RE: The Rola is reading 4 ohm...odd - AstroSonic - Vintage Asylum

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RE: The Rola is reading 4 ohm...odd

In Reply to: RE: The Rola is reading 4 ohm...odd posted by DavidLD on February 3, 2012 at 11:39:17:

Agree that the Rola is a replacement driver. If the speaker with the rola driver is the louder of the 2, adding some series resistance (bringing the total to about 8 ohms) might help. The Maggie amp probably has output transformers with 4 ohm secondaries, a possible advantage for the Rola.

The KN3005 was not listed in the Allied 1963 catalog. It was listed in the Allied 1966 catalog at 29.95. All 3 drivers were specified as having alnico magnets. By 1969 it had morphed into the KN3005A, which had ceramic magnet drivers. Same driver diameters, enclosure size, crossover frequencies (800 & 5000HZ), weight and price.

The enclosure volume and tuning are unlikely to be optimal for the Allegro drivers. The voicing will not be the same either. The Utah 10 had a paper surround and relatively light cone. The Allegro was a T/S based design, with a heavier cone and high compliance cloth surround. The 10 inch was run wide open (full range). The 'woofer cap' was actually the 1st order high pass network for the midrange. There should have been a cap for the tweeter as well. Series resistors were used for attenuation.

I think there is a good chance of finding a replacement Utah driver on eBay or at a local hamfest.

Regards,

Bob

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Follow Ups Full Thread

Topic - Knight Speaker woofers ID - sanman 15:53:14 02/02/12 (13)

RE: Knight Speaker woofers ID - elflow 09:50:37 02/03/12 (0)

RE: Knight Speaker woofers ID - DavidLD 16:14:28 02/02/12 (11)

You were right - DavidLD 16:27:23 02/02/12 (10)

I have them as ROLA - FenderLover 16:37:18 02/02/12 (9)

So, a Utah original (328).. - sanman 20:28:27 02/02/12 (8)

Sorry about that. - FenderLover 23:38:14 02/02/12 (7)

By OEM do you mean - sanman 07:53:50 02/03/12 (6)

RE: By OEM do you mean - FenderLover 08:49:26 02/03/12 (5)

The Rola is reading 4 ohm...odd - sanman 10:34:28 02/03/12 (4)

RE: The Rola is reading 4 ohm...odd - DavidLD 11:39:17 02/03/12 (3)

RE: The Rola is reading 4 ohm...odd - AstroSonic 10:15:00 02/04/12 (0)

RE: The Rola is reading 4 ohm...odd - sanman 12:42:00 02/03/12 (1)

RE: The Rola is reading 4 ohm...odd - DavidLD 13:23:23 02/03/12 (0)

Follow Ups

RE: The Rola is reading 4 ohm...odd - AstroSonic 10:15:00 02/04/12 (0)

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