9 Best Audio Equalizer | 31 Bands Or 5: Pick Your Fix

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Thirty-one bands of surgical control at the price most rivals charge for fifteen.

Here is a case where more really does cost less. Each channel carries a full 31-band design with an adjustable range of ±12dB per band, so you can move one narrow frequency without touching its neighbors. That is the whole point of high band count — a 15-band unit spreads its control wider, so pulling down a single offending resonance drags nearby tones with it. The EQ-231 lets you isolate. Owners repeatedly describe the band separation as clear, and one put it plainly: it works great, the range is adjustable, and each of the 31 bands lands exactly where you want it.

The flexibility extends to how you connect it. The unit accepts both XLR balanced and 1/4-inch TRS unbalanced inputs and outputs, so it slots into a live rig, a studio chain, or a home setup without adapter gymnastics. A LOW-CUT switch strips out wind noise, floor rumble and electrical hum below the music, and a BYPASS switch drops the EQ out of the signal path for instant A/B comparison. Four-segment LED ladders track gain reduction and output levels so you can see what the unit is doing.

The trade-offs are real but manageable. A few buyers report that sharing a power source with other gear introduces noise, and the standard fix is a ground isolator — after which the unit runs silent, with no hiss or buzz. One buyer received a dead unit, a rare arrival issue rather than a design flaw, and the color shipped is sometimes greener than the photos suggest. At a 4.2-star rating across 71 ratings it is not as battle-tested as the big brands, but the spec-per-dollar here is hard to argue with.

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Five bands, two glowing VU meters, and Bluetooth — a desk ornament that actually works.

The Douk Audio EQ5 Tone takes the opposite approach to the rack monsters. It gives you just five bands — 75Hz, 400Hz, 800Hz, 4KHz and 10KHz — but processes each one independently through its own op-amp, so the five sliders do clean, decisive work. For shaping midrange on bookshelf speakers or lifting muddy movie dialogue, five well-chosen bands are genuinely enough. It weighs 2.05 pounds, so it sits on a desk without complaint.

The dual 45mm VU meters are the signature feature, driven by a dedicated VU chip so the needles track the audio faithfully — and the new version adds background light plus pointer speed and gain adjustment. Bluetooth 5.0 lets you stream straight to the unit, which is unusual in this category and earns the “desktop favorite” title here. There is a bypass function that routes input to output untouched, and a balance control to keep the soundstage centered when your left and right channels are uneven. The all-metal case, aluminum knobs and gold-plated I/O round out a build that owners consistently call out as looking and feeling better than the price suggests.

Now the honest part. Sound quality is the most-discussed topic in the owner reviews, and it is genuinely split — some hear fantastic results, others report constant background noise that swapping RCA cables sometimes fixes. It is also worth knowing that this unit can develop channel or hum issues after extended use, so it rewards a little care. If you want a quiet, character-free signal chain, a balanced XLR unit beats this on noise floor. If you want five bands, wireless, and a VU meter glow on your desk, nothing else here comes close.

The five-band layout is tailor-made for radio hobbyists and voice work. As owners mention, the EQ5 paired with an Icom IC-8600 and a soundbar for shortwave: “5 bands ideal for voice, cleans muddy mids/harsh highs, adds warmth.”

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Thirty-one bands and a feedback finder that never lets you guess which slider to move.

This is the step up from the FBQ1502HD above: where that unit gives you 15 bands per channel, the FBQ3102HD doubles it to a full 31-band stereo layout, so you can notch a single frequency out of a mix without disturbing the tones around it. It also adds sweepable high and low-cut filters on each channel — adjustable filters that strip floor rumble, hiss and other unwanted low-end noise before they ever reach your amp. The FBQ Feedback Detection system carries over, revealing critical frequencies instantly and doubling as an audio analyzer.

Owners put it to work in every corner of a rig. It cleans up tinny computer output that an operating system’s own EQ could not fix, tames feedback in cover-band setups, and one buyer runs a 31.5Hz boost with an 8kHz reduction to smooth out a harsh upper midrange. The unit weighs 2 kg (about 4.4 lb) and measures 19.02 x 5.91 x 3.5 inches, so it drops into a rack alongside a mixer and a power amp. A dedicated mono subwoofer output with adjustable crossover frequency lets you drive a separate sub.

