Originally Posted by adidino
They are not powered. It's just concerning to me that that such a highly regarded home cinema solution is noisy. Just shouldnt be the case. Maybe it is the speakers but that's a serious flaw in my opinion.
You're trying to make this easier than it is. It's a question of prioritizing. My room is so small that the maximum output of the One Array system will ruin my hearing and probably cause my ears to bleed. I will never use the extreme upper range, so I opt to attenuate in order to get less hiss traded for potentially more distorsion in the extreme upper range. JBL decided to optimize contrary to this and chose to have the best possible sound in the extreme end while accepting a bit off hiss.
In all honesty, during movies the projector background noise drowns the hiss to the point that I really have to listen for it. During movies it is simply not an issue! However, this is not the case when listening to music with the projector off alone in a very quiet room...
Let me give you the exact answer Harman gave me regarding the hiss I experienced:
"This is directly related to the gain structure of the SDEC to the amps (and to some degree the preamp). We do have some noise reduction happening in the SDEC to reduce this when no audio is playing. You can use attenuators on the output of the SDEC, and we have used the STP-1 from RDL Labs for this with good results, but at some point you are giving up internal digital resolution and headroom, and risking overloading the digital filters/DSP during normal listening for an improvement in noise floor when there is no audio or the system is not making sound. Of course the system should always be on and making sound.
In most rooms, the noise of the system is just at the noise floor of the room, and only in the truly exceptional, quiet rooms do you hear a hiss. It should also be clear that once any audio is playing the hiss is completely masked and the benefit is that we can play with much higher headroom and output than any other way possible.
The company suggestion is to play the system at a normal level without adjusting the gain for hiss and see if you can still hear it. You most likely cannot. We also do not suggest sticking your ear in any speaker while a movie is playing as this will cause hearing damage and is an unrealistic test of a noise floor.
In short, in some installations, there can be a very low hiss from the SDEC, but for most rooms you cannot hear it under normal listening conditions, with the benefit being higher output and lower distortion both in the analog and digital sections. We feel the benefits are worth it."
I was happy with this response, except that it would have been nice if they had specified eactly what "at some point" means for the specific Synthesis amps I'm using. My calculations say that 12dB attenuation is OK with the Synthesis amps, but I did not get that confirmed. It is clear that a detailed corrent answer will depend on what amps/subs are used in the setup.
In any case, my system now works PERFECTLY with the attenuation implemented. Why is it so hard to accept that Synthesis may need a bit of tweaking??? I'm a happy customer that spent a lot of cash and despite a few minor issues I got everything set up perfectly. Yet you guys are angry birds with nothing at stake... Edited by Peter Nielsen - 1/31/13 at 5:14pm