I am looking at having a cabinet maker make a pair of enclosures for the 604E. They will be about the size of the Stonehedge (9 ft3) but in an art deco style similar to the 605 or 607. I have quite a bit of Altec literature and have the graph that reflects resonance frequency, enclosure size and port size but I am not sure if it is still relevant. Given the enclosure is 9 ft3 and the resonance frequency is 27.10 what size port should be used?
Second anyone try the Iconic DN604E-16U crossover?
Yes, it's still relevant, though a calculator is more accurate than a nomograph, so allowing 0.5 ft^3 for driver and basic bracing: Speaker Box Enclosure Designer / Calculator
Attachment 3304
GM
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
GM, I'm confused. You plugged in 8.5cuft for the Vas which I assume is the 9cuft of the enclosure minus the .5cuft of the driver. Is this correct? However, when I go the the unofficial Altec site and get Vas for a 604E it is stated as 15.75cuft. Can you please help me understand the why as I plan to build a similar 9cuft enclosure but use a pair of 605B's instead. Thanks.
I am looking for the necessary port size with a given size enclosure using the specs of the 604E. It used to be you simply cut out the necessary port size and you were all done. Is tuning the port recommended using a tube? Is there a calculator to perform this?
No, did this 'on the fly' between some other tasks and screwed up!I used Qts to 'fudge' a desired result since box size was a given, just inputted the wrong gross Vb [Vas]. Should have inputted 9 ft^3 to get a ~8.5 ft^3 net Vb, hence a 6" dia. vent ~7.75" long.
I could have 'fudged' it using the correct Vas, but didn't want to take the time to look it up.
Thanks for pointing it out!
GM
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Yes, there's programs that do it, though can't think of an on-line one ATM.Originally Posted by mflaten
Ducted ports are better damped, hence damp the driver better, though a simple baffle thickness vent can do it by adding one or more layers of a tightly stretched cloth. The pioneers factored this in when choosing grill cloth densities and the main reason why they're much denser than modern day ones.
Anyway, a ~26.2"^2 square/rectangle or 5.78" dia. hole in a 3/4" [18-19 mm] baffle will work.
Really, unless you will drive it with a high output SET amp or similar, then no need to tune it to Fs, though 'in the ballpark' is usually a good choice for a HIFI app with Altec drivers in general; and if you are, then ideally you need to tune it to the driver's actual Fs for best overall bass response, rendering all this moot.
GM
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
The speakers are finished in the style of the 605. Wood is African Sapele.
Very nice - Great work.. Where did you get the Altec emblem? What crossover did you use?
Matt
<wolf whistle>
<applause>
Very nice! How do they sound!?!?
- Mike
Hi mflaten,
Congratulations on your newly build cabinet for your Altec 604E,
Last sunday while I?m having lunch to a small eatery/grocery own and manage by an old japanese audiophile, we start talking about tubes and speaker, then we talked about his Altec A5 currently set up in his room located at the 1st floor of his house (eatery/grocery are on the ground floor). Then i mentioned to him that I?m wishing to own a fair of any 15? Altec Duplex speaker (605 or 604), then he silently go staright to the stairways on the way going up to his room at the 1st floor. Then I get suprised when he came down from the stairways that he?s carrying the 14 kgs (more or less) super duplex 604E [emoji1][emoji1], and he give me an offer that i cannot refuse.. after a few minutes of checking the speaker, I leave the place with a pair of Altec 604E comes with N1500a crossover..
1 604E old screws was been broken in half and requires to drill/tap 3 new screw to fix/mount the HF cover
It needs to be recone but woofer voicecoil & HF diapraghm are still ok..
Altec 604E with N1500A Crossover - YouTube
Thanks,
Ronald
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