Quote:
so you're saying i should put a step down transformer on the input of my buffer and then use 4 boards for balanced drive? that sounds like a pretty good idea. Cause 2 volts out of the dac into 28 ohms produces 148 mW!! but at 10:1 its only .2 volts, which into 28ohms is 1.4mW, which would produce a little over 119dB in my jh-13's haha so even after the transformer, i will need attenuation, what do you think i should get for that, JT or lightspeed, or something else entirely, like just a RK27 or something?
wait, if i were using the transformer, i would be getting balanced, which means double the voltage i just said, man, these things really dont need much power.
thanks for the info
Originally Posted by jcx /img/forum/go_quote.gif it is not near "best", but unity buffer isn't as bad as an amp with with gain and a high Z attenuator purpose designed transformers really are the quality way to go - get a step-down with ratio sized to give proper "system gain structure" and you actually get improved S/N releative to any active device solution and with these super sensitive, low Z IEM you really need to fight for S/N given the level mismatch even with low V portable players - much less desktop source with conusmer 2 Vrms or even worse pro balanced drive levels - they will HISS your source (without added amp or buffer) is putting out hundreds of times the power neded to get to 120 dB SPL with these IEM so you can end up using > 40 dB attenuation in your signal chain for all of your listening - the same as "throwing away" >6 bits of resolution in the DAC 10:1 transformer divider ratio still lets you drive JH13 to >120 dB from consumer level DAC outputs and would reflect 2.8 KOhm load to the DAC output - which any "audio quality" op amp should drive without issue - much less audiophile designer discrete DAC I/V or buffer circuits once you have transformer coupling you autiomatically have balanced impedance drive - and you can reterminate (Ray's new 4-pin connector?) without requiring a balanced DAC output |
so you're saying i should put a step down transformer on the input of my buffer and then use 4 boards for balanced drive? that sounds like a pretty good idea. Cause 2 volts out of the dac into 28 ohms produces 148 mW!! but at 10:1 its only .2 volts, which into 28ohms is 1.4mW, which would produce a little over 119dB in my jh-13's haha so even after the transformer, i will need attenuation, what do you think i should get for that, JT or lightspeed, or something else entirely, like just a RK27 or something?
wait, if i were using the transformer, i would be getting balanced, which means double the voltage i just said, man, these things really dont need much power.
thanks for the info