The faithful caveat is documentation — the box ships without printed instructions, so you will be tracking down the manual online. There is also a hardware reality worth knowing: the FBQ section is designed around a board-to-power-amp position, so if you try to run it as a direct line into a mixing board in front of effects, it does not behave the way you may expect. Used where it belongs, it is a solid 4.4-star performer, and the price is a fraction of what comparable rack gear often commands.

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Four knobs, one gain stage, and a bypass that disappears completely.

The Loki Mini+ ignores the slider-count arms race and goes for purity instead. It hands you four tone controls — 20Hz, 400Hz, 2kHz and 8kHz — with ±12dB of range at 20Hz and 8kHz and ±6dB at 400Hz and 2kHz. Inside, a single discrete current-feedback gain stage drives passive LC filters for three of those bands plus a gyrator for the bass, and the LC filtering is what keeps hiss exceptionally low. The point is not surgical correction but broad, musical seasoning.

It is designed to sit in a headphone or vinyl chain and quietly reshape warm lows. Customers note it tightening and powering up bass with no distortion and no signal loss, and one listener fixed a midrange dip in a pair of headphones so voices came through clearer and drums hit harder — for less than the cost of upgrading the headphones. The 100% passive bypass setting removes the EQ from the signal path entirely when you want the sound untouched. You also get deeper control over treble and bass specifically, which is what high-end listeners tend to want.

Two things a buyer should know. First, the power adapter is a USA unit intended for 115VAC wall voltage only, so it will not work in 230VAC countries without a converter. Second, the inductors inside can pick up hum from nearby electronics — if that happens, moving the unit away from other gear and trying a different source clears it. The knobs also have a fairly narrow sweep, so adjustments are gentle rather than dramatic, and the value proposition gets debated by owners given its compact 5 x 3.5 x 1.25-inch footprint. For a Schiit stack or a turntable chain, it is a 4.4-star specialist’s tool.

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Built-in pink noise turns room tuning into a ten-minute job instead of a guessing game.

The FBQ6200HD is a 31-band stereo graphic equalizer aimed squarely at live sound. Its standout tool is a pink-noise generator — a circuit that sends a test signal through your system so you can hear exactly how your room colors the sound, then cut the problem frequencies. Pair that with the FBQ Feedback Detection system, which reveals critical frequencies instantly and doubles as an audio analyzer, and you have a unit that diagnoses before it corrects. Dedicated limiters with gain reduction meters on each channel protect your speakers from overload and distortion.

Owners run it with PA systems and loudspeakers and describe the results as great sounding, with accurate controls, practical input intensity meters, and input filters that deliver excellent attenuation. The chassis is a 19.02 x 5.43 x 5.24-inch rack unit weighing 2.3 kg (about 5 lb), and it accepts XLR and 1/4-inch connections plus an XLR connector type. For catching feedback on a live stage, reviewers point out it works well. It is the most-reviewed Behringer in this roundup at 4.4 stars, with the brand’s reputation for value carrying over.

The honest wrinkle is reliability, which is genuinely mixed in the owner feedback — many run perfectly, while others eventually see slider lights fail. There is also a real usability quirk: the power switch sits on the back of the unit rather than the front, which owners find awkward for a rack-mounted piece you power on regularly. And one user found the connector setup did not match a particular stereo system without extra support. Judged as a live PA tool rather than a home hi-fi component, it still delivers an unusual amount of monitoring and testing capability for its tier.

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Thirty-one bands in a steel box that skips the frills and spends everything on sound.

The ART EQ355 is a dual-channel 31-band equalizer built with constant Q circuitry, which keeps each band’s shape steady as you boost or cut — so the frequency curve stays predictable instead of widening as you push a slider. It uses 20mm center-detent sliders, meaning each one clicks to a neutral center position so you can find flat quickly. A selectable boost/cut range of 6dB or 12dB lets you choose between gentle and aggressive correction. Balanced XLR and unbalanced RCA inputs and outputs cover both pro and consumer gear.

