Mini Karlsonator (0.53X) with Dual TC9FDs

[xrk971]

Don't get too caught up in the exactness of the scaling. Get close with 3mm is fine. Some of those dimensions don't match because I probably rounded off to a convenient dimension.

 

[perceval]

Alright then!

Here's a 0.37x scale from the 0.40x drawing. Please forgive that I simply just pasted the numbers over the existing ones... and, I only used internal measurements.

Will be building this one sometime over the weekend, if I have time.

Cheers!

 

[plund]

I had a request to see how well an Alpair 10.2 would work in a Karlsonator. Based on the size and optimizing for a smooth response, a 7/15x or 0.47x scale works well. Looks like it could be a great sounding speaker - just watch the cone excursion below 60 Hz.


X, If you are able to take a pause from your amplifier endeavors... What are your thoughts on this .47 scale alignment loaded with an alpair 10.3 instead of the 10.2? Relatively, the 10.3 has a slightly lower QTS (.316) and also a bit less xmax.

Thanks,
Pete

 

[xrk971]

I had a request to see how well an Alpair 10.2 would work in a Karlsonator. Based on the size and optimizing for a smooth response, a 7/15x or 0.47x scale works well. Looks like it could be a great sounding speaker - just watch the cone excursion below 60 Hz.


X, If you are able to take a pause from your amplifier endeavors... What are your thoughts on this .47 scale alignment loaded with an alpair 10.3 instead of the 10.2? Relatively, the 10.3 has a slightly lower QTS (.316) and also a bit less xmax.

Thanks,
Pete

I am on travel at present and do not have my computer with Akabak with me. I will look at it when I get back next week. My guess is that a lower Qts driver will have less bass reach.

 

[xrk971]

Alright then!

Here's a 0.37x scale from the 0.40x drawing. Please forgive that I simply just pasted the numbers over the existing ones... and, I only used internal measurements.

Will be building this one sometime over the weekend, if I have time.

Cheers!

Looks good. When will you build it up again?

 

[perceval]

I just did. Didn't have time to measure anything yet.

But the AHE driver I put in there were workhorses, and I think I may have pushed them a bit much over time... right now, they can't take anything more than 15w before rattling noises from the cone come up.

I might have to swap the driver for something else.

PS... traveling in Asia again?

 

[xrk971]

PS... traveling in Asia again?

No, in Netherlands this time. 🙂

So before the rattling occurs, does it sound ok? 15w is quite a bit to put into those drivers. I would not run them more than 8w without a high pass filter. How is the balance between bass/mid/treble to your ears?

 

[perceval]

Website says they handle up to 40w... Which probably as bogus as the specs listed!

Haven't really listened to it yet. Just did a quick test to see if connections were proper.
I'll setup later, probably tomorrow, but I will surely need a better driver, as I was planning to replace my TABAQs with this little K at the beach...

Enjoy the Netherlands.

 

[xrk971]

I did enjoy NL and will tell you why in the Two Towers thread 🙂

 

[perceval]

Niiiiiiiiice!

 

[zman01]

I did enjoy NL and will tell you why in the Two Towers thread 🙂

Niiiiiiiiice!

🙂

 

[perceval]

Alright.

Here's the AHE driver in 0.37x K enclosure.
Not bad... with a -3dB with a gentle Q at 580Hz, I think it will be easy to listen to.

It's in freefall after 10k though....

 

[xrk971]

That looks like it should sound quite balanced. The shape of the apex of the K aperture affects the bass extension. What do you have now? Expand the cusp to a slot for more bass punch but less extension frequency wise. But the shallow roll off you have now will sound quite nice.

It does make a difference to build it according to simulations.

 

[perceval]

Simulations you've provided, thank you! So many of us are in debt to you and your prowess with Akabak.

This is the aperture I have at the moment... It was cut just before lunch, when I was quite hungry, and my hand wasn't exactly steady!

 

[xrk971]

That looks fine - I wouldn't do anymore to it. Your cone looks like got its dust cap dented with a finger poke. 🙂 kids around?

If you play them as desktops or bookshelf speaker next to a rear wall the bass will be enhanced quite a bit.

Thanks for the kind words and you are welcome.

 

[perceval]

Kids?

About a hundred! My house is also a school for local kids...
And yes... probing fingers.... That's why those AHE drivers are my workhorses / tryouts for many different designs... just for the fun of it!

 

[freddi]

that's a respectable response 😀

 

[xrk971]

I agree, as K's go it's up there with good smooth ones. A super tweeter connected with a 0.47uF cap might work well to bring up the high end.

 

[edinm]

Hello,

I am reading about karlsonator enclosures last couple of week. I decided to try and build it.

Please could you advice me about using Monacor SP250P 10" driver. Here are parameters:

https://www.monacor.com/en-cz/monaco...akers/sp-250p/

I plan to pair it with tweeter for big, nice, deep sound.



Thanks a lot

 

[freddi]

that link didn't work - here's the parameters in form for Akabak for your Monacor 250p - that's a cool looking driver

FWIW - my Karlsonator12 has tuning around 37Hz

Def_Driver 'Monacor SP250p' |Notes: 10" driver 94dB 1W/1M 3.5mm XMax 100 watts
Sd = 346cm2
fs = 33Hz
Mms = 33g
Qms = 2.33
Qes = 0.38
Re = 6.5
BL = 10.8
Le = 1.2mH
Vas = 115l