Mini Karlsonator (0.53X) with Dual TC9FDs

[Tham]

Hi Freddi
How does it performs in these sims? Any chance that it may work in a K15?
Rgds

 

[freddi]

K15 should pretty much be like that first sim. We just don't even know even if that impedance plot is correct - but sure seems more plausible than the published specs. A 15" with that fs and relatively small published Vas would have moving mass >300g.

fwiw I think the little 115BK scaled 1.2X to K15 bulk, would make a nice little K18 / 15 for some drivers

 

[freddi]

If soecs were like my guess based on that curve then maybe a 2 chamber semi-aperiodic box like a big Dynaco A35 would work

https://i.imgur.com/VyXw1bA.jpg

 

[Tham]

Hi Freddi,
The manufacturer only recommended a 190 litre ported bass reflex box just for info.

 

[freddi]

that's a good hint - did they give tuning/ vent details?

 

[Tham]

They recommend 2 x 80mm dia ports each 120mm in length

 

[freddi]

I think that's tuned to around 26Hz

 

[Tham]

I thought it can go lower in a ported BR with a bigger box

 

[xrk971]

About a year ago I had these 0.53x Karlsonator's made with dual 3FE25-16 in espresso brown (14 coats of hand-rubbed lacquer) and black Duratex K apertures. I finally got to see them in person at my place in Michigan where they are currently in use with the big TV in the excercise room. Placed on a stand next to a wall, I was really surprised how big the sound is and how well it reached some bass notes. The sound is full rich and balanced - really nice sounding speakers. These are following the plans by jhofland and my cabinet maker did a fantastic job. Really nicely done.

Using one of those optical Toslink to RCA converters feeding a 2.1 Class D amp with Bluetooth (FOSI brand). Not sure if a sub is really needed though.

 

[Skylar88]

Wow, they are beautiful, X.

 

[famax]

I hope this helps lads

 

[jwjarch]

Those look great X! Do you have any baffle step on them or just running them straight through?

 

[xrk971]

They don’t need baffle step - the generated bass matches the highs well. I think the aperture must be contributing to the overall balance.

 

[jwjarch]

Good to know. I need to find time to build a nice wooden box for mine one of these days. I find I need baffle step with mine but it starts to create too much resonance in the foam core. I probably didn't add enough glue in some spots.

 

[kp93300]

cabinet design

l intend to build with this driver,

(pre-order promo) One Pair | 6.5 Inch Flagship Full Range Speaker Driver | Crystal-6 - Lii Audio, unique speaker, amplfier, quality and cost-saving parts for HiFi DIY

Are there any suitable plans ?

 

[freddi]

I think the original Karlsonator Six may fit that driver pretty well

Imgur: The magic of the Internet

The prototype played nicely with both a de-whizzered Fostex 164 and L.Cao F8

 

[kp93300]

Hi Freddi,
If i built it with MDF, i have to use melamine sponge to fill the area behind the speaker as advised in previous threads. How much to sponge to use ?
Secondly, the front surface of the baffle will be lined by foam?
thanks

kp93300

 

[freddi]

just my opinion you'd not have to use Melamine sponge in the front chamber as its a fairly sizable cabinet. The "stub" has to be damped on all Karlsonators

The stub fill and cabinet floor pad are probably sufficient.

 

[xrk971]

Melamine sponge on sidewalls of front chamber and rear chamber all walls in line of sight of driver backs. Front aperture line with paper faced foam core. Detailed instructions here:
https://www.diyaudio.com/forums/ful...onator-0-53x-dual-tc9fds-296.html#post5577990

Linked on first post at the bottom.

 

[kp93300]

Hi
I am being offered an very good deal for a pair of this

Markaudio Alpair-11MS 6,5" Full Range Woofer GREY

Markaudio Alpair-11MS 6,5" Full Range Woofer GREY | eBay

will the same cabinet diagram in post 3856 work ?
Thank you

kp93300