Originally Posted by sevenftr
I would like to know if Woots has the hum. I know I sent a PM to Mr. Gribbles and he said he had it to a small extent. I know the 805 is not for everyone and indeed I had to modify my cabinet to have it fit nicely but it is silent. I have cranked the volume and then paused everything - movies, live tv, etc. and there is just no hum or hiss or anything.
Thanks again to Woots for all his hard work. I have continued to visit despiter my move to the 805 because I am concerned about how widespread the hum issue really is. It absolutely takes away from the sound quality because even though at loud volumes you do not hear it, when a scene goes quiet (like in Spiderman 2 when he stops the car in midair to save some people on the street) the 805 is silent while the 705 is noisy.
I have NO hum even at extremely loud volumes. I have attempted to replicate the "hiss and hum" situation by going to a dead source signal and cranking volume up to 100%. From 90-100% I started to get a slight hiss but I NEVER run my speakers from 90-100% and even though I heard a hiss it was faint at 100%. ALL receivers hiss at max volume you amplifying all noise in the path. Every solder point, every time you plug in a wire to connect something all of this adds more resistance and is going to give you your hiss.
I also have ZERO hum even at 100% volume. I have long suspected that this hum on the sub may be a combination of incorrect sub settings coupled with Auyessey. However, since I do not have the problem I cant diagnose it. I would advise people who have it try to be as objective as possible and approach the problem like an engineer. Remove ALL possible problems from the equation and then slowly add back components 1 at a time. You can isolate the root of the issue like this.
Having to run the speakers at max volume usually indicates one of 3 things.
Your hearing is starting to fail (I'm joking, but serious at same time
your speakers are being underpowered by this amplifier (time to look at an external amp or a bigger receiver)
Or your room is too big for either your 705 or current speaker size setup (or both).
For me the 705 is plenty loud I never go over 70-75%... At that level I cant carry on conversation with people in the room and the bass vibrates my chair)
There is one 4th reason to play volume loud. There are those who prefer to drown in super extreme volume levels (i used to build car stereo setups as a kid, I used to be like this, I stopped for the sake of my hearing) I can EASILY tell you now, those people the 705 inst the right choice of amplifier for you. You are going to want to get the biggest, cleanest amp you can barely afford and speakers to match (500-1000 watt range). If you want extreme volumes and clarity, your budget needs to be extreme too, 705 represents mid range bordering on audiophile class category, with focus on being affordable.
Having said that, I can get some insanely loud and clear volume levels even on this 705 setup. There is a difference though between extreme and this... when you can feel your rib cage and internal bodily juices start to vibrate in chest cavity.. then your starting to talk extreme SPL!
(thats the difference I am speaking of here) For those of you who been around 120-150+ SPL speaker setups you will know exactly what I am talking about here. (I am not exaggerating) I wanted to preserve my hearing as I decay in my old age, so 705 is way loud and still keeps me totally in the zone of whatever I am watching (at 70-75% volume)
Simple answer is No i don't have a hiss or a hum. I love this amp and this setup for this current room.