Hi-fi has no shortage of rules that get repeated so often they eventually start sounding like facts, from the idea that more amplifier watts automatically mean better sound to claims that your new speakers need hundreds of hours before you can really hear what they can do.

Some of these beliefs have a grain of truth behind them. Others come from technologies that genuinely had limitations decades ago but have changed substantially since. And a few take a measurable technical difference and turn it into a much larger audible claim.

The point here isn't to tell you that you didn't hear what you heard, or to reduce audio to a spreadsheet of measurements. It's to separate the parts that can be explained by acoustics and engineering from assumptions that can send you toward upgrades you may not actually need.

Here are 10 of the most persistent hi-fi myths, what is really going on behind them, and what you should pay attention to instead.

1. Expensive Speaker Cables Always Sound Better

Speaker cables matter. Their price tag doesn't necessarily tell you how much.

That distinction tends to get lost whenever cable discussions start. A speaker cable is part of an electrical circuit, so its resistance, length, gauge, capacitance, and inductance aren't imaginary properties. Use a very thin cable over a long distance with a low-impedance speaker and you can introduce enough resistance to affect performance.

The important part is that these problems can be addressed without automatically moving into exotic cable territory.

Audioholics' speaker-wire guidance, for example, focuses primarily on resistance and recommends progressively thicker cable as runs become longer or speaker impedance becomes lower. Its guidelines suggest 16-AWG cable for relatively modest runs, with 14- or 12-AWG becoming more appropriate as distances increase.

Once a cable has sufficiently low resistance for the speaker, amplifier, and distance involved, however, spending dramatically more doesn't guarantee a corresponding improvement in sound. SoundGuys reaches a similar conclusion: analog cable properties are real, but price by itself is a poor indicator of audible performance.

Build quality can still be worth paying for. Good connectors, durable insulation, flexibility, reliable termination, and cable that's pleasant to route through your system all have value.

What actually matters: Buy cable with an appropriate gauge for the length of the run and the impedance of your speakers. After that, spend more because you value the construction, appearance, or convenience, not because a higher price guarantees a larger soundstage.

2. A More Powerful Amplifier Will Automatically Sound Better

A 200-watt amplifier sounds twice as impressive as a 100-watt amplifier on a spec sheet. Acoustically, the difference isn't nearly that dramatic.

Doubling amplifier power gives you roughly another 3dB of potential sound-pressure level, assuming the speaker can convert that additional power into output without running into its own limits. That means moving from 50 watts to 100 watts doesn't suddenly turn a modest system into one that plays twice as loud.

Speaker sensitivity can be just as important. A speaker that's 3dB more sensitive can theoretically reach the same output using about half the amplifier power. Listening distance, room size, speaker impedance, and how loudly you listen also influence how much power you really need.

None of this means amplifier power is irrelevant.

Extra headroom becomes valuable when music contains short dynamic peaks, when you're driving insensitive speakers, when impedance drops make the speaker a difficult load, or when you listen at high levels in a large room. An amplifier that clips during those peaks is a much bigger problem than simply having a lower number printed on the specification sheet.

But once an amplifier can comfortably drive your speakers to the levels you want without clipping or struggling with their impedance, adding another 100 watts does not automatically improve tonal balance, imaging, detail, or any other aspect of sound quality.

What actually matters: Look at speaker sensitivity and impedance, your listening distance, the size of your room, and how much clean headroom you need. Wattage is part of the equation, not a sound-quality score.

3. Vinyl Is Inherently Better Than Digital

This one can turn a friendly discussion about records into a small civil war surprisingly quickly.

There is absolutely nothing wrong with preferring vinyl. A good turntable playing a well-mastered record through a carefully set-up cartridge and phono stage can be a very enjoyable way to listen to music.

But preference and technical fidelity aren't the same thing.

Vinyl playback brings physical limitations that digital audio doesn't have to deal with in the same way. Records can introduce surface noise, rumble, tracking distortion, wear, and more limited channel separation. vinyl channel separation is typically around 30dB, while digital formats can exceed 90dB.

