I think one reason the AMT-1 can play so low is that they have a folded area equivalent to a 5in dynamic driver. The ability to go low is all about moving more air. The AMT moves a lot of air compared to a 1in dome. But because the aperture is smaller, they retain imaging due to being close to a point source. 800Hz is very low for a tweeter.
I have no idea what the crossover frequency of the AMT is internally to the 422’s. I suspect changing the SMT MLCC ceramic crossover cap to a good poly film cap would make a big improvement over what we already hear. Will need to carefully open these up at some point.
I have no idea what the crossover frequency of the AMT is internally to the 422’s. I suspect changing the SMT MLCC ceramic crossover cap to a good poly film cap would make a big improvement over what we already hear. Will need to carefully open these up at some point.
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What is shipping for the 422H’s?
I am going to try the Melbourne headphone amp next. It’s a SE Class A design with a BJT output and a MOSFET CCS, DC coupled output.
The Melbourne Class A Headphone Amp and Pre-amp
After that I will try a 8x parallel OPA1622 amplifier.
Cheap as Chips OPA1688 Low-THD Muscle Amp
Then I will try out the Hakuin JFET/BJT two transistor CFP amp:
Hakuin SE Class A HP Amp
I am going to try the Melbourne headphone amp next. It’s a SE Class A design with a BJT output and a MOSFET CCS, DC coupled output.
The Melbourne Class A Headphone Amp and Pre-amp
After that I will try a 8x parallel OPA1622 amplifier.
Cheap as Chips OPA1688 Low-THD Muscle Amp
Then I will try out the Hakuin JFET/BJT two transistor CFP amp:
Hakuin SE Class A HP Amp
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Use this link to buy, ESS does ship outside US ESS 422H
– ESS Speakers USA
– ESS Speakers USA
You US guys are very lucky; Amazon will not ship the ESS 422 to Oz, damn!
HD
Hi Hugh,
Let me know if you still can’t get them direct from ESS. I can ship them to you if needed.
Btw, my favorite amp to drive the 422’s is not surprisingly, the zero global feedback SE Class A, JFET/BJT CFP. The Hakuin sounds amazing with these cans. The extra resolution of both the amp amp and headphone combines to a new experience.
They have 5 pairs in Germany for 249 Eur without shipping cost. That is a very fair price indeed! ESS 422H Heil Amt Headphones buy at hifisound.de
You US guys are very lucky; Amazon will not ship the ESS 422 to Oz, damn!
HD
ESS sent me a link to a US site doing a $125 promotion.
With sign up discount, I'm down for a pair for $200AUD, presumably with GST to pay on arrival. They don't ship until the end of the month, but I'm prepared to wait
Drop: Passions lead here (formerly Massdrop)
I paid by PayPal so at least if it is t legit, I get my money back.
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