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altec 604-8g in pi enclosure [message #33627]

Thu, 02 August 2001 14:18

RBS
Messages: 1
Registered: May 2009

Esquire

hi wayne
i recently picked up a pair of 604-8g drivers. they were originally in 3.5 cu ft vented boxes designed for soffit mounting andn in free space the bass rolled of starting at 150 Hz. any suggestions as to a pi aligned box. i'm thinking of a ported design in the corner. t/s parameters are as follows for the 604-8g
fs: 28 Hz
Re: 7 ohm
Qts: .25
Qms: 8.3
Qes: .26
Vas: 624L
Xmax: 3.8mm

thanks all

bob

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Re: altec 604-8g in pi enclosure [message #33628 is a reply to message #33627]

Thu, 02 August 2001 17:30

Wayne Parham
Messages: 18676
Registered: January 2001

Illuminati (33rd Degree)

PiAlign suggests a 5.5 cubic foot box tuned to 42Hz using a port 9.5" long and 9" diameter. You can also make the port rectangular, 10.5" x 6" and 9.5" long. These are inside dimensions of the port, and also inside dimensions of a cabinet. No displacement volume has been added, so you'll want to offset some for the space taken up by the parts inside.

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Re: altec 604-8g in pi enclosure [message #33629 is a reply to message #33628]

Fri, 03 August 2001 04:22

DFaulds
Messages: 4
Registered: May 2009

Esquire

Wayne,

That sounds like a very tasty speaker. Any idea of the low end extension?

Dave

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Re: altec 604-8g in pi enclosure [message #33630 is a reply to message #33629]

Fri, 03 August 2001 04:59

Wayne Parham
Messages: 18676
Registered: January 2001

Illuminati (33rd Degree)

Nice flat response curve, not underdamped but not overdamped either. The -3dB point is 50Hz and -10dB at 38Hz.

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Re: altec 604-8g in pi enclosure [message #33652 is a reply to message #33630]

Thu, 09 August 2001 15:33

Jeff Robinson
Messages: 26
Registered: May 2009
Location: KC, MO

Chancellor

You may want to check out the UREI 811 studio monitor design. They added another 15" woofer (from Eminence) with the 604-8G and these were one of the most popular large format studio monitors in the 80's.

It is believed that the success of the UREI 811 actually contributed to the downfall of Altec by reducing demand for Altec monitoring systems.

Jeff Robinson

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