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No, they are unbalanced.And measurements are on balanced outputs ?
No, they are unbalanced.And measurements are on balanced outputs ?
Some products I've seen use the TPA6120A2 but offer lower output resistance. DACport Slim/HD says 1 ohm and Stoner Acoustics UD125 was measured at less than 1 ohm by a reviewer. Do these products risk damaging headphones by doing this or is it not something to worry about?Topping lists the headphone drivers as TPA6120A2 - if that is the case, the 10Ω resistors on the output are there to ensure its stability with load capacitance (see page 11 of spec sheet http://www.ti.com/lit/ds/symlink/tpa6120a2.pdf). Removing them could cause oscillation. Very unfortunate that they chose the TPA6120A2 - it is a good option for cheaper designs when very high current output is required (Monoprice's own budget DAC-amp, for example), but for a "statement" DAC-amp it would have been nice if Topping had used something better, perhaps the 1688 or 1622.
No it doesn't replace the D30 as it is double the price. It is in a smaller more compact box than D30 and with a display/menu. It is very solidly built.You're all talking about the D50 from Topping. I can't find any information about it, what exactly is this device? Is it the successor of the D30?
No it doesn't replace the D30 as it is double the price. It is in a smaller more compact box than D30 and with a display/menu. It is very solidly built.
I don't know why their web site is behind availability of the unit as I have had one for a couple of weeks.
Its because they are on chinese new year for the last 8 days. And they will be on new year for the next 3-4 days still.They are waiting for your measurements and review before they put it up for sale. No pressure.
No it doesn't replace the D30 as it is double the price. It is in a smaller more compact box than D30 and with a display/menu. It is very solidly built.
I don't know why their web site is behind availability of the unit as I have had one for a couple of weeks.
No the D50 is a dual 9038 device also I believe.I've been wanting to buy a D30 for awhile now. Is the D50 basically the D10 but wall powered? Can you give any more details about it?
Thanks. Where did you find the info? Can't find anything on the net.No the D50 is a dual 9038 device also I believe.
The D10 is a 9018K2M device like the SMSL M8 but it has no external power supply
Do you mean about the D50? I believe it was mentioned here.Thanks. Where did you find the info? Can't find anything on the net.
Yep, D50. Just skimmed through the thread again, found the info. Thanks!Do you mean about the D50? I believe it was mentioned here.
You're very welcomeYep, D50. Just skimmed through the thread again, found the info. Thanks!
Some products I've seen use the TPA6120A2 but offer lower output resistance. DACport Slim/HD says 1 ohm and Stoner Acoustics UD125 was measured at less than 1 ohm by a reviewer. Do these products risk damaging headphones by doing this or is it not something to worry about?
Yes I have seen this. But which amps that "don't break the bank" are available with 0 ohm output impedance?It would depend. In concept there are alternative ways to stabilize the output, but at that point I would think that it would be simpler to implement a different solution. One could always test the devices in question with a capacitive load and see if they do, in fact, oscillate, or at the least look around the output section of the board to try to figure out what protections (if any) have been implemented.
Practically speaking I'd rather simply avoid TPA6120A2-based amps when driving low-impedance headphones with nonlinear impedance (that is, not planar magnetics) is a priority - there are better options out there that don't break the bank - but if you were really worried and already had the amp, you could use a 10Ω resistor in-line for peace of mind's sake.
Edit: As an example of an alternative solution for output protection with low impedance, NwAvGuy used an inductive ferrite chip to short the output resistors on a DIY amp using the TPA6120A2 - see subheading "Output Impedance Modification" here http://nwavguy.blogspot.com/2011/06/qrv09-diy-headphone-amp.html - and such a scheme might well be employed by the DACport Slim, Stoner, etc (although it would be unsafe to bet on it, in my opinion).