new accuton 173n-t6-90 improoved?

[elviukai]

hi, I wonder does anybody had recent stock(2008 last quarter) of accutons? I ordered new bunch, and for my surprise they are diferent.

impedanse has several small peaks at 1khz and break up while frequenc response extreemly flat even with no smoothing aplied at all.


173n t6-96 is more or like the same as older stock.

[elviukai]

they look the same as old. BTW sound is better .

[Hartono]

Oh my...........I'm planning to buy a pair of those, how to differentiate the batch ?


May I ask where did you buy your last batch from.

"BTW sound is better"

better is nice............


Cheers

[elviukai]

they have serial numbers a/b each . I buyed directly from factory.


the main diference is that first break up at all 10drivers is smoothed compared to older versions. on the downside I see some anomality in 900-1000hz region, slight bump and also small peak in impedanse. thought sound now somewhat smoother on transients that is realy good for trying less complex filter. sensitivity is also great(the sam as custom felx units) in MTM with home made berylium tweeters they reach 97-98db/2.83v/m in 300-18khz .

I had problem with focal beryllium tweeters both tbu and tce didnt reached that sesnitivity, finaly I build my own magnet system with provided better performance that somarium cobalt/neodymium mix.

You will not be dissapointed with theese drivers as long as you will care rest of the system(metal enclosures damped with lead at least)

have fun

[Hartono]

Thanks for the information elviukai,

I also notice the 1khz bump , now the question is , the driver is different, is it an improvement, or is it a defect or just tolerance issue (unlikely)

maybe Accuton can give some explanation. I hope I can get better sounding one when I buy mine.

compared with measurement data I saw on Htguide.com your measurement indicated smoother and more extended high end response, but it could be just difference in measurement setup/room


"finaly I build my own magnet system with provided better performance that somarium cobalt/neodymium mix."




"You will not be dissapointed with theese drivers as long as you will care rest of the system(metal enclosures damped with lead at least)"

metal...I might not be able to find machined metal and it's also costly. I will consider that.
again thanks for the tips.

I plan to match them to ribbon tweeter, and using digital active crossover(all still on planning stage) , MTM is out of question, one is for cost reason, and I prefer non MTM design.

regarding a/b on the serial number, is it for matched pair ?

[elviukai]

no its not defect, I still think that andrew at thiel does not control tight cone damping. but all old and new drivers have very low discortions, so i doubt it is a defect.

here is picture of berylium speakers (2x 173n t6- t90, custom berylium and 3x sacn speak 23w subs amped actively with 700w)


next photo is titanium tweeter also made from modified big magnets from wilson audio ( 2x custom audiotechnology units with very short VC and huge magnets providing 95db/each) and 2x scan speak 23w black version or 26w(still did not decided which version is better in this design.

I also have at home (not studio) similar speakers with passive custom audiotechnology 12" subwoofers 2 per side. each 96db@60hz(!) very dynamic sound.

[elviukai]

wilson audio alexandria version (speaker have basicaly very similar tweeter) and pretty similar sounding midranges

they all still sitting in prototype enclosures while I waiting local shop finish aluminium boxes wiew.
mdf boxes sounds very awfull no mater how we brace them..

[elviukai]

and here is pictures of watt puppy upgraded to accuton midbass(173nt6-96 and accuton bass drivers. also very dynamic (for its size)transparent sound. I tried new accuton neodymium tweeters and while they offer smoother sound they definately not in pair with accuton neadymium midranges midbas..

accuton works well with ribbons

[Hartono]

WOW........what can I say......
nice speakers there.



"accuton works well with ribbons"

I'll take note of that

[elviukai]

Originally posted by Hartono
compared with measurement data I saw on Htguide.com your measurement indicated smoother and more extended high end response, but it could be just difference in measurement setup/room

its unlikely yes they are measured under diferent conditions

if you want to compare I am atachnig old version spl. inspite both measurement was farr away from accurate(done in nearfield but unsrewed and with tons of things arround wawes bouncing) but still diference is big.as you see old version have more or less similar spl behaviuor as accuton provides