joseph-grado-hpa-1
  1. negura

    Official HIFIMAN HE1000 Impressions Thread

    Beta testing SQ impressions   I now have approx 100 hours on the HE1000s, having played music 24/7 through them. These are my consolidated impressions at this point. Obviously some of this may change over further listening and I reserve the right to disagree with myself on any of this in the...
  2. ECM

    Grado HPA-1 & GS1000i

    I'm currently using an RA-1 with my GS1000i headphones and would like some opinions regarding the HPA-1.    From what I have gathered, generally, the HPA-1 has "less grain" than the RA-1.   From pictures I have seen of both amps, the HPA-1 appears to be better built even though it...
  3. miziq

    Röcklinger HPA1 OTL headphone amplifier

    I haven't seen this one before::   http://www.monoandstereo.com/2013/09/rocklinger-hpa1-otl-headphone-amplifier.html  
  4. Joseph Grado HPA-1

    Joseph Grado HPA-1

    The Joseph Grado Signature Headphone Amplifier is not a production line product. It is a one at a time handmade piece of electronic equipment. This amplifier is discrete wired and individually hand assembled by two people, Joseph Grado and Tom Cadawas. Mr. Cadawas is the person who did the...
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