Just starts to sound crappy, unclear and watch out for blowing tweeters. Could you explain this in more detail? So there's no distortion at high volumes or bass notes?
I have Tetra s. Clearly, they wanted more power. Seems like I am pretty confirmed that the scratchy breaking up I hear on swells is clipping. If you are hearing distortion when the "music swells" and you are not playing at high volume, it could be that you are over-driving some other part of your audio chain. For example, if you have a DAC with a high maximum output level that is feeding a preamp that has a low maximum input signal, this could cause the distortion you are getting.
Also, if you are doing any kind of equalization such as boosting bass or treble, or room correction, this may be causing clipping of the DAC or preamp depending on where it is done. Clipping happens only at max output. So if it is not high volume then it is not clipping. If it happens when the music swells, that is a high amplitude signal in the source regardless of the amount of amplification.
So this could be as simple as a dirty stylus and mistracking. Or overloading an input somewhere. Could be a lot of things. Without knowing more, pure guesswork. If you don't hear this at high volume it isn't the amps clipping. Could you describe what is meant by 'when the music swells'? Does this occur on all inputs? It sounds like distortion with any source that gets worse as you turn up the volume knob rather than things getting louder.
It would be interesting to know if it occurs from a specific selected or all source inputs to the preamp. If you play your system loud, it doesn't take long to eat up 60 watts. If you turn your system down, does it get better? Something else then that would have to be isolated by testing one change at a time. Try it on the 4R tap if you've been running it on the 8R so far Absolutely no idea what is going on here.
Except for one thing: "when the music swells". When the music swells is called a crescendo. If you hear breakup or distortion it is a lack of power for your speakers and your room you would be surprised how much power mot speakers take to achieve an above normal listening level that is why there are high sensitivity high impedance large loudspeakers that achieve those above natural levels with 1 to 5 watts in most rooms.
I'm certainly not a tube amplifier expert, but with all tube products I have dealt with, "if something is not right" Check or replace the tubes FIRST. I assume your tube preamp is older than the power amp? Start with that. See if you can swap out an entire component, preamp, then power amp to isolate problem.
I think it is mistracking. Miyajima Shalabi wt Triplanar arm. Waiting on a Lyra Atlas SL. Hope that is better. Also distortion on new LPs so not just old, worn record sound. I have blown a few cheap speakers with clipping in the past :- In my case, it sounded like a small hammer hitting the insides of the speaker enclosure, very very quickly followed by tweeter failures.
It may obviously be different for other speakers. Is this at the beginning, middle or end of record, or is it evenly across the entire side? I think it is mistracking No kidding. What I said. Ralph was also on the right track. Question now is, Why? Are we certain we are tracking at the correct VTF? Sounds like a worn out stylus if it's just with vinyl. Ok, you didn't provide much information such as how old your components are, how many hours on the tubes, how old is the cartridge, was it set up properly, etc.
If this is a new and unchanging occurrence, I agree that mis-tracking is the most probable cause and a great place to start looking. The easiest way is to simply try another source and see if you still get the noise.
There were not watching the bit meter and ran out of bits. It sounds just like you describe. Analog clipping sounds quite different. You can see a bit meter in this picture. The bit meter is in the bottom right corner of the right screen. I don't think I'm alone in wondering about clipping and compression and bad recordings. I'm certainly not worried about clipping my amps or speaker setup-all are pretty robust units. Wouldn't digital clipping be part of the badly recorded, compressed music we talk about so much here?
MDS Audioholic Spartan. Digital clipping as being discussed here is N consecutive max value samples in a row and results in a squaring off of the tops of the waveform. The process of analog to digital conversion essentially assigns a value between the min and max to represent the amplitude of the audio at each point in time how many points in time is the sampling frequency, like If the record level is too high, the resulting value would be greater than the max allowed and it therefore gets 'clipped' to the max.
Small sections of clipped peaks are generally inaudible but lots of them spaced closely together can result in the grainy type of sound. If the highs are clipped it can sound sibilant pronounced 'S' sounds and if the lows are clipped it can sound like a thud. Dynamic compression that everyone complains about can cause clipping just as clipping can occur during the intial recording with too high of a record level. Dynamic compression is not related to lossy or lossless compression which are data reduction techniques that make the file size smaller lossy compression discards some of the data while lossless does not.
