Raising the While Flag on 604 Project

**Panomaniac** · February 18th, 2010, 11:58 AM

What I ended up with on the Mantaray orn 604s I have was nominally ~1600Hz, 3rd order crossover with a spread. I'll see if I can find my notes.

I found that the mantaray horn just would not play down lower and stay clean.

**Altec Best** · February 18th, 2010, 12:52 PM

This is one story I don't like to read.I guess it's the part where you may Give Up.You seem to be so close.The 604 should be in a box 9cu. ft/620a for best bass performance I have a pair of 612C's that are 6.8 cu. while the bass is good the extra 2.2 cu. ft will produce much better bass response.

If anything felt like a million bucks to me I would keep them !!! And I would be looking for a new Amp

I'll be building a set of 620/modds soon as soon as this 3 ft. of snow melts

I wish you the best and hope you can stick with it especially after putting 2 years into it.

**mah** · February 23rd, 2010, 10:57 PM

This GPA 604 project had to deal with 'shoutiness'. It might be helpful.

6moons audio reviews: Steph?n's Altec 604 Dream Speaker

Cheers, Marshall.

**Seadweller** · February 23rd, 2010, 11:46 PM

Originally Posted by mah

This GPA 604 project had to deal with 'shoutiness'. It might be helpful.

Thanks mah...I actually traded several e-mail's with Stephaen, and he was kind enough to give me some advice, and send me the schematic of the 4th order crossover he currently uses...I had it built and tried it, but the sound is very dark and subdued...In all fairness, he warned me this would be the case...