That doesn't tell us which one you'll enjoy more.

There's another complication: the vinyl and digital versions of the same album may not come from identical masters. Different EQ, compression, limiting, or mastering decisions can make one release legitimately sound better than another. In that situation, you aren't necessarily hearing the superiority of the format. You may be hearing a better master.

There's also the experience itself. Choosing a record, placing it on the platter, lowering the stylus, reading the sleeve, and listening to an entire side creates a different relationship with music than tapping a song on a phone. That's real. It just isn't proof that an analog groove is inherently a more accurate storage format.

What actually matters: Judge the recording and mastering rather than assuming the format determines the winner. You can prefer vinyl while still acknowledging that digital has significant technical advantages.

4. Hi-Res Audio Always Sounds Better Than CD Quality

It is easy to understand why 24-bit/192kHz sounds better than 16-bit/44.1kHz before you've heard either one. The numbers are much larger. The audible reality is more complicated.

One influential 2007 Audio Engineering Society study inserted a 16-bit/44.1kHz analog-to-digital and digital-to-analog stage into the playback chain of higher-resolution sources. Its participants (including recording engineers and audiophiles) were unable to reliably detect that CD-quality stage under normal-to-loud listening conditions.

But that isn't the end of the story.

A later AES meta-analysis examined 18 studies involving more than 400 participants and over 12,500 trials. It found a small but statistically significant ability to distinguish high-resolution audio from standard-resolution audio, with substantially stronger results when listeners had received extensive training.

So saying nobody can ever hear a difference would be another myth. The more useful conclusion is that high resolution doesn't guarantee better sound.

A 24/192 version made from a mediocre master doesn't automatically become superior to a carefully mastered 16/44.1 release. Recording quality, mastering, playback level, speakers or headphones, room acoustics, and the actual provenance of the file can all have much greater practical consequences.

Streaming services have made this especially easy to forget because a "Hi-Res" badge can look like a quality rating.It isn't. It describes characteristics of the digital format.

What actually matters: Look for good recordings and good masters first. Treat high-resolution availability as a potentially useful bonus rather than proof that one release must sound better.

5. Your New Speakers or Headphones Need Hundreds of Hours of Break-In

Few pieces of hi-fi advice require as much patience as being told not to judge a new product until it has played music for 100, 200, or even 500 hours.

The basic idea isn't completely invented. Mechanical components can change with use, and loudspeaker suspensions aren't perfectly rigid objects frozen in time.

The questionable part is the claim that consumer audio products routinely undergo huge sonic transformations after hundreds of hours.

Headphones provide a useful test case. RTINGS conducted a 120-hour break-in experiment using four different headphones, including dynamic, planar-magnetic, and balanced-armature designs. It monitored frequency response, phase, and harmonic distortion throughout the test. The changes it measured were either too small to be considered meaningfully audible, inconsistent, or attributable to factors such as pad softness and positioning. RTINGS concluded that its test found no evidence supporting the commonly claimed headphone burn-in effect.

There's another variable that's much harder to put on a measurement graph: you.

Human hearing adapts. A headphone that sounds unusually bright on Monday may feel much more normal two weeks later simply because you've become accustomed to its tonal balance. Pads can also soften, fit can change, and your positioning may become more consistent.

With speakers, some mechanical settling may occur, particularly early in their use, but that is different from assuming you should ignore your impressions for hundreds of hours because a completely different speaker is waiting to emerge.

What actually matters: Give yourself some time to become familiar with new equipment, but don't assume every problem will disappear after an arbitrary number of hours.

6. A Serious Stereo System Doesn't Need a Subwoofer

Subwoofers have spent decades being associated with explosions, action movies, rattling windows, and cars that announce their arrival three streets away.That makes it easy to assume a purist two-channel music system should avoid one.

A properly integrated subwoofer doesn't have to call attention to itself at all.

