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    tone controls? yes - or no ?


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    tone controls? yes - or no ?

    Post by tubes4hifi on Sun Mar 30, 2014 4:03 pm

    hey, that was fun, let's answer another question that comes up almost everyday.
    Do you want tone controls? I don't know, you tell me!
    Do I recommend tone controls? NO! Do I use tone controls? YES! Confusing? YES!

    OK, so if you think you want tone controls, the answer is yes, you probably do want tone controls.
    I perfectly understand that not everyone has perfect ears, perfect speakers, perfect room setup.
    I understand there is probably more poorly recorded music, than music that is recorded perfectly!!

    So what you need to know is that tone controls will always compromise sound quality.
    This is because using a circuit with tone controls means you need to have a minimum of 3X as much gain as you do without them.
    A high quality tone control circuit needs 20db of gain to overcome the losses of tone controls.
    Tone controls work two ways, by cutting gain (usually thru filters which just filter those tones to ground) or in worst cases
    by using negative feedback to reduce gain on those tones.
    To boost bass and treble (more likely than reducing it) those extreme frequencies need more gain, more amplification, which can lead to more noise,
    worse signal to noise ratio, more distortion, and usually all the other frequencies (the critical midrange) are subjected to negative feedback.

    These are the things we deal with in order to make the music sound better to our own ears, using our own speakers, our own rooms, our own recordings.
    We do need tone controls to overcome all these short comings, but we have to accept that the compromises involved are not as bad as the results.
    Are they better? They can be, or maybe not, that again, is a subjective question that only you can answer for yourself.

    Oh, so maybe you'd like my OPINION, rather than the facts as presented above?
    Sure! Do I like tone controls? NO! Do I recommend tone controls? NO! Do I use tone controls? YES! Sometimes, but I only use them when needed,
    as necessary, and when I am prepared to accept all those limitations to overcome my own personal set of limitations involving my own ears, my own speakers,
    my own listening room, my own recordings, some of which are awful, some have no bass, some have way too much bass, some are tinny, some are hollow.

    Hey, here's an idea for you. Need more bass? Get a subwoofer, you can dial in as much boost as you want or need. And guess what,
    then you don't need a bass control on your preamp!!! You don't need extra gain, extra noise, poorer circuit design. What a concept!!!
    So . . . . need more treble? Gee, let's think about that for a moment. Maybe I could add an extra tweeter, a more efficient tweeter, one with it's own gain control. . . .

    Hey, here's an idea for you. Make sure your listening room is at least somewhat enhanced to actually sound better.
    Do some research, read some books, buy some room treatments.
    Go all in !!! Buy a digital DSP EQ system for $10,000 and have it shape and perfect everything to your ears and your room! Really??? No, I think NOT!!!

    The bottom line - music is for enjoyment, and that is subjective, so do your own thing!!!
    And MY recommendations? Get the very best speakers you can afford, get your room setup correctly, buy better music, and THEN,
    either buy an SP14 (and a PH16 for phono) or buy an SP9 with tone controls, and then . . . . enjoy the music!! Simple!!

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    Re: tone controls? yes - or no ?

    Post by peterh on Sun Mar 30, 2014 4:24 pm

    Good post but ..
    it's seldom an issue of permanently adding bass or treble, it's an issue that some recording lacks ( or has too much) of something.
    It's not me room or my equiplment, it's my habit of enjoying records even if the recording engeneer smoked funny stuff or just had a bad day. Even then i would like the music to be "as good as possible".

    The discussion however might lead to something positive, a preamp might be like pas-4, with no built-in tonecontrols but with a loop for a tonecontrol that could be engaged at will.

    This would open up a market for "tonecontrol-units" that adds less "bad-sound" then eq-boxes.


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    Re: tone controls? yes - or no ?

    Post by sKiZo on Sun Mar 30, 2014 5:33 pm

    I use dynamic expansion. low bass synthesis, holographic imaging, hardware peq, speaker compensation, impulse correlation, rephasing,  software convolution, R128 loudness, etc ... but I don't use tone controls.

