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WolfX700 Measurements of Topping Pre90/Ext90 Preamplifier/ Extender
- Thread starter WolfX-700
- Start date
@WolfX-700 Is it possible to measure THD+N vs Volume adjustment (or vs "time" by adjusting volume manually, if more convenient) with a nominal fixed voltage at the input ?
To see the pros of [fixed DAC + Pre] versus [adjustable DAC]
To see the pros of [fixed DAC + Pre] versus [adjustable DAC]
OK, I won't. I was looking forward to it but IMO this is unacceptable for a pre as it should be properly buffered to work with a variety of sources, DC coupled or not.
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Right a trigger will be the cherry on the cake!
Not sure about all, but A90, L30, A50s, and this, thanks to John's obsession to lead the SINAD chart.
Don't want to hijack this thread, but I'm sure there are plenty of us who would love an education on why low input impedance is good/bad. The Schiit Freya S looks like the most direct competitor to this preamp, at least in terms of use case, and it doesn't even list input impedance. https://www.schiit.com/products/freya-1
Low input impedance is particularly problematic when the source output impedance depends on the frequency, such as in case of capacitor coupled outputs which are common in older gear, and you end up with low frequency droop. There's nothing good about low input impedance, in this instance it's a side effect of omitting the input buffer with the only reason to post a good SINAD value on this forum. If you think about it, it's those with legacy gear who should be the target customers for such a preamp, yet due to its low input impedance it may not be an ideal pairing.
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OP
- Thread Starter
- #57
My goodness...I also suggested adding a trigger function... But it was rejected by Topping...
Thanks Wolf !
The effect of the internally gain switching is well shown. And indeed, the APX's noise floor seems dominating the measurement.
Too bad! according to what I can see in the AVS threads, I think there is a lot of people like me who aim to combine home cinema and hifi in the same set-up. Since these days most of the DAC or DAC+preamp solutions are all giving stellar measurements, I do not understand why Topping, SMSL or Gustard do not add new features in their new devices which can improve the customer experience instead of being engaged in a race to implement the last DAC from AKm or ESS. It will be much more helpful for them to differentiate from competition.
Just bumping a previous question: can you use RCA and XLR as switchable inputs? Would really liked to see at least two inputs on something claiming to be a preamp, you almost have never seen something been called a preamp with only one input, this makes it basically a volume control.
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