Good gain versus a tube one I had. No complaint .
Thanks to seller, no needed extra pay for customs. The device is little bit quiet, comparing with build in amplifier. No noise. Velvet low frequencies. Good detail. Good instrument location. And it is good for some upgrade: 1.First, I will change a power adapter with this the sound is a bit grainy. Tested with disconnecting power (device works about 1 second without power) – sound became clearer. I will try to power device with stabilized 12 V or use a 12 V battery. 2.Change a big capacitor inside device to some for audio ( MUSE or similar). 3.Inspect these yellow capacitors inside device, maybe needs to change? The device is very good and quality for a money. 5 stars to seller.