L. Cao F6 - very nice with Karlsonator 6 - diyAudio
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Old 27th February 2014, 05:09 AM   #1
freddi is offline freddi  United States
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Default L. Cao F6 - very nice with Karlsonator 6

F6 sounds lovely on classical bass viola - very sensitive, excellent top end - beautiful. Greg B's little (~12X12X21") Karlson variant is good compliment and probably more effective/better sounding than a larger volume lower tuned ML-TL. Detailed plans for the Karlsonator 6 can be found at fullrangedriver buried in the Karlson section

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Old 27th February 2014, 08:42 AM   #2
freddi is offline freddi  United States
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with good recordings, the little Karlson variant and F6 L.Cao play nicely & smoothly on vocals. flamenco guitar, cello & piano sonata. There's no need for any helper tweeter. For those not familiar with Greg B's design, here's a drawing (a larger plan is downloadable from his album)

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Last edited by freddi; 27th February 2014 at 09:00 AM.
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Old 27th February 2014, 12:01 PM   #3
xrk971 is offline xrk971  United States
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Freddi,
Is that a 6 in driver or 8 in? What is the Qts on that driver becaus when I looked it seemed like they only had 8 in drivers and the T/S specs were not obvious. Looks cool with that yellow cone - what is that made of?
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Old 27th February 2014, 06:04 PM   #4
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I have an old, unused box from a discarded vintage AR speaker that's just about those dimensions. Maybe I can convert into a Karlson?!? So that's a six inch version or can I use an eight inch driver?

I have a Fostex 168z... will that work?
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Old 27th February 2014, 06:33 PM   #5
xrk971 is offline xrk971  United States
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'Zilla,
If you want to convert a box to one with a Karlson aperture, I suggest the Karlsonator as shown above and not a Karlson proper (multi-chambered bandpass reflex style a la K15). Those do not scale well below 12 in driver at all (no bass). A Karlsonator scaled for a 6 in or 8 in driver can work very well - check out some of the sims in the Karlsonator thread. My guess is FE168Z can work well. I may have sim'd it already can't recall off hand.
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Old 27th February 2014, 07:26 PM   #6
freddi is offline freddi  United States
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here are the specs on the F6 model - -cone diameter is roughly 5" not including the surround. Add 1/2 of the surround and its ~5.125" diameter - so SD for the F6 would be ~130sq.cm vs 88.25 for an Alpair 10P, or 147.41 for 12P.

search Ebay with these terms "match pair 2pcs Lcao HiEND 6.5inch fullrange speaker ,PK lowther fostex"


Zilla - if your box has this aspect then you might make a Karlsonator - otherwise it probably would still convert to some sort of K - probably with higher cutoff. Rear volume should not go below (Vas*fs*qts)/50 as a rough rule.

F6 spec (there's also an alnico version at 3X the cost) - I think F6 would be appreciated by FR lovers. Delivery was very fast - maybe a week or so from China.

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Last edited by freddi; 27th February 2014 at 07:42 PM.
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Old 27th February 2014, 09:38 PM   #7
Greg B is offline Greg B  United States
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Quote:
Originally Posted by Godzilla View Post
I have an old, unused box from a discarded vintage AR speaker that's just about those dimensions. Maybe I can convert into a Karlson?!? So that's a six inch version or can I use an eight inch driver?

I have a Fostex 168z... will that work?
I concur with xrk971: a scaled 'standard' Karlson will not have deep bass. Karlsonator is a better choice, but of course I am biased. The specs for the old FE168Z are ballpark, so it should work, but I haven't tried to sim it.
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Old 4th March 2014, 12:19 AM   #8
freddi is offline freddi  United States
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hey guys - what kind of K do you think would be most appropriate for a little B&C 10" with the following spec? a 12" could be used but this would be "cute" and probably very potent with an internally mounted K-tube with decent compression driver coming in around 1K8 - not sure if the 5mm xmax could be used without audible "gargle" - might get another dB sensitivity with half that much xmax in a B&C10. Eminence has a new 10 called LA10850 which may play well but the B&C has the prettier frame

Eminence
Click the image to open in full size.

LA10850 spec - fwiw it has low moving mass and a 4" coil so thermal compression may be relatively low
http://www.eminence.com/pdf/LA10850.pdf

the goal would be good quality sound and have more punch than a direct radiator or blh. Of course the K-tube could be mounted on top and still blend well. The result would have better treble power response than 6-8" fullrange drivers and hopefully do 120dB peaks without strain.

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Product Specifications

Nominal Diameter10"
Power Handling (RMS)250 Watts
Power Handling (max)500 Watts
Impedance8 ohms
Frequency Response65 to 3,000 Hz
Sensitivity98 dB 1W/1m
Voice Coil Diameter2.5"

Thiele-Small Parameters

Resonant Frequency (Fs)63 Hz
DC Resistance (Re)5 ohms
Voice Coil Inductance (Le)0.9 mH
Mechanical Q (Qms)3.4
Electromagnetic Q (Qes)0.25
Total Q (Qts)0.23
Compliance Equivalent Volume (Vas)0.95 ft.
BL Product (BL)16.4 Tm
Diaphragm Mass Inc. Airload (Mms)34g
Maximum Linear Excursion (Xmax)5 mm

Last edited by freddi; 4th March 2014 at 12:43 AM.
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Old 6th March 2014, 12:19 AM   #9
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Freddi:
Those F6 thingies really do look nice. What is your opinion on the 800hz dip?

Can not imagine how they managed to get so even response to 10khz 95db/2,83v with a 6" FR. Is that xmax value realistic? Better with or without the suggested smoothing filter?

Last edited by KaffiMann; 6th March 2014 at 12:27 AM.
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Old 6th March 2014, 02:42 AM   #10
freddi is offline freddi  United States
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hi KaffiMann - I'd imagine the 3mm figure to be peak to peak - - my box may have a dip in that area but things sound pretty good. I've not tried their filter -- from reading on another forum the filter suggested for one of their 8" wasn't centered properly.

Look at the impedance test I just ran on the unplayed F6 - that's one clue how they're getting good treble extension - impedance at 20KHz is only 10 ohm http://i.imgur.com/lPXJYKl.gif

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