Rudistor realeased a new flagship amp - Page 11

Quote:

Originally Posted by baka1969 

So the balanced B22 puts out 72 watts @ 8Ohms?

Well, AMB says it can swing over 20 volts peak. So if we limit it to just 20 volts, that's 25 watts RMS into 8 ohms and if you bridge, that's 100 watts. That's perhaps a bit more than it can actually do though seeing as it's just using a single pair of MOSFETs in the output stage. But my point though was that ideally, a bridge amp, assuming it's being fed a balanced signal that's twice that of the unbalanced output, gives you four times the power.

se

Quote:

Originally Posted by baka1969 

I don't know. Maybe someone can answer that. Say 2x gain on the balanced b22? Even so, I'm not sure 2x would suit the HE6. Even balanced.

2x when balanced (i.e. effective 4x) is fine with the HE-6 if your source outputs 4Vrms or higher. The B22 volume control will be in the 1-3 o'clock range for a 4Vrms source.

Quote:

Originally Posted by MacedonianHero 

Quote:

Originally Posted by IPodPJ 

The B22 can output 18W into 8 ohms unbalanced, and 50W into 8 ohms balanced, so it has plenty of power on tap for the HE-6 @ 50 ohms.

 

Cool...thanks. Just a quick question, how many watts would that be into 50 ohms?

Unbalanced, just about 3W, and I think 7.8W balanced.

The EF5 amp that Head Direct uses with the HE-6 puts out 2W per channel into those phones.

Quote:

Originally Posted by MacedonianHero 

Quote:

Originally Posted by IPodPJ 

Unbalanced, just about 3W, and I think 7.8W balanced.

 

The EF5 amp that Head Direct uses with the HE-6 puts out 2W per channel into those phones.

Cool...thanks!

Correction, 2.88W unbalanced, 8W balanced into the 50 ohm HE-6.

I'm not too good with these formulas, and it requires several steps in order to figure it out.

Here's a website:

http://www.the12volt.com/ohm/ohmslawcalculators.asp#power

that does some calculations, but you have to go through several conversions before you get to the answer you were seeking.

18W into 8 ohms = 12V

50W into 8 ohms = 20V

Then you can plug in the voltage figures and get your answer.

So for anyone using the HD800, a 300 ohm headphone, you'd get 480mW unbalanced, 1.33W balanced.

If you're using a Beyer, like a T1 with 600 ohms, it's 240mW unbalanced, 677mW balanced.

The max power handling of the HD800 is 500mW.  Max power handling of most 600 ohm Beyer phones is 200mW.

With a gain of 2x and an input voltage of 5.33V from my DAC, I'm getting somewhere around 330mW into the HD800, which is somewhere around 123dB.  Using the 23 step DACT attenuator, I never turn it higher than the 2 o'clock position.

Quote:

Originally Posted by Steve Eddy 

Yes, but balanced outputs are typically just twice their unbalanced output. And when you double voltage, power quadruples.

 

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Yes, I am very aware that P=VI. My point was that to achieve equal volume, someone with a 1Vrms source would need 4 times the gain of someone with a 4Vrms source, so claiming that an amp with a given gain can/can't drive a headphone is not meaningful unless their source is also known. 
 

Quote:Originally Posted by bcg27 




"Yes, I am very aware that P=VI. My point was that to achieve equal volume, someone with a 1Vrms source would need 4 times the gain of someone with a 4Vrms source, so claiming that an amp with a given gain can/can't drive a headphone is not meaningful unless their source is also known."

I believe my DAC is 2Vrms.

Quote:

Originally Posted by bcg27 

Yes, I am very aware that P=VI. My point was that to achieve equal volume, someone with a 1Vrms source would need 4 times the gain of someone with a 4Vrms source, so claiming that an amp with a given gain can/can't drive a headphone is not meaningful unless their source is also known. 
 

Ah, gotcha. Agreed.

se

Quote:

Originally Posted by Steve Eddy 

 

Sure. But if we use the "rule of thumb" model, you're looking at $4,000 in parts cost. And I'm having a hard time seeing $4,000 worth of parts in the Pinnacle.

The rule of thumb is actually 1:3-1:5 when setting a price.  If I were to use 1:3 for some of my products then they would be sold at a loss given how much effort goes into making them. 

You guys took the Rudistor amp thread, dunked it in applesauce, and turned it into a B22 and electronics calculations thread.

Quote:Originally Posted by immtbiker 

"You guys took the Rudistor amp thread, dunked it in applesauce, and turned it into a B22 and electronics calculations thread."


The Rudistor is a b22 so it's not exactly a stretch. You even said it, we're just comparing apples to apples.

Quote:

Originally Posted by immtbiker 

You guys took the Rudistor amp thread, dunked it in applesauce, and turned it into a B22 and electronics calculations thread.

Kevin's fault.

se

Quote:

Originally Posted by baka1969 

Quote:Originally Posted by immtbiker 

"You guys took the Rudistor amp thread, dunked it in applesauce, and turned it into a B22 and electronics calculations thread."


The Rudistor is a b22 so it's not exactly a stretch. You even said it, we're just comparing apples to apples.

You sure about that? :p

The Bellatone Audio thing is though. 

Its always my fault.

Quote:

Originally Posted by baka1969 

The Rudistor is a b22 so it's not exactly a stretch.

What?  How do you figure that?