Seems to be quite low, read something of 1.4 to 2 kHz. For that, the thing should probably be disqualified..Do you know the input impedance of the Pre D90 ?
Seems to be quite low, read something of 1.4 to 2 kHz. For that, the thing should probably be disqualified..Do you know the input impedance of the Pre D90 ?
In theory yes, as the preamp input impedance should be at least 10x the dac output impedance, or the bass performance deteriorates (as told by my friend amp designer).Seems to be quite low, read something of 1.4 to 2 kHz. For that, the thing should probably be disqualified..
Pre 90 - Input ImpedanceDo you know the input impedance of the Pre D90 ?
You are correct, best match is through unbalanced.Pre 90 - Input Impedance
Balanced - 2,000 Ω
Unbalanced - 10,000 Ω
Denafrips Areies II Output Impedance
Balanced - 2,400 Ω
Unbalanced - 1,200 Ω
so for best impedance matching you would need to connect it unbalanced from the Aeries II into the Pre 90. The input impedance is higher than the input impedance of the Pre 90.. would it affect the performance?
What the hell were they thinking?Denafrips Areies II Output Impedance
Balanced - 2,400 Ω
Unbalanced - 1,200 Ω
No output Opamp/buffer saves a view $ and the fools will love it because they get "direct raw R2R sound"What the hell were they thinking?
What "theory" exactly is this bases on?In theory, to perfectly match the Ares II the pre should have at least 24,000 Ohm on balanced input and 12,000 Ohm on unbalanced.
Impossible to say in general without having knowledge about the exact schematics.would it affect the performance?
Perhaps they like the fact that there's a pretty high chance this DAC will sound 'different' for all the wrong reasons.What the hell were they thinking?
What "theory" exactly is this bases on?
This is not a Theory.I have a friend who designs and manufactures tube amps. I got the info on impedance mismatch effects from him.
This is not a Theory.
You just quote a rule of thumb you heard somewhere without knowledge if this as any relevance in this cases.
and that probably contributes to sound quality
Likely.I wouldn't bet the farm on it. Less is more doesn't apply indiscriminately. It all depends on what damage the individual stages does and what the total amounts to in the end.
If the AK4497 had current output, the added complexity of an I/V stage probably wouldn't amount to anything audible.
I emailed both Topping and Denaphrips. And they both didn't recommend it. Topping was especially more straight-forward with telling me no...which I found interesting since you'd figure they would want to sell me their product. I think Denaphrips adds some kind of buffer to all their dacs to compensate for the high impedance numbers. I did notice later that Denaphrips pre amps don't have particularly high impendance numbers...they are appx 10-12k...so, that makes me think it'll prob be ok to use the pre90. Idk much about this stuff. I'm curious...but just didn't want to spend the cash to just a/b test impedance matching.I email Denafrips in regards to the Pre 90 and the Ares II and they even though the impedance of the Pre 90 is a bit low that it still should be fine. Just curious where you heard that from?
1.5kΩ to 2kΩ I believe. The Ares 2 is appx 1.7k single ended 2.4k balanced. So, if u go by the 10x rule of thumb that a lot of people suggest...Do you know the input impedance of the Pre D90 ?
Thomas your spot on. I emailed Topping and they said its not a good match and should be used with DACs with 200 or less ohms impedance.I email Denafrips in regards to the Pre 90 and the Ares II and they even though the impedance of the Pre 90 is a bit low that it still should be fine. Just curious where you heard that from?
Su quale "teoria" si basa esattamente?
And?I was referring only to the ratio of 1 to 10 on the output / input impedance from source to preamp
Why should i care about energy loss?
- Best condition - low output impedance - when the output impedance (Z OUT ) is less than the load impedance (Z LOAD ). This condition is better because most of the voltage (V SOURCE ) appears across the load and very little voltage is “lost” driving the output current through the output impedance.
And this is bad why?Unsatisfactory condition - high output impedance - when the output impedance (Z OUT ) is greater than the load impedance (Z LOAD ). This condition becomes insufficient as only a small part of the source voltage (V SOURCE ) appears across the load, most of it is “lost” driving the output current through the output impedance.