Greetings all. For this post, as you can see above, I've got something exotic to review / measure here at chez Archimago. It's a Pass Labs / First Watt SIT-2 stereo amplifier which was made in limited quantities back around 2011-2013.
I. MeasurementsAlright guys and gals, let's get objective.
|As usual, I will use the RME ADI-2 Pro FS as ADC and Linear Audio AutoRanger in the measurement chain. For anyone who cares still, I used a thick "audiophile" power cable as discussed here. To optimize noise level, I will run the ADC and AutoRanger devices off lithium batteries. Signal source used is the Topping DX3 Pro V2 with excellent high-resolution output.|
As you can see, I measured it across a 4Ω load. Note how low this is! Good that it's flat. On average, we're looking at just below 1.6x damping which means the output impedance is around 2.7Ω. Obviously be mindful of this and try to pair it with appropriately high impedance speakers for flatter frequency response. First Watt says it's compatible with 4-16Ω; I'd advise >8Ω if you can.
II. How does it sound?
III. In summary...
|A closer look at the Pass SIT-2 and the little DIY Hypex nCore on top.|