Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: Hi all,can anyone tell me how good Bluetooth sounds through this amp.....thanks.
Document: So chances are you will need to do this again at some stage.I've only used the with Bluetooth with aptX. Many older smartphones don't support this. Not sure what the Bluetooth without aptX sounds like. Presume it works but haven't tested it. Worth checking first.In summary: The D3020 is a superb and discrete amp for managing most audio requirements for the modern home. Despite it's small size it packs a big punch and looks great at the same time. Highly recommended.
When playing playlists, this does not happen, so I wonder if it is the iPhone or the amp.In short: for $500 + a nice pair of speakers (floorstanding or bookshelf), you have a hybrid hi fi audio system that will sound as good as several thousand dollars worth of gear.
This is a great amp, and the sound is perfect (loud or silent) with no hiss (unlike the Grace Digital that it replaced). It looks cool and the form factor is great for fitting on a busy desk. But the remote control looks as cool (a black slab) as it is useless - you can't tell what button does what, unless you're really good at reading black letters on a black background.
2 x speakers from each output. From what I can tell this induced a sub 4 ohm load on the amp. Both the speakers and amp handled it very well. I noticed some clipping running Netflix through the Apple TV at moderate to high volume. Turning it down a little would make it go away immediately with still a good sound output through all 4 speakers.
While the onkyo is much larger than I'd like for an office environment, the speakers do sound great when fed lossless material through a solid DAC. So - I swapped out the Onkyo A/V receiver for the little NAD D 3020, and expected the same magic I heard in the boutique shot... and I was disappointed.The NAD D 3020 is a very capable unit - and sounds quite good.
Let me begin with the positives first,1. The Seller delivered on time and in good condition.2. Sound quality is very good. Excellent connectivity options. Bluetooth streaming is clear and smooth.The negatives,1. System became faulty within a day. The display lights up all/random icons. Volume has to be cranked up to -20 levels to get reasonable output from a computer speaker setup with Mini Maggies.Have to return it for an exchange.
When I opened the box, I must say I was a bit disappointed, as this amp is about as big as a Wii console, and how could a hi fi amp be so small, right? Pretty minimalistic in design as well, only one volume knob. Was I wrong. This is a fantastic -and revolutionary- product that competes in the big leagues -at a fraction of the cost.
I had a Roksan Kandy amp so I had a great sound but this guy fits  its nicely next to my desktop and I connected via USB so I sold my $350 HRT streamer and fired it up immediately noticing the punchy clean bass and it goes very loud even though they say its only  30w also blue tooth streaming sounds great this is the future of digital amps !
I'm using this with my main desktop pc; and connected to my Q Acoustics 2010 speakers(these are similar in specs to the Audioengine P4's). The sound is clean and the highs seem a little brighter than the NAD integrated amp I was using previously. Although that could also be the outboard Cambridge Audio DAC I was using with the integrated amp... Regardless, it sounds fine. My ears aren't that sensitive to electronics as long as it's decent equipment; speakers make a bigger difference.
Bluetooth is convenient but using my iphone, which does not use the aptx codec, this feature is more convenient than sonically pleasing.There are a lot of Chinese made digital/tripath amps out there at varying quality levels. This amp far surpasses those in quality, design and execution. Very happy.
Answer: I found it working pretty good. I have not used it intensively, may be 3-5 times, sound was same and teh connection did not break. I used it in 50 m2 room and I may say the 2x30 W was not giving high power as much as I expected. For smaller rooms, should not be an issue. I am very happy with NAD 3020 in general.