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Just listened to some Fostex T50RPs today... WOW! - Page 682

post #10216 of 10223
6/15/13 at 5:24pm
Quote:
Originally Posted by Armaegis View Post

Could it maybe be pad spacing? or driver mismatch?

 

I've seen that a few times.  etysmile.gif

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post #10217 of 10223
6/15/13 at 7:59pm
Quote:
Originally Posted by mrspeakers View Post

You can always put an inline resistor in the "+" lead of the channel with more output.  To reduce the gain by about 2dB, just buy a few 1/4 watt resistors (make sure they're non inductive).  If it's really about a 2dB error across the spectrum, adding an inline resistor between 8.2 and 15 ohm should do the trick.  If your driver is exactly 50 ohms a 12 ohm resistor should do as a first test, and adjust and replace as needed.  I've found the Fostex drivers can vary, I've seen 48 and 57 ohms, so a few trials may be needed (especially if your 2dBis a swag).

 

A more accurate way (assuming you have a multimeter) is to get a variable resistor and trim it until it sounds balanced, then measure the resistor and replace it with a quality non inductive network of resistors giving the same value...


Hey there Speakers. Have you ever thought of creating a plug with two slots to insert resistors into? It would be a cheap enough item to create and being able to play with impedence would most likely prove irresistable to the community.wink.gif

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post #10218 of 10223
6/15/13 at 10:02pm
Quote:
Originally Posted by mrspeakers View Post

 

I've seen that a few times.  etysmile.gif

 

 

Dan,

 

Based on all your time spent modding so many pairs of Fostex, have you seen evidence of sound quality being vastly different between different pairs of T50RPs?

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post #10219 of 10223
6/15/13 at 11:02pm

In my experience, driver mismatch has a strong effect on the perception of sound quality. Possibly moreso than overall frequency response (within reason). 

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post #10220 of 10223
6/16/13 at 12:16am
Quote:
Originally Posted by PhaedraCorruption View Post

Dan,

 

Based on all your time spent modding so many pairs of Fostex, have you seen evidence of sound quality being vastly different between different pairs of T50RPs?

 

Yes.  We have a target sound/response, the majority of units are right there first pass, but some take quite a few passes to make the curve, and a some never do.  Channel mismatch isn't too common once you rule out the easily cleaned oxidation on the cables... 

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post #10221 of 10223
6/16/13 at 12:17am
Quote:
Originally Posted by Armaegis View Post

In my experience, driver mismatch has a strong effect on the perception of sound quality. Possibly moreso than overall frequency response (within reason). 

 

Yeah.  That's much harder to address than a phone that's more or less efficient than usual but otherwise has a similar response. 

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post #10222 of 10223
6/16/13 at 12:21am
Quote:
Originally Posted by Hutnicks View Post


Hey there Speakers. Have you ever thought of creating a plug with two slots to insert resistors into? It would be a cheap enough item to create and being able to play with impedence would most likely prove irresistable to the community.wink.gif

 

Maybe sometime... :-)  Irresistorable is hard to resist.

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post #10223 of 10223
6/16/13 at 10:22am
Quote:
Originally Posted by mrspeakers View Post

 

Maybe sometime... :-)  Irresistorable is hard to resist.


Now that's almost sounding like a product namebiggrin.gif

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