    Not sure if that's a yes or a no, but it's a definite maybe ... yeah ... definite!  jocolor

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    Re: tone controls? yes - or no ?

    Post by corndog71 on Sun Mar 30, 2014 9:52 pm

    No tone controls for me. Mine goes source-> preamp -> amp -> speakers. I got great speakers and room treatments. All I need. Well, that and great music.

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    Re: tone controls? yes - or no ?

    Post by daveshel on Mon Mar 31, 2014 12:55 am

    I gave them up many years ago. My solid state preamp has defeatable tone controls and I haven't engaged them for years. My tube preamp doesn't have any. Except for the rare instance of playing a bad or old recording (which has yet to come up), I feel like I'd only need them if I didn't do my job correctly at some other point in the process - bad choice of gear, bad setup, bad acoustics.


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    Re: tone controls? yes - or no ?

    Post by audiobill on Mon Mar 31, 2014 5:26 am

    I try to avoid listening to any bad recordings, except for possibly early jazz guitar, which I play (badly!).

    So don't want the comprises that go with tone controls. OTOH, I do like a remote balance control for fine tuning imaging from my listening position.

    I'd like to see a remote option on the VTA preamps....the only thing they're lacking, IMO.

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    Re: tone controls? yes - or no ?

    Post by deluxmon on Mon Mar 31, 2014 9:49 pm

    tubes4hifi wrote:
    The bottom line - music is for enjoyment, and that is subjective, so do your own thing!!!
    And MY recommendations?   Get the very best speakers you can afford, get your room setup correctly, buy better music, and THEN,
    either buy an SP14 (and a PH16 for phono) or buy an SP9 with tone controls, and then . . . . enjoy the music!!   Simple!!

    That is it in a nutshell.....get the best speakers you can afford - ABSOLUTELY! buy better music - check out PONO....It will change how we hear music moving

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    Re: tone controls? yes - or no ?

    Post by Brap on Wed Apr 23, 2014 2:57 pm

    Just a "teensy" bit with my Parasound Halo for the Paradigm Studio 10V5's for the low end versus connecting a sub.............for now! ST-70 is the amp.


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    Re: tone controls? yes - or no ?

    Post by MattR on Thu May 22, 2014 11:22 pm

    I definitely want tone controls. I use them very sparingly, but I always like to have the option if I want it. I suppose my ear isn't as well defined as some "audiophiles" who look at tone controls as some kind of mortal sin. On my own pre-amp, I can't hear any difference with the tone switch defeated or activated (with the tone controls flat). Some say even having the defeatable switch puts an unnecessary step in the audio circuitry that will lesson the audio quality, but I don't care. I need the freedom to adjust the tone during those few occasions when I just need more bass or a bit brighter sound.


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    Re: tone controls? yes - or no ?

    Post by audiobill on Fri May 23, 2014 6:22 am

    Of course, equalizers introduce new issues, but may help with your challenge without redesigning components.....
    mark four

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    Re: tone controls? yes - or no ?

    Post by mark four on Sun May 25, 2014 9:01 pm

    tone controls are removed from my pas3 . i  like the clean sound of no tone controls .


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    Re: tone controls? yes - or no ?

    Post by MexicoMike on Sat Nov 22, 2014 9:41 am

    Many years ago I was of the "no tone control" camp. But I finally realized that a lot of records and CDs that I listened to sounded like cr@p. I belonged to that school of "listen to it as the producer/engineer INTENDED it." But I came to the conclusion that some of them apparently couldn't hear very well! Smile

    So now I use tone controls regularly. I have records/CDs that I need to cut the bass, some that I need to cut the treble, and some that the controls stay flat. But not having the ability to make an adjustment is just not workable for me any more.

    I once equalized my system for my seating position to obtain flat response to ensure (in my view) that I got EXACTLY whatever the recording engineer "intended." It was the worst sound I have ever heard and it would send me running from the room. Of course, that's a totally ridiculous concept because sound doesn't work that way. A violin from a foot away doesn't sound the same 30 feet away. Basically, a flat response at the listening position meant a hugely boosted high end.

