CFO (Chief Fun Officer)
- Feb 13, 2016
- Seattle Area
Here you go: https://www.audiosciencereview.com/...ents-of-benchmark-dac3.3545/page-2#post-85580What is the name of benchmark amp or can you link the follow up test? thanks
That was the issue in my original dummy load/test fixture as well.John was smart enough to use the splitter directly at the L30 (and even that adds small resistance). Marv uses a cable that adds output resistance basically and thus Z2 (in my previous post) is bigger so the 'effect' is bigger.
You say in this test it is Benchmark DAC3 when Benchmark's measurement graphs were for DAC1. Can you give more details about similar claims for DAC3? Did it also have the new measurements graphs showing the effect for DAC3?Here you go: https://www.audiosciencereview.com/...ents-of-benchmark-dac3.3545/page-2#post-85580
With Sony headphone as the load:
I should note that multiple designers objected to this type of testing including Andrew Mason of THX and Mathias of RME. They were right.
To be clear, if you build a low impedance kelvin type fixture to sample the output and then the problem would not exist. And then if you compare the same setup with a high impedance headphone amp, it would. This is what the original Benchmark paper showed. We (and SBAF) ran foul of building the wrong version of this fixture and thinking that two low very low impedance headphone amps would have the same problem. They do not. This is why I stopped using this setup back in 2018.
Marvey trying to make a name for himself,owner on his slong and vice versa,they wanna be big boys,but I have to wonder why they can't hang on their own laurelsBasically, the test setup and the person who performs the test are not good enough for precision analogue measurements.
I felt the same with my L30 I bought within months of interval to make sure I got another batch... that bass rolloff is felt everytime. I wonder if there's an objective measurement that can highlight this glaring deficiency or are the headphones to blame.With planar the big difference was in bass, less impactful/loose with quicker roll-off, better amping brought tight/well extended bass.
Yeah i kinda agree. My t50rp do very good bass but not sub-bass off the l30. I use my objectively inferior speaker amps if I feel the need for sub-bass from them. The l30 is completely fine with all my dynamic phones though.I felt the same with my L30 I bought within months of interval to make sure I got another batch... that bass rolloff is felt everytime. I wonder if there's an objective measurement that can highlight this glaring deficiency or are the headphones to blame.
Could somebody please (re)post the power consumption of the L30 in OFF mode? (not 'Idle' - Off !). If I remember well, it was said in this topic that the heavy power brick uses power all the time, even when the amp is turned off, and it's not negligible if the L30 remains plugged 24/7.
Same question for the E30, but in ON and STANDBY modes. In other words :
- L30 in OFF mode : ??? watts
- E30 in ON mode : ??? watts
- E30 in SBY mode : ??? watts
The heatsink is extra. The bottom is also soldered.Hello everyone. Been a silent reader of this thread for some time; but as a purchase of E30/ L30 stack is considered now, I have a question to John.
Based on the photos of L30 internals published here, the TPA6120a2 are cooled by the heatsink put on top of the chips. However as it is stated in the datasheet, "The TPA6120A2 incorporates an exposed PowerPAD on the underside of the chip. This acts as a heatsink and must be connected to a
thermally dissipating plane for proper power dissipation. Failure to do so may result in exceeding the maximum junction temperature that
could permanently damage the device.". I'm wondering if this (soldering the PowerPad to the thermally dissipation plane on top of the PCB) is done with L30?
Thanks That doesn't look like much. I thought I had read values up to 20 W or so. I must be mistaken.For L30 my measurement tool shows:
6.1 Watt when turned on (0dB, knob at 90%)
2.9 Watt when turned off
2.3 Watt power brick only (not connected to anything at the other end)
With SMPS it's possible. Not with transformers though. There's always current running through the primary side.Thanks That doesn't look like much. I thought I had read values up to 20 W or so. I must be mistaken.
I'm surprised by the power consumption when turned off or even power brick only. Wasn't there a way to reduce that to almost 0 ? The L30 doesn't have a remote sensor or a standby mode, so when it's off it should be... well, really "OFF", lol.
I wouldn't say any about DSP. But I would say there are still a lot more things to be done.Loooong time learker, 1st post.
The L30 went in to my desktop setup PC > miniDSP > SVS 3000 Micro|L30 > Headphones|DIY Class A Amp > DIY speakers.
@JohnYang1997 great little amp; mine has been very transparent, with the only negative a slight physical drag on the pot. Sorry the successful launch turned it to a PitA, but that's just the way things go sometimes.
On the headphone side, I use the Sundara's w/ https://github.com/jaakkopasanen/AutoEq/tree/master/results/innerfidelity/innerfidelity_harman_over-ear_2018/HIFIMAN Sundara PEQ on miniDSP/L30 @ +9dB and it's the only one of my numerous headphone amps that's made me like the Sundara's previously fairly bland experience. Using Qudelix 5K (PEQ) > xDuoo TA20 > Sundara, doesn't exhibit the same <60Hz tightness and airy presence.
My speakers, MDR-Z1R's and Denon AH-D7000's don't show any character development, so transparent.
This is probably the wrong place to ask, audio purests n' all, but just in case @JohnYang1997 is still reading... is there any chance Topping might consider developing a DAC w/ 4ch out + PEQ + Delay + sophisticated DSP algorythms... a miniDSP killer? When I say sophisticated DSP I mean along the lines of psuedo dimentionality, staging, reverb... or if you could implement a DSP design engine like this https://moddevices.com/products/mod-duo-x/ that would be a dream come true, ie open source the DSP effects. The Mod duo x while for music creation has a lot of useful ideas ypu can apply to standalone desktop DACs/Amps, it also rocks my world.
All my DACs ~sound the same, so I only upgrade for DSP.
Anyway L30's a great little clean and transparent amp... great job!