I'm sure I can dig up a song or two with lots of clipped peaks and post a picture of the squared off waveform peaks. How good is good enough? Problems galore!
We seem to have a nice discussion here. I'm going to risk setting off further controversy, I hope without causing too much offense.
First of all FMW and MDS are absolutely correct about digital clipping and the differences between analog and digital compression. Lets go to first principles. Dynamic range compression means narrowing the decibel gap between the soft and loud passages in the program. On pop radio stations it is carried to the extreme, so that it is all loud. Dynamic range compression can be accomplished by both analog and digital devices.
They are called audio compressors. Now in the digital domain we have another form of compression, which in the lossy forms throws away parts of the program the authors of the codecs in question think we won't notice. Most codecs have degrees of compression that the creator of the file can choose.
Compression rates vary from chucking out nearly all the bits to just over half the bits. The purpose is to make the file smaller.
If it is audio to be streamed, to reduce the bandwidth. These codecs reduce the file size significantly, but not as much as the lossy ones. In my view none of the lossy codecs, even at their highest bit rates achieve anything approaching CD quality.
A CD plays back at a bit rate of They have the gall to call this near CD quality. Now a word about dynamic range and signal to noise. The CD has a theoretical range of about db or so. An example of this is the popular VLC software for playing music and movies on the computer. You can set your speakers to be very quiet and then turn up the volume in VLC extremely high and have clipping audio coming out of your speakers at very low volumes.
This is called gain staging and is how you stop clipping and make sure it never happens again. There's a big difference between gain vs. Otherwise I have the simple explanations below. So the first question is, what can we do once it's too late like this? This won't be relevant to anyone not involved in the music industry or setting up a church sound system, but you'll be happy to know that loudspeakers have protective circuits in them that cause the signal to 'soft clip' instead of 'hard limit.
Soft clipping takes that sharp plateau caused by clipping and rounds it off so that it takes a bit more of a smooth shape. This protects your speakers from overly unnatural movements that cause the tearing of the cones, but they can still suffer heat damage if the distortion is allowed to continue for prolonged amounts of time.
Your mixing console, digital audio workstation software , or amplifier has a 'limiter' on it that puts a preventative stop to peaking using dynamic range compression. You will still have clipping audio, but the voltage won't be higher than the acceptable limits. You just end up with horrible sounding audio. You can also use a compressor to reduce volumes without limiting, resulting in a more pleasant sound that helps defend you from clipping.
Professional studio engineers often use a compressor and a limiter just in case. You may be asking what is a compressor and what is a limiter , in which case those links have you covered. If you're listening to television, movies, video games, or professionally released music, the source levels of audio will be high but won't be so high as to cause sound clipping.
They will have normalization applied, turning them up in volume as much as possible without peaking. If you need more volume then you should turn up the volume at your speakers or headphones. The same goes for playing guitar or keyboards or recording with a microphone. If you're dealing with clipping in music, you should first turn down the gain at the instrument or preamplifier for the microphone.
This ensures you're not sending too hot of a signal to your amplifier or analog-to-digital converter. The point is to make sure your source audio itself isn't a hot signal that's peaking. Then you move to the next piece of equipment and make sure its volume knob isn't set too high. Follow this procedure all the way up through your receiver or amplifier and to your speakers.
This works for studio recording, music clipping at venues, home entertainment system receivers, car amplifiers, and anything else. Finally, typically with amplifiers usually in the automotive audio you can under-power or over-power your speakers. So try to make sure you're using speakers that are matched for your amp's power rating and vice versa.
You can also introduce distortion simply by turning your speakers up louder than they can handle. The basic cause of peaking is that somewhere along the line leading to your speakers or headphones, the audio signal has become too hot. You don't need to know the technical details or be an electrical engineer to understand the basics or to fix it, though we provide that info above, too.
Anything you need to know about audio clipping is here for you whenever you need it. Features Columns. What is Audio Clipping? Notice in this clipping waveform how the loudest peaks and troughs are literally clipped off and made flat. We actually have terms in the music industry for the three levels of distortion: Overdrive Distortion Fuzz All three levels are noticeable, but they're really obvious in the 2nd and 3rd levels.
Why Does Audio Clipping Occur? Sound On Sound created an image to show you the general equivalencies This gets confusing due to the three different scales used but we have to mention them to fully understand the topic.
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