It is also heavy in the way serious audio gear tends to be: 7 pounds of all-steel chassis that fills 2U of rack space, with a ground lift switch, adjustable high-pass and low-pass filters, variable input level controls, signal clip indicators, and an internal power supply. Owners use it to correct room problems — one reports supplementing a room-correction system that was adding excess 2-5kHz energy, with the EQ355 taming that brightness while staying transparent and hum-free. Others boost the voice range for clearer movie dialogue and shape low and high bands to match their speaker specs.

The one thing to plan for is care with the controls and the environment. The adjustment knobs are a little delicate, so treat them gently. A couple of owners ran into ground hum even with the ground lift engaged, and shipping has occasionally arrived with a bent front plate — an arrival problem, not a design flaw, but worth inspecting on delivery. At 4.2 stars, this remains a respected pro-audio tool with a straight-wire bypass and a rugged build that serious hobbyists keep coming back to.

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Fifteen bands that stay phase-perfect — the trick is what you cannot hear.

Fifteen bands per channel does not sound like much next to 31, but the dbx 215s makes the case that band count is not everything. It uses dual 15-band, 1/3-octave constant Q frequency bands — third-octave spacing that lines up with how we hear. Owners with high-end systems report the strongest phase performance of any unit here: with balanced connections, the phase stays aligned at all frequencies, so imaging does not change whether the EQ is in or out of the chain. That is a rare quality — many equalizers shift the timing of sound slightly when engaged, smearing the stereo image.

The feature set is purposeful. Switchable boost and cut ranges of 6 or 12 dB let you pick your correction strength, a front-panel bypass switch handles instant A/B checks, and a 12 dB input gain range lets you match levels. Four-segment LED ladders monitor your output levels, and connections are 1/4-inch TRS and female XLR on the input side with 1/4-inch TRS and male XLR on the output. The chassis is 19 x 6 x 1.75 inches and weighs 4.8 pounds, in stainless steel. Owners running Levinson and NHT gear say it matches room-correction processing that costs far more.

One practical note: the connections are XLR and TRS only, with no RCA, so home stereo owners will need RCA-to-XLR patch cords to bridge the gap. That is a wiring task, not a limitation, and owners say the setup is easy once you have the right cables. It is a 4.5-star unit that punches above its station, with a quiet signal path and separation that serious listeners describe as superb.

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The one that goes dead silent when the music stops — and stays silent.

The dbx 231s is the flagship of this roundup: a dual-channel 31-band equalizer with 1/3-octave constant Q frequency bands, so each slider holds its shape and spacing no matter how far you push it. Switchable boost and cut ranges of 6 or 12 dB give you control over correction strength, a front-panel bypass switch handles instant comparisons, and a 12 dB input gain range lets you dial in levels. Four-segment LED ladders monitor output levels, and inputs and outputs offer both 1/4-inch TRS and XLR connections — pin 2 hot on the XLRs.

The signature is its noise floor. Owners who replaced noisy equalizers from other brands describe this one as super quiet when paused, with no ground-loop issues — and that low noise floor is what makes a 31-band unit usable in a serious chain, since a high noise floor smears detail as you engage more bands. One listener reports buying it to replace a 15-band unit and dropping a high-pitched squeak around 3.15kHz from soprano, tenor and violin without losing sound integrity. The stainless-steel chassis measures 19 x 6 x 3.5 inches and weighs 7.9 pounds.

The honest tension is build quality, which is mixed in the owner feedback — some describe the assembly in blunt terms. In practice, the metal chassis is solid and the sliders need a firm push to move, which keeps them from drifting once set. A more mundane gripe: some wish the power switch were on the back. And the connections are XLR and TRS only with no RCA, so home stereo owners will need adapter cables. Pair it with the Schiit Loki Mini+ or the dbx 215s and you have matched-gear reliability across a whole rack; on its own it is a 4.4-star workhorse that most listeners never outgrow.