RE: Altec Model 19 - N1201-8A Crossover Question

Posted by Steve O (A) on August 30, 2015 at 18:05:13

In Reply to: RE: Altec Model 19 - N1201-8A Crossover Question posted by DaveV on August 30, 2015 at 13:22:42:

i have a pair of M19s and my take on the X-over controls is:

1. The controls while commercially avail L-pads are actually connected in-circuit such that they're really simple rheostats. One control makes use of the 8 ohm section and the other uses the 35 ohm section.

2. The 8 ohm control affects all frequencies above the ~1200Hz Xover point. The 35 ohm control is part of a bridged "T" attenuation network designed to introduce a variable midrange dip in response. The mid response dip is greatest when the 35 ohm control is set to 0 ohms and is minimum at 35 ohms. Since the Altec driver/horn combo has a pronounced midrange "prominence", the 35 ohm control appears to provide a midrange boost or cut depending on its setting.

I modeled the electrical response of the Xover some time ago. The plots from the model were "interesting". I'll edit a plot or two into this post if I can locate the model on my computer.

I found achieving proper adjustment of the controls to be counter intuitive compared to pretty much every other speaker I've owned because they greatly interact with each other. I ended up setting them by ear using an iterative process.

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Follow Ups Full Thread

Topic - Altec Model 19 - N1201-8A Crossover Question - Synthsayer 13:41:44 08/29/15 (17)

RE: Altec Model 19 - N1201-8A Crossover Question - Synthsayer 09:33:45 09/03/15 (0)

RE: Altec Model 19 - N1201-8A Crossover Question - Synthsayer 13:01:37 09/02/15 (0)

RE: Altec Model 19 - N1201-8A Crossover Question - Synthsayer 11:31:39 09/02/15 (0)

RE: Altec Model 19 - N1201-8A Crossover Question - Synthsayer 11:20:53 09/02/15 (0)

RE: Altec Model 19 - N1201-8A Crossover Question - DaveV 07:54:15 08/30/15 (12)

RE: Altec Model 19 - N1201-8A Crossover Question - Synthsayer 09:45:36 08/30/15 (11)

RE: Altec Model 19 - N1201-8A Crossover Question - Synthsayer 09:09:26 09/02/15 (1)

Altec Model 19 does not use a... - Cougar 11:22:43 09/02/15 (0)

RE: Altec Model 19 - N1201-8A Crossover Question - DaveV 13:22:42 08/30/15 (8)

RE: Altec Model 19 - N1201-8A Crossover Question - Cougar 19:15:48 09/01/15 (1)

RE: Altec Model 19 - N1201-8A Crossover Question - DaveV 19:48:12 09/01/15 (0)

RE: Altec Model 19 - N1201-8A Crossover Question - Synthsayer 13:05:16 08/31/15 (0)

RE: Altec Model 19 - N1201-8A Crossover Question - Steve O 18:05:13 08/30/15 (4)

RE: Altec Model 19 - N1201-8A Crossover Question - Synthsayer 13:04:03 08/31/15 (0)

RE: Altec Model 19 - N1201-8A Crossover Question - timoteus 19:34:55 08/30/15 (2)

RE: Altec Model 19 - N1201-8A Crossover Question - Synthsayer 13:00:08 08/31/15 (0)

RE: Altec Model 19 - N1201-8A Crossover Question - Steve O 20:08:57 08/30/15 (0)

Follow Ups

RE: Altec Model 19 - N1201-8A Crossover Question - Steve O 18:05:13 08/30/15 (4)

RE: Altec Model 19 - N1201-8A Crossover Question - Synthsayer 13:04:03 08/31/15 (0)

RE: Altec Model 19 - N1201-8A Crossover Question - timoteus 19:34:55 08/30/15 (2)

RE: Altec Model 19 - N1201-8A Crossover Question - Synthsayer 13:00:08 08/31/15 (0)

RE: Altec Model 19 - N1201-8A Crossover Question - Steve O 20:08:57 08/30/15 (0)

RE: Altec Model 19 - N1201-8A Crossover Question

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