altec 420y biflex

[MartinV56]

Hello to all the members of this forum, I acquired old cabins altec, the reference is 870B Speaker System, Serial 892, Number 391916, AL75. The woofer is 420Y. I have connected them to a Set 2A3 Utopia Audio www.utopiaudio.com
I have thought to connect to along with tweeter Electro Voice TW35 wolverine 420y using the CO of electro voice C36, or any capacitors. Some suggestion for this project. Thanks, Martin

[CONVERGENCE]

The 870B system according to Altec Tech specs is a two way system
Woofer 420Y
Tweeter cone 30685
Xo around 3.5K

How do they sound ?

Convergence

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[MartinV56]

Thanks Convergence, In bass and midrange the average sound very good, but lack acute brightness or treble, why I want to adapt tweeter to him tW 35 with the XO C-36 of Electro Voice, Martin

[CONVERGENCE]

You could try it .The EV tweeter horn seems a good choice .THE tw35 came with the CR35 XO at 3500. I would go for Altec Xo N3000 . The Fr range of the TW 35 is
unknown to me though.

Convergence
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[MartinV56]

At the moment I am not used Xo some. The C36 of EV that I think to install is not properly a Xo. Martin

[CONVERGENCE]

THE C 36 IS A FIRST ORDER XO AT AROUND 3500 HZ.

There should be no problem The Altec Santana XO at 3500 HZ.

http://www.lansingheritage.org/image...ome/page03.jpg

Convergence
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[MartinV56]

HF1%20&%20MF1%20EDS Electro Voice.pdf

[MartinV56]

Convergence, Thanks you very much by your aid again thanks, Martin

[yannig]

I am listening 420A since several years with a 2A3 amp. Nice speaker and nice matching.
The treble of the 420 is very good, absolutely no "ringing", but it needs a super tweeter. I put the raven R2 ribbon, 12kHz 12dB/oct crossover but ONLY on the tweeter.

And I put these on solid maple flat open baffles. Parameters imply to much bigger enclosures for me.

Very soft, very colorful and very dynamics results.

[derik736]

I was using a pair of Biflex 420A and 420Y in open baffle as well. Beutyfull midrange and pretty deep bass for a OB. I would suggest to disconnect the tweeter on 420Y, since it it´s so high quality comparing to the low-midrange 420 Biflex. Get a pair of ESS AMT 1 tweeters (300-400$ on ebay) and you will end up in a 7th heaven. Raven R2 is pretty good too, i would also check the RAAL tweeters too, since they are most wanted in the european diy scene here. Anyway a beutiful combination for a low money