Recommend enclosure for Tesla ARO 666?

[TechnoBeaver]

Hey guys I have been keeping my eyes out for a set of speakers for a speaker build. I found these Tesla ARO 666 8ohm 5w speakers, complete with tweeters.

I have built some subs etc, and I am I pretty good carpenter, but have little technical experience with speakers.


I would consider and open baffle or horn type design, with or witout the tweeter.

These will be used (hopefully) as my main monitoring speakers for my computer/TV.

Not looking for crazy volume, but I would like to have half decent bass response. I know nothing replaces a seperate sub, I do have one to hook up when needed.

I have some specs here for it, from an old PDF. It's on page 4, http://www.classicaudio.ru/tech/tesla70s.pdf

I also found some specs from other forum members here,

Qts:0.81
Vas:17.3L
Fs:93Hz.
Re:7.7ohm
Le: ?
Xmax: ?
Qms: 4.79
Qes: 0.98
Pe: 5W (as per back of magnet)
Sd: 268.66cm^2
SPL: 94dB @1W, 1m.

Let me know what you think!

[Zen Mod]

with Qts of 0,81 horn is impossible ;

go to OB , if that is your second choice ....

but - you'll need bass helper(s) - same on OB or in some sort of box

[TechnoBeaver]

OK I slaped together some quick baffles out of some scrap 1/2" birch ply, I wanted to make sure they worked right before I spent too much effort.

The result? Very nice indeed. I've watched a few movies and listened to a few tunes, I like them.

Makes TV shows filmed outside, sound like they are outside, lot's of ambiance, but smooth.

The bass is nice smooth and musical, acoustical. Nothing crazy, but I was after a nice sound, not huge thump. The have lot's when you 3' away.

I suspect my computer monitors are helping the bass a bit, kinda extending the baffle.

I may now do something a little nicer with them, maybe a grill, or solid exotic wood of sorts. I have time to dwell on that thought.

All in all a nice little project, I needed that what with all my other intensive hobbies. lol

[GM]

Originally Posted by Zen Mod

with Qts of 0,81 horn is impossible

Fortunately, I didn't get that memo , but at 160+ L for just a 1/4 WL stub, they're a bit large for the intended app. Still, with only 5 W and most likely just a minimal Xmax...........

GM

[TechnoBeaver]

Thanks for the feedback and effort.

So I'm listening to these this morning with a fresh set of ears. I'm sold. I should have built a set of these long ago.

I've actually heard new things in songs I have heard hundreds of times, this is something I usally only experience with decent Sony headphones and my Cmoy

I can hear other band members sing in the backround. Spooky at times, have to look over my shoulder. lol

I really like how there is no box to colour the sound.

I also like how it smooths out the treble from my HTPC a bit as I listen to MP3 type media.

[PMA]

ARO666 is an old speaker, built by Tesla Valasske Mezirici, Czechoslovakia, in the sixties. It is not a woofer, it is a "midrange" speaker intended for use in large AM/FM radios. Its frequency range is 60 - 10000 Hz, rated input power only 5W, peak power 6W. Sensitivity is high 94dB/m/W.

[TechnoBeaver]

I can see you read my first post, with the link spec sheet? lol.

[PMA]

No. I have original specs, and I worked with these speakers long ago.

[GM]

OK, I was thinking of floor standing speakers and a bit longer listening distance. For up close with high Qts drivers, OB or ~aperiodic (leaky sealed cab) is best overall. Still, with a relatively high Fs you do run the risk of over-driving them with some music and of course movies even at low SPL, so a good idea to use EQ to roll them off below ~65-75 Hz. Being so close, ideally you want the tweeter to be as close to the woofer as practical.

GM

[TechnoBeaver]

Alright I rolled the 62 on my EQ down a little bit.

Quick question: Is it as much of a concern to have everything below the Fs turned down, or specifically Fs frequency?

I know that this speaker responds very little below 60, but moving the 31 slider does change it a little bit.

I'm not trying to squeeze more bass, it's more of a general question.