Its most obvious job is extending the system into frequencies that the main speakers cannot reproduce effectively. That's useful even when you aren't listening to bass-heavy electronic music. Pipe organ, orchestral recordings, drums, piano, acoustic bass, ambient recordings, and the sound of the recording space itself can all contain substantial low-frequency information.

There is another benefit. When bass management sends the deepest frequencies to a subwoofer, the main speakers no longer have to work as hard reproducing them.

Genelec explains that low-frequency reproduction requires large woofer movement and significant amplifier power. Moving that workload to a subwoofer can reduce excursion demands on the main speaker, improve linearity, and leave more output capability available above the crossover frequency.

A subwoofer also gives you something conventional floorstanding speakers don't: freedom to position the bass source separately from the main speakers. The locations that create the best stereo imaging aren't always the locations that produce the smoothest bass response in a particular room.

Of course, a poorly integrated subwoofer can sound awful. Too much level, the wrong crossover, incorrect phase, or bad placement can turn bass into an obvious disconnected thump. That's an integration problem, not proof that subwoofers don't belong in hi-fi.

What actually matters: A subwoofer should extend the system, not dominate it. Placement, crossover frequency, level, delay/phase, and room interaction matter much more than whether your music is supposedly "bass heavy."

7. Room Correction Can Fix a Bad Room

Modern room-correction systems can do things that would have seemed remarkably sophisticated in a home audio system not that long ago.

Dirac Live, Audyssey, ARC Genesis, Trinnov, Genelec GLM, and other systems can measure the interaction between your speakers and room and apply DSP to address substantial response and integration problems.

That doesn't make room acoustics optional.

Room correction is particularly useful for dealing with low-frequency peaks, tonal imbalance, speaker/subwoofer integration, level matching, and timing. What it cannot do is physically stop sound from bouncing off your walls, windows, floor, and ceiling.

Deep cancellation nulls are another problem. When direct and reflected sound arrive at the listening position out of phase, simply boosting that frequency with EQ may achieve very little. The additional direct energy can be met by additional reflected energy and cancel again, while your amplifier and speaker are being asked to work considerably harder.

DSP also cannot turn an excessively reverberant room into one with physically controlled decay in the same way absorption, diffusion, furniture, rugs, curtains, and other acoustic changes can.

And it cannot rescue fundamentally poor speaker positioning.

Move a speaker or listening seat a relatively small distance and the low-frequency response can change dramatically. Fixing placement before running calibration gives the correction system a better starting point and usually means it has less corrective work to do.

None of that is an argument against room correction. Quite the opposite: it's one of the most useful tools available in modern home audio. Just don't expect software to repeal acoustics.

What actually matters: Start with sensible speaker, subwoofer, and seating positions. Address obvious acoustic problems where practical. Then use room correction to refine the result rather than treating it as a rescue button.

8. Balanced XLR Always Sounds Better Than RCA

XLR connectors look serious. They're larger than RCA plugs, they lock into place, and they're standard equipment in recording studios and professional audio systems. It's easy to conclude that using XLR must also improve sound quality in a home system.

Balanced connections do have a genuine technical advantage: noise rejection.

A balanced connection carries the signal in a way that allows noise picked up along the cable to be rejected at the receiving end. This common-mode rejection makes balanced connections especially useful with long cable runs or in environments where hum and electromagnetic interference are concerns.

That doesn't mean a one-meter RCA cable connecting two properly designed components is inherently compromising the music. Unbalanced RCA connections work extremely well over short distances, which is one reason they remain common on high-end consumer audio equipment.

Implementation matters too. Having XLR sockets on the back of a component does not tell you everything about the circuitry behind them, and different equipment may also produce different output levels through RCA and XLR.

That last point can cause misleading comparisons. A slightly louder signal often sounds more impressive in an uncontrolled A/B test. Unless levels are accurately matched, it can be easy to attribute that difference to better detail or dynamics rather than a basic change in volume.

What actually matters: Use balanced connections when the equipment is designed to take advantage of them, particularly for long cable runs or when you're fighting noise. Don't assume replacing a short, quiet RCA connection with XLR automatically upgrades the sound.

