Quote:

Originally Posted by

**potterma**

So why not mod the resistor box for more output power? When I was working with Jan and the MG3, I found him to go a bit overkill with the resistor divider network. Yeah, it did kill the hiss DEAD, but, it also kills the output power. Try tweaking the resistor values in your spreadsheet to get more favorable power to the LCD-2 and see where you end up with the hiss.

You mentioned you had a spreadsheet. I don't know how its configured, but it sounds like it might do the trick for investigating other resistor combinations...

Great minds think alike potterma! I recall asking Jan not to overdo the resistance, but he argued that a headphone just doesn't need as much power as a speaker...

I've thought about doing exactly what you've suggested here, and I know that because the LCD-2 is almost purely resistive, messing with the network won't influence the sound signature as much as it would with dynamic headphones - which, I think is another reason why the resistor box I'm currently using just happens to be wonderful with the HD600 (I'm suggesting that Jan hit on an ideal ratio for the dynamic HD600, while building a resistor network for the LCD-2.

So... I'll have to build another resistor network for the LCD-2, as I don't want to disturb the one I'm now using with the HD600. I don't find the build itself daunting - it's the design that still eludes me. I can find numerous combinations of values to plug into my spreadsheet that will yield a higher power output to the LCD-2, but WHICH of countless combinations would be best?

Please correct me if any of this is wrong, but playing with the spreadsheet has revealed that I can increase output power of the resistor network shown above by reducing the value of R1 -or- by increasing the value of R2 -or- both.

So here's a question for which I can't seem to find an answer: Is there any advantage/disadvantage to maintaining the current 5:1 ratio? I've seen a lot of resistor networks that have a 3:1 ratio, as well as other ratios. Why? What criteria are honored to select the resistance values (other than just going for any combination that gives me more power than I'm getting now)?

For example, using the same schematic as shown above, my spreadsheet reveals that **all of the following values will give me 1000 mW into 50 Ohms**, instead of the 142mW into 50 Ohms, I'm getting with the TBI resistor box:

R1 = 10 Ohms, R2 = 7.92 Ohms (increasing only R2)

R1 = 2.53 Ohms, R2 = 2.0 Ohms (decreasing only R1)

And now, just a couple of the truly countless combinations that could each yield 1000 mW when changing both values...

R1 = 5 Ohms, R2 = 3.96 Ohms (decreasing R1 and increasing R2)

R1 = 3 Ohms, R2 = 2.38 Ohms (decreasing R1 and increasing R2)

**Which is "best" and why?**

Thanks!

Mike