604 8G Big cabinets big sound

[604man]

The internal duct is 10 1/4 in. long , The L & R side braces are 5X3/4X53 in.
The T vertical brace is 5 1/4X3/4X25 in. The T horizontal brace is 6 3/4X3/4X33 in.
The back brace is 5X3/4X51 in. The back mounting frame is 1 1/2X3/4x172 in.
Stuffing is fibreglass, 22 wood screws holding the back panel , internal crossover volume is 3 3/4X4X5 in.
..........GC

[cradeldorf]

If they sound as cool as they look I'm guessing they sound absolutely fantastic.

[604man]

Subtracting the brace,driver, crossover and duct 6 in. L volumes, I have a Vb of 20.227
cu. ft or 572 litre...Box tuning is 19.04hz.. Response is 10DB down at 20 hz, But given
room gain of 3 to 9 DB up to 12 DB depending on venue to bring the frequency response up.....HTTP://micka.de/org/en/index.php#ideal is the online box calculator... I hope I entered the data corectly.......In spring I will try trimming & tuning the duct.............This is an on going project! 30+ years.

MUCH THANKS FOR GM'S INPUT!

I might add, I am *NOT* a cabinet maker and this was a father & son project (I am the son) And dad was an audio buff from the 40's & 50's. He really liked this project and the baltic birch plywood with its uniformity and constistancy makes construction easy. With the braces installed as shown in the photos, the cabinets are quite stout.

As far as sound , synth, organ, tympani come through with "Presence".......GC

[604man]

Thanks for posting these photos ! ............GC