[ThanatosVI]

WA33 is spec'd at 10W per channel at 32 Ohms. So power to the Susvara (60 Ohms impedance) approx. a shy over 5.3 Watts ! For Susvara this is quite low !

Hifiman EF-1000 provides 20 Watts at 35 Ohms i.e. approx. 11.6 Watts to the Susvara, i.e more than double the WA33. As Hifiman updated the EF-1000 to get the best out of their current Planers in particular the Susvara, this should be the sweet spot for power to the Susvara !.

The Trafomatic Primavera can deliver 9 Watts into 50 Ohms i.e. approx. 7.5 Watts to the Susvara.

Ok it's not just about pure power (voltage swings and current are the important parameters for such headphones like the Susvara) but there is a pattern from reviews and people using Speaker Amps that the more power (up to a point) the better the sound from the Susvara.

I haven't read a review yet that too much power (within the max power the Susvara is spec'd for of 25 Watts) diminishes the sound quality of the Susvara's being fed from a quality Amp.

However this is a rather complex topic, since the passlabs combo sounds superb while not offering much power.

25w into 8 ohm could be as low as ~3.5w into Susvara load (60 ohm)

 

[bozebuttons]

Which dynamic drivers are you using?

I have used Grados,HD800, Quialia 010,sony R10 bunch of other dynamic headphones with no issues.
Only headphone that gave me any noise issues is a hardwired ath ad-2000 with dual 3pin xlr with a 1/4 inch adapter cable probably due to ground issues .
Xa25 really takes the Hd800 sdr to new levels as well as other headphones used

 

[donato]

However this is a rather complex topic, since the passlabs combo sounds superb while not offering much power.

25w into 8 ohm could be as low as ~3.5w into Susvara load (60 ohm)

Pass always underrates their amps. If you check the stereophile review and the measurements, it actually puts out about 80W at 8 ohms. This works out to about 10W at 64 ohms.

 

[ThanatosVI]

Pass always underrates their amps. If you check the stereophile review and the measurements, it actually puts out about 80W at 8 ohms. This works out to about 10W at 64 ohms.

Didn't know that, very interesting indeed

 

[Spawn300Z]

Pass always underrates their amps. If you check the stereophile review and the measurements, it actually puts out about 80W at 8 ohms. This works out to about 10W at 64 ohms.

What calculations are you guys using to make your conversions.

 

[Bonesy Jonesy]

Pass always underrates their amps. If you check the stereophile review and the measurements, it actually puts out about 80W at 8 ohms. This works out to about 10W at 64 ohms.

I think (based on amp reviews with the Susvara) that a power rating of minimum 7 Watts to maximum 20 Watts with a sweet spot of 10 to 15 Watts is required from a quality amp for the Susvara (assuming all other connected equipment is of equal quality and provides a good to excellent synergy with the amp and Susvara).

 

[Bonesy Jonesy]

What calculations are you guys using to make your conversions.

Power to Headphone = (impedance of amp / impedance of headphone) x power out of amp at impedance of amp used.

Therefore if Susvara is 60 Ohms, and say a Speaker Amp is 120 Watts @ 8 Ohms, then power to Susvara = (8 / 60) x 120 = 16 Watts.

This is a very simplistic steady state calculation based on Ohms Laws which will not be the actual reality power but i's close enough for a general rule of thumb calc !

 

[Bonesy Jonesy]

Power to Headphone = (impedance of amp / impedance of headphone) x power out of amp at impedance of amp used.

Therefore if Susvara is 60 Ohms, and say a Speaker Amp is 120 Watts @ 8 Ohms, then power to Susvara = (8 / 60) x 120 = 16 Watts.

This is a very simplistic steady state calculation based on Ohms Laws which will not be the actual reality power but i's close enough for a general rule of thumb calc !

The type and design of the amp will play a part into the actual real power being delivered to the headphones as voltage, voltage swing and current to the headphones all play a part along with the actual design and type of headphones being used i.e. dynamic vs planar for instance !

 

[Spawn300Z]

Ok Thanks using the proportion calculation

 

[Bonesy Jonesy]

Ok Thanks using the proportion calculation

Basically yes (also termed as power ratio's equations).

If you read through the excellent 6 Moons article on testing the Susvara with different amps ; https://6moons.com/audioreview_articles/bakoon8/6/

Even though the Bakoon AMP-13R has a respectively low power output compared to the other 100+ Watts Power Amps (except for the IFI Pro iCAN which has a similar power output), it is a current driven amp hence giving the Susvara's a lot of current with a lower voltage. If the IFI Pro iCAN also sounds very good with the Susvara's as mentioned in the report, this must do the same as the Bakoon.

 

[donato]

What calculations are you guys using to make your conversions.

as you double the impedance, halve the power.
80w at 8 ohms
40w at 16 ohms
20w at 32 ohms
10w at 64 ohms

 

[ThanatosVI]

as you double the impedance, halve the power.
80w at 8 ohms
40w at 16 ohms
20w at 32 ohms
10w at 64 ohms

While we're at it.
Can someone help me how to calculate power output if I only know that the current output is 700mA ?

 

[donato]

While we're at it.
Can someone help me how to calculate power output if I only know that the current output is 700mA ?

I don't think you can if you only have that current. P = I*V power = current * voltage. You'll need more info.

 

[Bonesy Jonesy]

While we're at it.
Can someone help me how to calculate power output if I only know that the current output is 700mA ?

You also need to know either the voltage at 700mA or the impedance (Ohms) to calculate the power. All these steady state simplistic power equations are based on Ohms Law.

 

[Bonesy Jonesy]

I don't think you can if you only have that current. P = I*V power = current * voltage. You'll need more info.

Yep