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In Reply to: Re: Pic and Project Description posted by jeff mai on February 10, 2007 at 14:20:41:
Greets!Hmm, can't think of one at the moment other than the designs I listed in the Altec forum thread. What are you interested in?
Follow Ups:
I can get my hands on a pair of Altec 515-16g and I was thinking of using a large Onken cabinet with EQ or series resistance similar to what kevinkr from diyaudio.com has done. What is the MLTL alternative?
Hi,I saw GM's reply to SY on the thread way down... Makes me wonder though how they time/phase aligned the Fostex(?) supertweeter mounted on the main baffle, or if alignment is critical at all if xo'd ~15k?.. Anyway, it's something to aspire to with my 414s. GM has dims dims for them posted in the archives here (thanks for the building tips GM!)
fred
Greets!You're welcome! Even with a 1st order XO, if you can hear a phase shift beyond possibly being able to discern a slight tonal difference by swapping the leads, then I imagine there's scientists that would like to 'pick your brain', so to speak.
Greets!OK, how much series R and what max cab height? The A7's 42" or ?
Series R: 9 ohms to as much as 16 ohms is what I'd intended with the Onken cabinet. I think 11 ohms was what flattened the response in the cabinet size I was looking at initially: 360 litres. Eventually I intend to build an amp with the necessary output impedance rather than waste the power in a resistor.42 inches puts the centreline of the midrange horn at 56 inches which is a little too tall for seated listening. I'd prefer them to be a little shorter, but it depends on the benefits gained from a taller cabinet.
The cabinets could be both wide and deep if additional volume is required, as the midrange horn is 30" wide and 28" long. This suits the orginal 360 liter Onken size quite well.
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