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Old 12th December 2007, 06:20 PM   #1
JimW is offline JimW  United States
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Default GPA 604/Iconic 704

I would like to get some suggestions for suitable cabinets using one of these speakers. What are the differences between the GPA and Iconic drivers? Thanks
Jim
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Old 14th December 2007, 11:26 PM   #2
GM is offline GM  United States
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Greets!

AFAIK they are one and the same, but best to ask GPA just to make sure. Regardless, the ML-horn I did for Jay Fisher has enough net Vb to accommodate a variety of specs since it was designed for his ~matching (high output) impedance amps. Jay's wife is expecting twins, so this project's on hold for him, though he offered to do any changes to the drawing, so I need to get back to him, but here's the basic unfolded, bottom vented design, ergo would need to be spaced up a bit:

GM
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Old 20th December 2007, 11:25 PM   #3
ICM 1 is offline ICM 1  United States
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The Iconic 704 differs from the GPA 604-8HII in the power handling. Iconic uses high temperature voice coils and the higher power alloy aluminum diaphragm in the HF.
Despite protest from those who believe otherwise, the sound of the two is identical, the HF diaphragm sounds and measures identically to the older duraluminum unit and handles 2 1/2 times the power. The LF voice coil has exactly the same number of windings and winding length, just is made with high temperature glue and on a high temperature former instead of a paper one the GPA uses.
The last of the A/L 604s had an overdamped LF section, the current motor setup was designed by Iconic, which releaved this condition and increased the linearity was adapted by GPA in their model also. Yes, there are some differences.
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Old 20th December 2007, 11:26 PM   #4
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Good to know. Thanks for that.
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Old 26th December 2007, 11:13 AM   #5
JimW is offline JimW  United States
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Default 064/704 specs

I down loaded and printed the spec sheets for both drivers, all specs are exactly the same, look like the same exact spec sheet with a logo change, so the drivers must be identical. GM, I have a pair of 416's, what would be the feasibility of doing a 2.5 way with the 604/704 and a 416 sharing an enclosure?
Jim
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Old 26th December 2007, 02:54 PM   #6
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You'll probably have to use some form of series resistance to balance them out, but I don't see a problem beyond possibly requiring an even larger cab than posted depending on the 416, amp(s) used and desired performance goals.

GM
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Old 26th December 2007, 04:53 PM   #7
ICM 1 is offline ICM 1  United States
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Iconic is getting it together to get the website and specsheets changed, as you can tell, the spec sheets, Iconic's and GPA's were done by the same person, Iconic's was first. The power handling of the 704 sheet is a mistake, it ought to be 140 watts AES. The woofer to use with the 704 is the Iconic 164, which we do not yet have spec sheet on, it uses the same LF topology as the 704 and is the same efficiency.

Watch for changes soon.
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Old 26th December 2007, 05:42 PM   #8
JimW is offline JimW  United States
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Would it be feasible to run the 604/704 as a normal 2 way and use a plate amp with the 416?
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Old 26th December 2007, 06:09 PM   #9
GM is offline GM  United States
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Quote:
Originally posted by ICM 1
The woofer to use with the 704 is the Iconic 164, which we do not yet have spec sheet on, it uses the same LF topology as the 704 and is the same efficiency.
Good to know, thanks! BTW, which 'audio professional' are you?

GM
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Old 26th December 2007, 06:12 PM   #10
GM is offline GM  United States
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Quote:
Originally posted by JimW
Would it be feasible to run the 604/704 as a normal 2 way and use a plate amp with the 416?
Yes, and what I recommend of your two choices, assuming the plate amp is a high SQ one with enough power to keep it from clipping in a worst case scenario.

GM
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