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is Dynahi can handle Low Impedance Headphone?

post #1 of 11
Thread Starter 
Hi All,

As i know that the Dynahi circuit is design for high impedance Headphone like K1000.
Is it possible to handle Low Impedance Headphone like Grado as well?

In other hands, is PS-1 + Dynahi = Good Combo?

Thanks
OutMiC
post #2 of 11
i do believe that a dynahi will handle any and all dynamic headphones with class and confidence.
post #3 of 11
That is pretty much what is what it was designed for!

It is an amazing match with Grados.
post #4 of 11
I have measured the performance of the dynahi at 33ohms and 330ohms. The circuit easily drives 33 ohms.
post #5 of 11
Dgardner : did you make any noise measurements ? From what I've been told from reliable sources, the Dynahi has a significantly higher noise floor, due to his use of more powerfull transistor and the near-impossibility to get a power supply as clean as for the "dynalo"
post #6 of 11
Sorry to make the thread off topic - but can a dynalo be relied on to power hd650s?

Rob.
post #7 of 11
nope
post #8 of 11
Quote:
Originally Posted by 00940
did you make any noise measurements ? From what I've been told from reliable sources, the Dynahi has a significantly higher noise floor, due to his use of more powerfull transistor and the near-impossibility to get a power supply as clean as for the "dynalo"
My Dynahi RMAA Results show that the unit has a very acceptable noise floor with a 33 ohm load. The area I am battling with is crosstalk. Since I recorded these tests, I have rewired the amp and psu in many, many ways. The only improvement from the graphs you see, was made when I ran the headphone jack ground wire directly back the PSU ground terminal, instead of the amp terminal block ground. After that, the "resistive type crosstalk" figure measured identical, but not any lower, for each channel. I am using the stock group buy boards and dynahi psu board. I have given exceptional care and some experimentation to all of the ground wiring. I'm not sure better performance is possible without design topology and/or layout changes.

If you read Doug Self and Randy Slone, they talk about crosstalk that is independent of frequency as being "resistive crosstalk". At this stage of the game with my experiements and measurements, it's more of an academic challenge to get the crosstalk lower. Perhaps I'll hack the design to attempt to lower it.
post #9 of 11
Quote:
Originally Posted by robzy
Sorry to make the thread off topic - but can a dynalo be relied on to power hd650s?
Certainly, unless you demand truly frightening listening levels. Look at all the good reviews of Gilmore Lite and GS-1 owners that have HD-650's.
post #10 of 11
Both the Dynahi and Dynalo were designed for Grado headphones, also AFAIK the powersupply is one of the cleanest in it's class. It should only loose on the noise department to a jung super regulator or similar such ludicrous work.

robzy in case you don't read skyscraper's sarcasm yeah the Dynalo is more then adequet for the hd650s, 3 of us brisbanites use them for our 580s 600s and 650s and it's by far one of the best sounds we've ever achieved from these phones, although you may need your gain turned up as in one case where the source was very low.
post #11 of 11
In actual fact i didnt get skyskraper's sarcasm. Phew, i was kinda worried that when i finally went for a pair of Sennheiser's my soon-to-be-born dynalo might throw a fit.

Good to hear that my fears were unfounded though

Rob.
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