Newbie question: Amplifiers, Volume, Clipping?


I've just got my first proper stereo. It's a bit of a mixed bag of used gear and the speakers + amp aren't ideally matched. I'm continually concerned about blowing something by turning it up too much. The issue isn't too much amp power, it's too little, which I've heard is more dangerous. I need to know what I should be listening for as far as signs of clipping and how high I can turn my volume dial to be safe (noon? 3 o'clock?)

The pieces:
Xindac integrated tube amplifier. 40 Watts Pentode, 18 Watts Triode. (I've been too worried to try 18Watt Triode...)

Old Celestion Ditton 442s. "Amplifier requirements" are 20-120 watts and sensitivity is: "2.9 Watts of pink noise input produces 90dB SPL at one meter...".

Grateful for advice!
fakr
Almarg, while admittedly I flunked high school physics and can't always grasp your technical discourse, I always enjoy you're posts--they're unfailingly polite, patient, positive and informative. Thank you for being you.
If 96db avg levels are not sufficient ... either get another amp... or more eff speakers!

Why wonder about where you can break them with the volume knob?

Usually, soft clipping in tube amps sounds like fuzzy audio... distortion in other words, but the clarity of the audio begins to vanish and becomes less distinct. Vague. Soft & fuzzy!

The only other item I can figure out here is that the speakers may be fairly eff, but their imp curves are not quite so friendly.

AS OP said already, these items are not a super great match. Well, then... figure out which is the better item, amp or speakers and keep that. Sell the others.

Or .... get OK with listening at lesser SPLs.

Personally, I"ve never twisted the vol dial above 2 o'clock since I turned 17... and blew my first speaker. Ordinarily, if I have to get above the noon mark on my preamp for pretty good levels, I might have a poor match on my hands and I'm figuring something ain't right already.

the days of twisting that knob all the way over are gone for me. I simply will not do it!

Very good luck developing your outfit.
Loomis, thanks very much! I always find your posts to be informative and enjoyable, as well.

Best regards,
-- Al
Blindjim, I'm with you. Tonight I was listening to an old record that I've owned for 35+ years, George Solti conducting Chicago Symph. Orchestra, Beethoven 9th (London ffrr LP), 4th movement. As is often the case with classical music, Beethoven's 9th, especially the 4th movement, is very dynamic with large swings in SPL. When the full chorus and orchestra were going full tilt, the SPL caused my ears to literally distort. All I could hear was a buzzing sound even though I knew the music was clear as a bell.

So my point is that while you are concerned about turning the gain up too high out of concern for blowing your speakers, I am concerned about blowing my ear drums. Although . . . to actually have been there to hear the 9th live with the chorus and orchestra going full tilt must have been one he*l of an experience. I'll just know to bring ear plugs if I can catch the 9th live now.