90 dB/W/m against 88 dB at 2.83 V: the gap is 3.2 dB, not 2
Triangle is the only speaker here quoted in real watts. On one Yamaha A-S301 at 3 m the BR03 reaches 98.2 dB and the 6 Ω Q Acoustics 3030i 95.0 dB — the printed numbers differ by 2 dB.
Signal Chain Compatibility Matrix
Select gear and parameters for live gain, impedance and SPL calculations.
Input Equipment Setup
PASS: Optimal Signal Chain
Requires minimum +60dB of clean pre-amp gain. Most budget entry interfaces max out at +50dB to +56dB and introduce hiss at max pot. An inline preamp booster (Cloudlifter CL-1 / FetHead) is strongly recommended.
The interface preamp provides sufficient headroom.
$538
$405
-25%Tonal & acoustic characteristics: Flat, wide-range frequency response for clean music and speech. Smooth, warm acoustic character with air-suspension shock isolation.
Technical advisory: With +69dB max gain, the Gen 4 Solo can drive demanding dynamics like the Shure SM7B natively without requiring an external inline booster.
Physical Interconnect Topology
Shure SM7B
Direct Cable Connection (No Intermediate Box)
1x Shielded Balanced XLR Cable (3-Pin XLR Male to XLR Female)
Focusrite Scarlett Solo (Gen 4)
Host: Apple MacBook Pro (M1/M2/M3/M4)
Two scales that look like one.
Almost every bookshelf datasheet gives sensitivity at 2.83 V / 1 m. Triangle gives 90 dB/W/m — a real one-watt reference. The two scales coincide only at 8 Ω, where 2.83 V happens to be exactly 1 W. Into 6 Ω the same 2.83 V is 1.33 W, so a 6 Ω speaker quoted that way is about 1.2 dB flattered; into 4 Ω it would be flattered by exactly 3 dB, because 2.83 V there is 2 W.
What the calculator does with it. The BR03’s 90 dB goes in unchanged, because it is already per watt: on the A-S301 at 3 m it returns 98.2 dB, 6.8 dB below the 105 dB reference peak, impedance safe with a 4.2 Ω minimum against the amplifier’s 4 Ω, 1.5 % cable loss on 16 AWG and a damping factor of 47. Swap in the Q Acoustics 3030i — printed 88 dB, but at 2.83 V into 6 Ω — and the same amplifier at the same distance returns 95.0 dB. Printed difference: 2 dB. Calculated difference: 3.2 dB. Nothing else changed.
Why the watts are identical in both cases. The A-S301 is one of the few honest sheets in the catalogue: 60 W into 8 Ω at 0.019 % THD and 70 W into 6 Ω at 0.038 %, both full bandwidth, both channels driven, plus IHF dynamic power labelled as dynamic. The site’s calculation reads the 8 Ω rating for anything above 4 Ω, so both speakers above were driven with the same 60 W. The 3.2 dB is sensitivity alone.
Why it matters in a shop. 3.2 dB is the difference between an amplifier you never turn past halfway and one you keep pushing. It is also worth about a doubling of amplifier power — which costs far more than the speaker upgrade. One more thing on this amplifier: the impedance selector is a physical switch on the rear, and in its HIGH position it requires 6 Ω or more, while driving Speakers A and B together requires 8 Ω or more regardless of the switch. Yamaha warns not to move it with the amplifier powered on.