Crack;Bottlehead OTL
Jan 17, 2021 at 10:42 PM Post #10,591 of 12,335
My Crackatwoa arrived on friday, hopefully I have better luck.

Got some screws from Home Depot so it’s back on!
 
Jan 19, 2021 at 1:30 AM Post #10,593 of 12,335
Jan 26, 2021 at 5:41 PM Post #10,594 of 12,335
I finally got my ZMF Verite Closed headphones yesterday. I tried them out with most of my AMPs/DACs and my favorite pairing is

Tidal > Bluesound Node 2i > Hugo 2 > BHC > VC. It's truly amazing sound and very complementary to my HD800S cans. I am going to replace my Modi Multibit with a Bifrost 2 shortly and expect that this will be my primary listening set up for my ZMF headphones. I was using the Hugo 2 until I could get the Mimby replaced. My Hugo 2 is going to be used for my IEMs.
 
Jan 28, 2021 at 4:07 AM Post #10,597 of 12,335


Just watching Metallica in one of the highest-attended rock & roll live concerts, and this comment is killing me....LMAO :dt880smile:

Metallica.png
 
Jan 28, 2021 at 11:00 AM Post #10,599 of 12,335
Is this amp powerful?

Seems to drive cans better than SS amps that should pound it on paper. My Rag 1 puts out like 3 times the juice into 300 than the BHC, but it doesn't sound like it. Bass is also much stronger sounding, but, based on what I know its a great audio result, but the amount of D & THD takes a big jump with the BHC. Put it this way there is no reason in my home system to run the HD-600 on the Rag 1 once the BHC came on-line - except to shock people.
 
Jan 28, 2021 at 1:52 PM Post #10,600 of 12,335
The Crack puts out 300mw into 300 Ohm or more. It manages to keep the output power constant with higher impedances. But can't on low impedance cans. This is a result of the OTL output stage. If you'd want to use a SS or other amp that provides 300mw into 300 Ohms. Assuming power halves when impedance is doubled in most amplifiers (SS / transformer coupled tube amps) this would equate to roughly 5-10W of power into 8Ohms as given by most manufacturers.
That's why your Crack sounds more powerful into high impedance cans; it is. Ever more so when it comes to hard to drive headphones like AKG K340's with impedances up to 800 Ohms. A normal amp struggles with cans like these because of the harsh impedance curve and people recommend to run them from speaker amps as a result; the Crack just sings like none other.
 
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Jan 28, 2021 at 4:43 PM Post #10,601 of 12,335
That's why your Crack sounds more powerful into high impedance cans; it is.

But its NOT more powerful on paper. My Rag 1 (100 wpc/4 ohms, 15 wpc/50 ohms, 750 mW/300 ohms) puts out ~2.5x more than the BHC into 300 ohms, but it sure doesn't sound like that.
 
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Jan 28, 2021 at 4:55 PM Post #10,602 of 12,335
You guys are not accounting for the force. The crack is strong with it.
 
Jan 28, 2021 at 4:58 PM Post #10,603 of 12,335
But its NOT more powerful on paper. My Rag 1 (100 wpc/4 ohms, 15 wpc/50 ohms, 750 mW/300 ohms) puts out ~2.5x more than the BHC into 300 ohms, but it sure doesn't sound like that.


I think that's typical for solid state amps, they usually put a large nominal output power on paper, but when you put them to work they may not output as much power as they put on paper. Oftentimes you'll find an 8W 300B amp sounds much more powerful than a 60W solid state amp. So I think we must discount the nominal output powers on SS amps.:dt880smile:
 
Jan 28, 2021 at 8:22 PM Post #10,604 of 12,335
I think that's typical for solid state amps, they usually put a large nominal output power on paper, but when you put them to work they may not output as much power as they put on paper. Oftentimes you'll find an 8W 300B amp sounds much more powerful than a 60W solid state amp. So I think we must discount the nominal output powers on SS amps.:dt880smile:

300B... haven't heard one in about 15 years, pretty much top of the mountain in tube-land
 
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