First of all, hi. I'm new on this forums as of today. I'm a 19 y/o student from the Netherlands. I study medicine and I'm really interested in Hi-Fi. I hope to have a great time on this forums.
So, now to the point of this thread. I currently own mostly speaker-based Hi-Fi;
Denon AVR-2113 receiver
Boston Acoustics A25 speakers x2
Boston Acoustics ASW650 subwoofer
Sennheiser HD280 Pro headphone
Sansa Clip+ 8gb + 32gb sdhc
Asus Xonar DGX soundcard in my pc
Recently I've started to use my headphones more and more. They're not that great, but they work. Since my PC stopped auto-switching to my headphones whenever I plug them in, I started using my receiver headphone jack. Also, I thought my HDMI receiver would have better SQ than my headphone jack directly from my PC. Now here's the problem: the HP output from my receiver leaks a humm: its not loud but audible when listening to music on a low volume. It's not a groundloop and it doesn't come from any of my sources. It also does this on all electrical outlets in my house. So it's defenitely a receiver problem. Also, the humm is monotome and the volume is constant; changing output volume does not influence the humm.
Is this normal with speaker receivers? Does this happen because my headphones are only 64Ω? Is there anything I can do about it? And if it's normal, should I upgrade to a headphone amplifier?
I'm into head-fi since some time and i'm planning to upgrade my headphones soon. Also, I really love headphone amplifiers. But if there is a workaround for this, it'd be great. I could wait some time and make a better decision on what to buy.
I'm still wondering whether I should buy a portable or desktop headphone amp, because I might buy a laptop soon. Using a portable AMP at home doesn't seem ideal, but buying both kind of exceeds my budget.
But first, I'd like your opinions/knowledge on the questions stated above.