    If it sounds bad then it's bad. IMO tone controls can make listening to many sources pleasant instead of Unpleasant.

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    Tone control alternative

    Post by deepee99 on Wed Sep 09, 2015 9:26 am

    Bob Carver (at the time Audio Control) made a sweet little 5-band powered EQ back in the 1980s you could take completely off-line. Later versions of the Model 520 had a switchable and very unobtrusive rumble filter as well. Pots were rotary, not slide, and frequency adjustments were a very handy 35, 50, 120 Hz, and at 1kHz and 15.5 kHz. Had a tape/mon front-panel switch as well if that's how you wanted to set it up.
    Here's a pic of one:
    I used one for many years to perk up my Dahlquist DQ-20i speakers and still use one with my sand amp/Dynaco A-35 set-up.
    I have a spare and if somebody would like to "borrow" it for a month or two for the price of postage both directions - it's neither very heavy nor very large, you're welcome to it. Or you can find one now and then on AudioGon or Fleabay in the $50-$90 range. A cheap way to test the waters. PM if interested.

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    Re: tone controls? yes - or no ?

    Post by Dave_in_Va on Sat Sep 12, 2015 7:23 pm

    Well, I took Dave's advice and actually bought the one one he referenced on eBay.
    Just hooked it up and it works fine (no scratchy pots!). It's the kind of thing I'd only use about 5% of the time. On some ancient mono singles mixes (Byrds, Beatles) I would occasionally need to kill a little of the bass because
    1. I drank a six pack and turned it up too loud.
    2. My room is actually too small to be cranking this thing on singles mixes.
    3. I didn't need to get into the world of room treatments.
    Minor problem solved for $67. Thanks Dave!
    And thanks to the forum for all of the great info. AND thanks for the great VTA gear!!


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    Re: tone controls? yes - or no ?

    Post by Dogstar on Thu Apr 05, 2018 6:52 am

    Slightly off topic but since you were suggesting using your preamps as a compliment to 'our' sound systems I have a multi-part question regarding other 'preamps' as well as yours. And I'm not an electronics guy and I don't understand what different types circuits do or why one is better than the other so my questions may be off base. A while ago another forum member, if I remember correctly, posted something about about how you built a preamp for him using a Glassware Tube Buffer for him rather than your own preamp designs. The reason I recognized that was because a friend built a Tube Buffer using the same exact board for me. So can you tell us what the differences between your preamps and the tube buffer and how they improve or alter the sound? And for that matter what do the differences between the preamps you sell do? And what is it that makes one board a preamp and another one a tube buffer? I have other questions but I do have leave for work. Thanks in advance.

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    Join date : 2008-11-30

    Re: tone controls? yes - or no ?

    Post by tubes4hifi on Sat Apr 21, 2018 1:58 pm

    Hi DogStar,
    I just got back from a 3 week vacation, so sorry for the delayed reply.
    Seems you are asking me about tube preamps, what's the difference between a preamp and a buffer, etc.
    A buffer has ZERO amplification, it takes the signal and changes the impedance between input and output so that it can drive an amplifier without suffering degradation due to impedance mismatch,
    which can cause loss of especially lower frequencies, but could also affect the midrange, and of course a tube buffer has the ability to change the tonal balance slightly because it usually has
    higher odd order harmonics which seems to "enhance" the sound quality. A preamp does all this but also has GAIN, usually around 12db or 4X gain of the original signal.
    What do I do different than Glassware? #1 is I use a tube power supply, as this makes a noticeable improvement in the sound quality.
    Tube rectifiers are slow, and don't usually pass hash and noise that solid-state diodes do. It also gives the tube circuit a slow/soft start-up and shut-down,
    otherwise you would get pops and glitches during turn-on/turn-off, requiring a circuit usually using a relay to ground the signal for 20-30 seconds.

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    Re: tone controls? yes - or no ?

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