Sica 5" and 6" hifi coaxials measurements

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Marveloudio

Sin Bin
Joined 2004
Hello fi-guy! Okay thx for stating your subjective impressions so far!

So we have 4" , 5" and 6" coax drivers from Italy/Sica for a fair price , sad to see such rare feedback about them on the net!

DIY needs more spreaded around , gaining attraction for newbies!

If anyone has a most wanted link list for offer for DIY please add this one :

https://diy.midwestaudio.club/

Maybe there are much more links , if so throw us your best places!

plywood paradise where are you :)
 
b_force

b_force

Member
Joined 2004
oneworldconcepts.com/
Marveloudio said:
Regarding 4, 5 and 6 inch sizes , these are hot babes , who cares about Klippel - looks are everything :

https://audiotechnology.dk/c-quenze/

https://audiotechnology.dk/flexunits/

Like a swiss watch but for your ear :)
Click to expand...
Very over priced (probably because of low quantities) with very standard open tooling frames and other parts.

But your comment about looks isn't that far of.
Yesterday I spend an entire day talking with a client because the current idea didn't look right.
Which I also totally agreed with.

It's kinda fascinating, because at least 50-70% of my job is to fix these kinds of things.
Which than creates a tango dance again with the acoustic part.
 
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b_force

b_force

Member
Joined 2004
oneworldconcepts.com/
profiguy said:
Its a bit of both, but having dealt with the Sica 5.5 in small nearfield designs, it was evident by removing the HF element how little room there was for the tweeter itself.
Click to expand...
It totally depends where de demodulation rings are being positioned.

There is a upcoming solution from another brand (which I mentioned before) and they still have a demodulation ring inside their coax.
 
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profiguy

profiguy

Member
Joined 2007
Marveloudio said:
Regarding 4, 5 and 6 inch sizes , these are hot babes , who cares about Klippel - looks are everything :

https://audiotechnology.dk/c-quenze/

https://audiotechnology.dk/flexunits/

Like a swiss watch but for your ear :)
Click to expand...
I honestly don't see (or hear) the so called value in AT drivers. They have average sensitivity and FR for the type of cone material and profile they use.

I'd pit any of the Peerless NE series against these AT drivers. The NE123W, 149W and 180W are some of the finest paper cone drivers I've ever heard and worked with, especially being a Chinese built product. Large Ti VC formers, open cast frames with excellent ventilation and copper in the gap are relatively high end features, yet they usually sell for under $100. Too bad Peerless now made them available only in large quantities. The NE123 and to some degree the NE149 can even be considered as full range drivers.
 
M

Marveloudio

Sin Bin
Joined 2004
Yes it seems the AT stuff from Denmark is somewhat outdated and very high priced .

The 4" is a 5" , having 96cm2 effective radiation area , and underhung coil! (but aluminium former to get a braking effect for excursions more than 3.5mm theoretical Xmax5/one-way) For this one 240eu seems okay for me , and the 5" is a 6" with 137cm2 area , only 265eu , not bad! Handmade drivers with good chance getting repaired with original parts!

A fair comparison of similar sized drivers would be awesome but rarely found , but recently I came across this one :

Even with the limitations of YTVids the R6meta delivers more clarity , depending on music content (quality) , checkout audio samples starting around 13:18min ... of course could be a false impression because the freq resp of the R6meta could have a broad peak of 2-3dB somewhere ...

I agree the NE149-4Ohm has a fantastic FR , measured by Hifi Compass - for a fair price (but remember it was way higher in the past) ...

At some point , all good drivers are sounding equal!(?)

The music is the ultimate decider :
 
b_force

b_force

Member
Joined 2004
oneworldconcepts.com/
Here some measurements.

Hopefully I can do a full set next week or the week after.
Not sure exactly about SPL, but must have been around 90dB @ 1m or so.
Measured with Line Audio Microphone at 96kHz Sample rate in a VERY stuffed little cabinet of just a few liters.
So some very small issues might show up from internal resonances.
edit: resonances will be around roughly 765Hz, 1150Hz and 3kHz
Nothing really to see there :)

Although we've already decided to go for the other mysterious coax

This is the SICA 5 inch coax.
blue: 2nd order
green: 3rd order
red: 5th order

(other harmonics didn't show any relevant data)

Woofer at 10cm:
sica_5_coax_dist_woofer_10cm.png


Tweeter at 28 cm:
sica_5_coax_dist_tweeter_28cm.png


Freq resp of the tweeter on-axis, 26x40cm baffle driver placed at 30cm.
Distance about 80cm or so
sica_tweeter_freq_resp.png


There is a bit of a dip around 11.5kHz
I haven't checked other measurements yet or if that could be an issue of the baffle.
Nevertheless, any dip that high is not problematic.
 
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