FE208ES-R & T900a Specifications

Posted by thetubeguy1954 (A) on February 6, 2012 at 03:34:57

In Reply to: RE: Works for Me! But is it Wrong? posted by djk on February 4, 2012 at 22:43:29:

Hello DJK and everyone else who's trying to help me. Above this post is the frequency response curves of both the Fostex FE208ES-R wide-range eight in driver and the Fostex T900a tweeter/super-tweeter. I'm still attempting to digest and understand what's been said in the various responses to my original request for help with a crossover. If I've learned anything from reading all the responses, I believe, when looking at these two charts the FE208ES-R at 100dB at 10Khz and the T900a is at approx 105dB at 10Khz.

Therefore if I decide run the 8 ohm, 99dB, FE208ES-R "fullrange" sans crossover, allowing this driver to crossover mechanically. I should use a first order (6dB/oct) crossover at 20Khz ---{ actually 19Khz when using a 1µF cap}--- on the 8 ohm, 106dB, T900a Fostex tweeter. Doing this will cause the T900a, at one octave below the 20Khz crossover point ---{at approx 10Khz}--- to be attenuated by 6dB. That in turn would now match the FE208ES-R's 100dB output at that same frequency!

Is my thinking correct on that? Have I chosen the correct XO frequency to use with these two Fostex drivers of different sensitivities? Finally have I chosen the correct value of cap to purchase until I can afford a Fostex R100t attenuating transformers? Or would you do something different?

TIA.

Not listening to anything yet.

Thetubeguy1954 (Tom Scata )

Full-range/Wide-range Drivers --- Front & Back-Loaded Horns
Central Florida Audio Society -- SETriodes Group -- Space Coast Audio Society
=================================================================================
"The man that hath no music in himself, nor is not moved with the concord of sweet sounds, is fit for treasons, deceptions, and spoils;
The motions of his spirit are dull as night and his affections dark as Hell. Let no such man be trusted."

- William Shakespeare from The Merchant of Venice; Act V,i

Thetubeguy1954 (Tom)

Central Florida Audio Society -- SETriodes Group -- Space Coast Audio Society
Full-range/Wide-range Drivers --- Front & Back-Loaded Horns --- High Sensitivity Speakers

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Follow Ups Full Thread

Topic - I Need Your Help With A Crossover Problem - thetubeguy1954 14:51:22 02/03/12 (18)

Works for Me! But is it Wrong? - Gerry E. 10:29:29 02/04/12 (10)

RE: Works for Me! But is it Wrong? - Paul Eizik 13:18:45 02/05/12 (0)

RE: Works for Me! But is it Wrong? - djk 22:43:29 02/04/12 (8)

FE208ES-R & T900a Specifications - thetubeguy1954 03:34:57 02/06/12 (3)

RE: FE208ES-R & T900a Specifications - rbanta 17:34:09 04/20/14 (0)

RE: FE208ES-R & T900a Specifications - Paul Eizik 09:55:19 02/07/12 (1)

RE: FE208ES-R & T900a Specifications - green heron 07:52:32 04/24/14 (0)

RE: Works for Me! But is it Wrong? - TubeBuilder 23:54:48 02/04/12 (3)

RE: Works for Me! But is it Wrong? - djk 02:28:46 02/05/12 (2)

RE: Works for Me! But is it Wrong? - TubeBuilder 03:13:42 02/05/12 (1)

RE: Works for Me! But is it Wrong? - djk 05:02:16 02/05/12 (0)

RE: I Need Your Help With A Crossover Problem - Duke 17:56:59 02/03/12 (0)

RE: I Need Your Help With A Crossover Problem - Paul Eizik 16:53:00 02/03/12 (3)

RE: I Need Your Help With A Crossover Problem - thetubeguy1954 09:15:50 02/04/12 (0)

Crossover - Kloss 05:22:36 02/04/12 (1)

RE: Crossover - Paul Eizik 09:47:22 02/04/12 (0)

Mundorf MSG1 1.00uf 1200 - Kloss 14:59:02 02/03/12 (1)

RE: Mundorf MSG1--1.00uf 1200v - thetubeguy1954 09:45:09 02/04/12 (0)

Follow Ups

FE208ES-R & T900a Specifications - thetubeguy1954 03:34:57 02/06/12 (3)

RE: FE208ES-R & T900a Specifications - rbanta 17:34:09 04/20/14 (0)

RE: FE208ES-R & T900a Specifications - Paul Eizik 09:55:19 02/07/12 (1)

RE: FE208ES-R & T900a Specifications - green heron 07:52:32 04/24/14 (0)

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