Q Acoustics 3020c vs 3030c

The short answer

Buy the 3030c if it will sit on a stand or a surface at least 13 inches deep, and buy the 3020cif it will not. That is genuinely most of the decision, because Q Acoustics has not used this pair of models to separate a good speaker from a lesser one — the tweeter, the cone technology, the cabinet bracing, the nominal impedance and the power recommendation are the same on both spec sheets. What differs is how much air the cabinet encloses and how big the cone pushing it is.

The four rows that differ, in order of how much they matter

1. Cabinet volume: 6.9 L against 12.5 L

This is the root cause of everything else. The 3030c encloses 81% more air than the 3020c, and for a reflex design that is what buys low-frequency output. It is also why the published response moves from 60 Hz to 48 Hz. Nothing about the driver material or the crossover does that work; the box does.

2. Low-frequency limit: 60 Hz against 48 Hz, both at -6 dB

Twelve hertz, on the same test condition, from the same maker — which is exactly the circumstance in which a frequency-response comparison is worth something. For records this is a smaller difference than it sounds: most vinyl carries little energy below 40 Hz by design, because large low-frequency excursions are what push a stylus out of the groove. The 3030c’s advantage is audible on organ, synth bass and well-cut 45 RPM pressings, and close to inaudible on a 1970s rock LP.

3. Crossover: 2.6 kHz against 2.5 kHz

A hundred hertz lower on the 3030c, which hands a fraction less of the upper midrange to the 22 mm tweeter and a fraction more to the larger cone. On vocals — which is most of what is on a record — a lower crossover generally means the transition sits further from the region your ear is most sensitive to. This is a detail, not a headline, and it points the same way as the driver size.

4. Sensitivity and impedance: the row that runs backwards

Here is the counter-intuitive one. The bigger speaker is less sensitive: Q Acoustics publishes 86.5 dB for the 3030c against 87.0 dB for the 3020c, on the same 1 m / 2.83 Vrms / 1 kHz condition. Half a decibel is not audible on its own, but it is the opposite of what most people assume a larger cabinet buys, and it means the 3030c needs marginally more amplifier power than its little brother to play equally loud.

The minimum impedance moves the other way: 3.9 ohms on the 3030c against 3.7 ohmson the 3020c, so the bigger pair is a fractionally kinder load where the dip happens. Both are nominally 6 ohms, both dip below 4, and both therefore want an amplifier that is comfortable with a 4-ohm load — see our amplifier roundup, and note that this is one of the few cases where the cheapest class-D board is a false economy.

What is identical, and why that is the real story

Six rows in the table above are the same on both sheets: the two-way reflex topology, the 22 mm hermetically sealed tweeter mechanically isolated from the baffle, the C3 Continuous Curved Cone profile, the P2P cabinet bracing, the 6-ohm nominal rating and the 25 to 90 W recommendation. Neither pair has a phono input, because neither is powered.

That matters when you are deciding how much to spend. You are not buying a better tweeter or a better cabinet technique by moving up — you are buying displaced air. If the budget is tight and the choice is between the 3030c alone and the 3020c plus a pair of stands, the second option will usually sound better in a normal room, because getting the tweeter to ear height and the cabinet off a resonant surface fixes more than 12 Hz of extension.

Which one for which record setup

• A deck on a sideboard in a living room, speakers on stands:the 3030c. The room is big enough to use the extension and the stands solve the cabinet’s size.
• A deck and speakers sharing one shelf unit:the 3020c, and move the speakers off that shelf if you possibly can. Speakers and a turntable on the same surface is the one placement rule in vinyl that is not negotiable — a stylus cannot tell furniture-borne vibration from groove modulation, as our placement guide explains.
• A desk or a small room: the 3020c. At close range the 3030c has no room to develop its bass advantage and its cabinet is simply in the way.
• A first vinyl system with one budget for everything:neither. Both are passive, so the price buys drivers and a cabinet only. A powered pair with a phono stage inside — see speakers with a phono preamp — gets a turntable playing for similar money.

The generation note, because it changes the comparison

These replaced the 3000i range, and the swap is not like for like. The discontinued 3030iused a 165 mm driver and published a 46 Hz bass extension — a bigger cone and a slightly lower figure than the 3030c that now carries the name. If you are weighing a used 3030i against a new 3030c, the newer speaker is the current design with the sealed and isolated tweeter and the C3 cone, and the older one is the larger driver. Our 3020c review covers what the c generation actually changed, and our bookshelf roundup records why the 3030i was retired from this site when its listings went dead.