- 38 Posts. Joined 3/2009
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The clicking is normal and in fact a good thing. Mechanical relays are by far the best choice. The click I am referring to is directly related to the amplifier self switching to the 4 ohm setting when put under load. In short this means this amp is not rated for 4 ohms it is at best rated for 6 and to be totally stable, and without fans 8. No amp should ever switch on its own to a 4 ohm setting as this changes your THD % significantly. In fact no amp should switch it's rail voltage at all. It is an abomination in the audio world. My issue is not with them amp/receiver so much as the company, portraying this amp as a 4 ohm spec'd unit when it most definitely is not. If you don't need to drive a 4 ohm load, and definitely not a 4 ohm or 6 ohm load with difficult phase angles in the lower frequencies it is excellent. So really if you don't need to drive anything cleanly other than a 8 ohm load. People don't want to admit they didn't get what they paid for so they will try and tell you in what ever way this amp is awesome this and awesome that but the simple fact regarding Onkyo and I'm sure other Mass market AV receivers is, it is not awesome as the spec sheet states it is, and is therefore, for all intention purposes kind of a scam. Hey I fell for it and I have been in audio for a while. Just never the mass market big box world of AV receivers.
I am confused by your question. Are you saying that your sub cannot handle a 75dB test tone? That would be very surprising. If the sub cannot play 75dB without distress then it is either faulty or useless. As HSU are a reputable manufacturer I would suspect the former.
You can turn down the sub gain control so that the Audyssey test reports a lower dB level, say 70dB, but all that will happen then is that Audyssey will set the sub trim higher when the calibration is complete. The point of an Audyssey calibration is to set the system to play at Reference Level if possible. Reference Level for the LFE channel is 115dB!
It is possible I may have misunderstood your question as I have never heard of a sub that cannot play 75dB. If so, please restate the question.
OK - got it. Changing the level that Audyssey asks for in the setup (75dB) won't help because Audyssey will simply set the trim to a value to compensate for it after calibration. All that the 75dB test is for is to establish a 'ballpark' setting for the gain on the sub prior to running the cal. The 'real' level will be set on the trims after Audyssey has run.
It sounds like you are just asking too much of the little sub and that upgrading to a better sub, as Arny suggests, is the way ahead. There is a physical limit on what an 8 inch sub can do.
This has been covered many times. See the Audyssey FAQ, here, for reasons why using 'full range' speakers set to Large is almost always a bad idea: