Topping L70 Fully Balanced NFCA Headphone Amp - 4-Pin-XLR/4.4mm Balanced/6.35mm SE Headphone Jacks Amplifier 7500mW x 2 Ouput R2R Volume Control HiFi Amp Audio Hi-Res Preamplifier(Black)

I have half a dozen DACs at any given time, but this is my permanent keeper. Amir at Audiosciencereview did measurements and it's flawless. I use an optical USB cable into it with an adapter and performance did improve slightly. The 9028Pro is a proven design and it fits on most of my amplifiers easily (if it's a hot one like the SMSL H300 I put it on a slotted 15" monitor riser for cooling).I'm using it tonight to compare the Topping A70Pro and the Singxer SA-1V2 that came in this week. I like the crisp display, and the new firmware added DPLL settings for adjusting optical connections for best performance. This is a huge help if you're connecting a TV or other device like that.This is one of those things they're not going to improve on since it's hit the limit of human hearing, perfect is perfect. My daily driver is the Topping A70Pro and E70 9028Pro and I buy $7k a month of audio equipment and have my choice of anything on the market. I did tests with the E70 Velvet and D70Pro Octo and Sabre in the same room over days with volume matching, and there's no way you'll hear the difference between them. Grab one and never upgrade your DAC again. Pair it with an A70Pro and you're never going to hear anything better.

This is a fantastic amp. I originally had issues with an Smsl c200 I purchased producing clicks/pops on my MacBook (this is apparently an issue with some Smsl products and other dacs with xmos chips through usb). So instead I got this and just used my MacBook’s internal dac, with a 3.5mm to rca cable. The sound is clean and there is a lot of headroom for eq. I don’t have any headphones that are difficult to drive but I have many iems, and sensitive headphones that still sound clear in low gain mode. I had a lot of noise running 3.5mm to xlr from my windows pc, so I ended up using an ikko itx-01 I had laying around. This unfortunately introduced a ground loop, but the ground loop switch eliminated nearly all noise. This feature alone makes the L70 a notch above its competitors. There is also a 12v trigger, which I have yet to use, but a very cool feature to automatically power the device on. I don’t really need the E70, but I like the convenience and aesthetics of having matching Dac amps. But for now, running from both my MacBook’s 3.5mm and an external dongle on my PC, this amp is amazing. I will stick with topping for dac/amps from this point forward.

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I have a background in electrical and audio engineering, and previously used the Topping DX7 Pro for a few years which I used to drive a 2.1 active speakers+subwoofer setup, as well as headphones and IEMs (its biggest flaw, albeit small is the high output impedance on the headphone amp which can affect the frequency response of low impedance headphones). I had intentionally picked the DX7 at the time because it was an all-in-one integrated DAC+amp, but more recently, I purchased a MiniDSP Flex to use as a DAC with the benefit of getting Dirac room correction (which gives a better resulting sound than I can ever get playing around with just PEQs in REW and Peace in Windows). So now I was in the market for a headphone amp and speaker pre-amp. Enter the Topping L70.The Topping L70 lets me keep the single-ended 6.35mm, and differential/balanced 4.4mm and XLR headphone plugs that the DX7 had, while acting as a pre-amp to my active speaker setup connected over XLR (the subwoofer is directly connected to the Flex, only the bookshelf speakers get passed through the L70 as a pre-amp). With the newer features this offers (improved HPamp which provides more than enough power with >120dB SINAD on both the balanced and unbalanced plugs, volume memory, up to 21bits of dynamic range resolution to take advantage of 24bit audio), I would consider the L70 endgame material that can be paired up with any discrete DAC of your choosing, especially at its price point.