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How to Know if You Are Not Getting Enough Power to Your Amp

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Knowing when an amp isn't providing enough power

I recently posted most matching an amp with some B&West Nautilus 804s (rated at 8 Ohms, but with min impedance 3 Ohms), and ended upward getting a Denon AVR-X3200W (105 WPC at eight Ohms; 135 WPC at half dozen Ohms, two ch driven). The speakers feel a petty calorie-free on low frequencies to me - for example, the deep bass that kicks in effectually 0:47 in this track is barely audible:
https://www.youtube.com/spotter?v=qSXzMrcpAks

How likely is it that the amp is struggling to power the speakers? I can dial upward the graphic EQ settings and get more than plenty bass, but the transmission also says that the speakers should ideally be paired with an amp that provides twice the wattage at 4 Ohms than at viii Ohms, which I'm not sure this one does.

Does it audio like this speaker/amp combination is OK? Apologies if this is a noob question, only would appreciate your help!

Re: Knowing when an amp isn't providing enough power

Answer #i –
If the amp isn't distorting, it's probably not an effect.

Consider acquiring a measurement mic + software so you lot tin run into what'south happening to the frequency response of those speakers in your room: It's a lot cheaper than buying a new amp, and more than effective too.

Re: Knowing when an amp isn't providing enough power

Reply #2 –
At normal listening levels an amp is supplying a tiny fraction of its full power, and so unless your neighbors were calling the cops, the amplifier was not limiting the bass.

Re: Knowing when an amp isn't providing enough power

Reply #three –
I can dial up the graphic EQ settings and go more than enough bass
Here is your starting time clue that your amp is admittedly, positively, not the problem.

Re: Knowing when an amp isn't providing enough power

Reply #4 –
Wow, those speakers better come with marital favors at that price. I would venture to advise y'all've spent a lot of money on mediocre speakers. Looking at the specs I walk away underwhelmed. Oooh, a kevlar speaker cone. I accept a professional person bass cab with 8 of those and that cab make new cost ane quarter what those do.

Does the amp audio fine with another reasonable pair of speakers? I seriously uncertainty this is a power issue unless the power amp is faulty and, as Greynol suggested, if y'all can EQ it to audio OK then it'southward not the power amp.  Either in that location is a problem in the preamp or DSP department (config?) of the AVR, the speakers aren't very well designed, or it's the room acoustics.

Re: Knowing when an amp isn't providing enough power

Reply #5 –
...or he doesn't sympathise that the ear is insensitive to bass at low output levels.

Re: Knowing when an amp isn't providing plenty power

Reply #6 –
I'thousand going to guess you, OP:
A) Don't use a sub and
B) are using the receiver in Pure Direct mode.  [no Audyssey].

"Considering my big speakers don't demand those things."

Both of these, A and B, are mistakes. Also when you do go a sub you lot are probably going to exist inclined to prepare the output for the front speakers to "large" instead of "minor". That'southward also a mistake, notwithstanding a very understandable i. This very poor wording the receiver uses really should be "Do you want to apply bass management so I tin redirect the depression bass to your sub(s), optimally placed for bass response rather than simply soundstage direction , using a defended aqueduct I focus 8X the resources towards to adjust?"

Re: Knowing when an amp isn't providing enough power

Reply #7 –
Annotation the woofers in these"big speakers" are 165mm, roughly 6.5 inches.

Re: Knowing when an amp isn't providing enough power

Answer #8 –
The speakers experience a little light on low frequencies to me - for example, the deep bass that kicks in effectually 0:47 in this runway is barely audible:
What other amp did yous use, where the same speakers, in the aforementioned position, in the same room, at equal volume, didn't audio a little light on that rails?

Re: Knowing when an amp isn't providing enough power

Answer #10 –
BTW, I played that clip terminal dark at a reasonable volume on a 90W per channel AVR in directly fashion driving a pair of $150 KLH 3 style floor speakers (12", 4" and tweeter). It made the walls rattle.

Re: Knowing when an amp isn't providing enough power

Reply #eleven –
12"
...and the room can brand all the difference for a track that has deep bass and essentially goose egg mid bass.  That track has very silly instrumentation (if y'all tin call it that) and mixing, IMO.  You tin can sub the discussion gimmicky if yous find silly too offensive.

Fear over wattage, blind reverence to "upper-mid-tier" models, and/or non-elite name brands aren't going to help matters.  The same might exist said regarding fear over minimum impedance requirements (the speaker drops below 4 ohms, OMG!), depending on the usage. Too much money was likely spent on this organization as it is.

Sorry to pile on, I'm just annoyed that the OP didn't go (or heed) rational advice before spending his coin.

Thankfully no i is blaming youtube compression for the apparent lack of bass. ;)

Re: Knowing when an amp isn't providing enough ability

Reply #12 –
Earlier y'all 'piled on', greynol, you might have asked yourself how much I paid for those speakers, and indeed whether I paid anything at all.

As for getting (or heeding) advice, that'due south exactly what I'm trying to do by posting on this forum.

The questions may exist naive, and I don't mind being reminded of my ignorance in a constructive way. Simply I'm not sure what I've done to warrant ad hominem references to 'blind reverence', 'contemporary songs', 'OMG', etc.

I sincerely hope you don't treat people like that outside of Cyberspace forums.

Re: Knowing when an amp isn't providing enough power

Reply #xiii –
I take been and so negatively seasoned past fright based threads, that have undoubtedly been fueled past $$$-driven placebo-based nonsense that I've grown completely calloused to the whole matter.

AFAIC, save for a tiny and perpetually dwindling fraction, the audiophile community is a complete joke.

I'1000 far more annoyed at what I imagine led y'all to this point than I am at your initial question, I assure y'all.

Re: Knowing when an amp isn't providing plenty power

Reply #14 –
To put it another style, you can have all the current in the world, simply without voltage y'all have no watts.

Low impedance speakers and headphones lean toward needing more current, while high impedance speakers and headphones lean toward needing more than voltage. Information technology'south a matter of matching the characteristics of the amplifier to the characteristics of the speaker/headphone, i.eastward. matching their impedances for greatest efficiency.

Re: Knowing when an amp isn't providing enough power

Reply #15 –
Most people don't know how much wattage they even need. Some erroneously assume more than than they need will e'er be better.

Re: Knowing when an amp isn't providing enough ability

Reply #16 –
Although they weren't terribly accurate, in that location was a time in sound when power output meters were so common in stereo receivers that some brands even had them on their entry level units. As I understand it, this photo shows how Pioneer's SX line-upward, c. 1979,  had them on every single model, at to the lowest degree in this pic, even the baby!

I suspect the manufacturers at one point realized keeping people in the dark was to their advantage and that marketing inconsequential ability gains, like 100 westward/ch vs. 120  w/ch was the better fashion to go, hence power meters pretty much disappeared from the scene.

New topic. Since it seems born to the new forum's software, and I use this exact method to post images in other forums without any objection, I assume it is O.K.. If not, I'll be glad to modify the post.

Re: Knowing when an amp isn't providing enough power

Reply #xviii –
Amp clipping is quite audible. It will apparently sound like crap : distortion, loss of dynamics. Also, if y'all're daft enough to continue turning the volume upwardly, you'll notice the volume isn't getting any louder.
If you ever turn the volume up enough to encounter clipping, you've got to plow it downwards fast as the amp will start outputting signals closer to a square wave than a sin moving ridge (ie : music), and that tin severely impairment your speakers, beginning by your tweeters. Only you lot'd take to plow up the volume pretty high to be able to hear that on almost decent quality regular consumer amps, frankly. I would probably flee the room before reaching that point.

Re: Knowing when an amp isn't providing enough power

Reply #19 –
In an average room with sensitive speakers, playing music with an even frequency response, just one watt is quite loud.

Re: Knowing when an amp isn't providing plenty power

Respond #twenty –
Perchance others could hear the same vocal that you've linked to. Have yous tried it on another setup?

Re: Knowing when an amp isn't providing plenty power

Answer #21 –
If you have admission to a good AC volt meter then you lot can mensurate either the average or the RMS voltage out of the amplifier during the loudest parts of a song. Carve up the square of this voltage by the impedance of your speakers to become a value in watts. If this value is more than ane sixth of the rated output power of your amplifier then you are probably clipping.

Re: Knowing when an amp isn't providing plenty power

Reply #22 –
If you have admission to a good Air-conditioning volt meter and then you tin can measure either the average or the RMS voltage out of the amplifier during the loudest parts of a song. Dissever the square of this voltage by the impedance of your speakers to get a value in watts. If this value is more than than one 6th of the rated output power of your amplifier then y'all are probably clipping.

why one sixth?

Re: Knowing when an amp isn't providing enough power

Reply #23 –
Six to ane is the typical crest factor for audio.

holmesstanter.blogspot.com

Source: https://hydrogenaud.io/index.php?topic=111154.0

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