9. Bi-Wiring Your Speakers Gives You Better Sound

Dual binding posts make bi-wiring look like an upgrade waiting to happen. Remove the metal jumpers, run two sets of speaker cable back to the same amplifier channel, and one pair of cables feeds the high-frequency section while the other feeds the low-frequency section.

The important detail is what hasn't changed: both cable runs are still connected to the same amplifier output.

That makes bi-wiring very different from bi-amping, where separate amplifier channels power different sections of the speaker. Active systems go further still by dividing frequencies before amplification.

The claimed benefits of simple bi-wiring are much harder to establish.

Dynaudio addressed the subject directly in 2023, saying that its own testing had not produced evidence of a performance improvement simply from bi-wiring. The company also noted that experimenting with different cables for the high- and low-frequency sections can alter the balance its designers originally intended.

That doesn't mean you're forbidden from experimenting. Hi-fi is a hobby, and trying configurations yourself is part of the fun.

But before buying twice as much speaker cable, it is worth understanding what the extra pair actually does and doesn't do.

What actually matters: Don't confuse bi-wiring with bi-amping. Two cables connected to the same amplifier channel do not suddenly give each section of your speaker its own independent amplification.

10. Class D Amplifiers Sound Worse Than Class A or Class AB

Class D has been fighting an old reputation for a long time. Some of that reputation has historical roots. Class D amplifiers switch their output devices at high frequencies and require designers to manage issues including switching noise, distortion, electromagnetic interference, feedback, and output filtering. Poor implementations can absolutely have measurable, and potentially audible, problems.

But "Class D" describes an amplifier architecture. It isn't a quality grade.

Modern designs can produce very high power from relatively compact chassis while wasting far less energy as heat than traditional approaches. More importantly, sophisticated feedback, modulation, filtering, and power-supply designs have addressed many of the weaknesses associated with older implementations.

Analog Devices' technical overview of Class D amplification notes both the engineering challenges and the ability of well-designed feedback systems to achieve excellent audio quality.

We've also reached the point where high-performance Class D isn't theoretical. Audioholics' measurements of products using modern Purifi amplification, for example, have placed them among some of the best-measuring amplifiers the publication has tested regardless of topology.

That doesn't make every Class D amplifier good. It also doesn't make every Class A or AB amplifier good.

Power supply, circuit design, noise, distortion, load dependency, current capability, protection circuitry, thermal behavior, and the way an amplifier interacts with the connected speaker all matter more than simply choosing your favorite letter.

What actually matters: Judge the amplifier, not the class printed in its specifications.

The Bigger Hi-Fi Myth: That One Specification Tells the Whole Story

There's a pattern running through almost every myth on this list.A real technical difference exists, and then we give that difference more importance than it deserves.

More amplifier power can be useful. Balanced connections reject noise. Higher-resolution formats contain more data. Speaker cables have electrical properties. Vinyl and digital do behave differently. Class D amplifiers have engineering challenges that Class AB designs don't share.

The mistake is turning any of those statements into a universal rule.

When you're building or upgrading a system, you're usually better served by focusing on the basics:

• Match your amplifier to the real requirements of your speakers and room.
• Spend time on speaker, subwoofer, and listening-position placement.
• Use appropriately sized, well-made cables without assuming price is a performance specification.
• Pay attention to recording and mastering quality, not just format badges.
• Use measurements, room correction, and acoustic treatment as complementary tools.
• Compare equipment at properly matched listening levels whenever possible.
• Most importantly, change something because you've identified a problem you want to solve—not simply because conventional hi-fi wisdom says the upgrade must be better.

Hi-fi gets more interesting when you understand why something works, not less.

And sometimes the cheapest upgrade isn't another component at all. It might be moving your speakers six inches, changing the crossover to your subwoofer, correcting a bad level match, or discovering that the piece of equipment you were planning to replace was already doing its job perfectly well.