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anyone tried the leckerton amps with the opa 627? - Page 3

post #31 of 39

I own ER4S and XBA-4 which required output imdpence of less than 1 ohms. I love to have  amp which can do justice to ER4S.Which opamp benefits me the most? Thanks in advance. 

post #32 of 39
Quote:
Originally Posted by audionewbi View Post

I own ER4S and XBA-4 which required output imdpence of less than 1 ohms. I love to have  amp which can do justice to ER4S.Which opamp benefits me the most? Thanks in advance. 

I owned the UHA-4 with the OPA209 opamps and found it to provide a very smooth and neutral balance across the full audio spectrum. I am not a big fan of the OPA627 as I personally think its performance for audio has been over-rated. I have tried it in many amps during my testing and never found an instance where it justified its cost.

IMHO, the 209 outperforms the 627 when used in battery-powered headphone amps.

I don't know what the impedance of your XBA-4 is, but with the 75 ohm ER4S, any output impedance less than about 9 should work just fine.
post #33 of 39
Quote:
Originally Posted by HiFlight View Post


I owned the UHA-4 with the OPA209 opamps and found it to provide a very smooth and neutral balance across the full audio spectrum. I am not a big fan of the OPA627 as I personally think its performance for audio has been over-rated. I have tried it in many amps during my testing and never found an instance where it justified its cost.
IMHO, the 209 outperforms the 627 when used in battery-powered headphone amps.
I don't know what the impedance of your XBA-4 is, but with the 75 ohm ER4S, any output impedance less than about 9 should work just fine.


Thanks for this, really helps. XBA-A has an impedance of 8 at 1 kHz. Will be ordering it soon. Thank you for your helpful advice. 

post #34 of 39

 

Why is this DAC/Amp not more popular?  I have my eye on the OPA627 version, love it's size.

 

post #35 of 39
Quote:
Originally Posted by kiteki View Post

 

Why is this DAC/Amp not more popular?  I have my eye on the OPA627 version, love it's size.

 


I beleive it's because Nick was in the middle of moving facilities.  He mentioned quite a bit of demand but the move hampered supply.  This should be fixed soon and the UHA4 is shipping now.  The UHA6SII has a nice new form factor.  I look forward to seeing how it compares w/ my first version.

 

post #36 of 39

Is the Leckerton UHA-4 designed differently when it's using the OPA627, or is the voltage supply +-5V as stated here?  Is that really OK?

 

Specifications

 

  • +10 dBV max into high-impedance load (>600 ohms)
  • Frequency response: 13 Hz to 22.5 kHz, +0/-1 dB
  • Output impedance: 0.4 ohm
  • Op-amp supply rails: +/-5 VDC
  • Battery life: 24 hours typical
  • Enclosure: aluminum
  • Dimensions: 3.3″ x 2.75″ x 0.47″
post #37 of 39

You would have to ask Nick.  I don't believe Nick would offer an implementation of an opamp he did not think operated properly within his topology.  Any opamp not in his list he asks you contact him directly first.

post #38 of 39

OK sent an email.

 

Really looking for a slim amplifier with OPA627 in it.

post #39 of 39

I sent two emails and no response in 2 weeks.

 

 

Perhaps some questions are best left unanswered.  Nothing to see here, moving along.

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