

[zdr]

Boxes coming along, first time veneering.

 

[seantkezm]

Wow, those look fantastic!
What did you decide upon with the crossover?

 

[zdr]

Wow, those look fantastic!
What did you decide upon with the crossover?

Thanks. Did not decide on crossover yet, this is the one currently in use.

 

[DickHertz]

Curious why you didn't offset the tweeter to better control diffraction? Beveling the cabinet sides helps, but a tweeter offset will help even more.

 

[system7]

Nice,

Did you see Eekel's Mini at Troels Gravesen's site, zdr?

Eekels' Mini

We don't seem to be a million miles away here. Reflex is indicated, presumably. But that needs a Qts around 0.38.

Offsetting drivers is a nice theoretical idea, DickHertz, but in practise, asymetric slopes work well enough too. Hence third order on tweeter, second order on bass. But, hey, I could be wrong. Time aligned is quite the rage these days... LOL

 

[zdr]

Curious why you didn't offset the tweeter to better control diffraction? Beveling the cabinet sides helps, but a tweeter offset will help even more.

Did some baffle simulations and did not see much difference when I was moving tweeter around.

 

[DickHertz]

Exactly what I would expect a competent designer to do.

Currently I'm running a Peerless 850122 woofer/XT25TG30 combo in a T/L stand mount cabinet. Really like the sound. The tweeter is fabulous. Looking forward to trying your design.

 

[zdr]

Nice,

Did you see Eekel's Mini at Troels Gravesen's site, zdr?

Eekels' Mini

We don't seem to be a million miles away here. Reflex is indicated, presumably. But that needs a Qts around 0.38.

Offsetting drivers is a nice theoretical idea, DickHertz, but in practise, asymetric slopes work well enough too. Hence third order on tweeter, second order on bass. But, hey, I could be wrong. Time aligned is quite the rage these days... LOL

I have seen these, yes. But the idea is to be original and to use the parts I already have at the same time. I also do not like to overdo a crossover.

 

[zdr]

For the cabinet damping, I used 3mm thick natural rubber sheets.

 

[zdr]

FR at 10 cm on axis.

 

[zdr]

Measured impedance and phase.

 

[zdr]

Had to decrease woofer coil value to 1.2mH, sounds better.

 

[zdr]

Woofer coil now at 1mH.

 

[zdr]

These babies starting to sing like a dream. Corrected impedance plot, easy and smooth load for amplifier. Not that RMI-FC100 could not handle a more difficult loads.

 

[zdr]

Final crossover: