The starting point
Compare audio specifications only after checking their definitions and test conditions. Keep maximum SPL, frequency range, power handling and amplifier output as separate quantities. Then confirm the exact cabinet, electronics and processing used for the proposed system.
Ask what sits behind the maximum-SPL number
A useful output specification identifies the distance, acoustic conditions, signal and operating configuration. For example, manufacturer documentation can state peak SPL at one metre in free field with a specified noise signal, and give different results for different amplifier or operating arrangements. A bare dB number leaves those distinctions unresolved.
When two quotations show different output values, ask both suppliers for the corresponding measurement basis. Keep the values in separate columns until their definitions match. Do not turn a cabinet’s listed output into a guaranteed audience level without a system design.
Keep the frequency-range tolerance attached
A frequency range with a stated tolerance is more specific than its two endpoint numbers alone. Keep labels such as −5 dB or −10 dB, the processor setting and the operating configuration beside the range. Do not silently combine endpoints taken from different tables or modes.
For your project, state the programme and intended use of subwoofers. Ask which response information applies to the main cabinet on its own and which applies to the complete system. This makes the comparison relevant to the equipment being supplied.
Separate cabinet power handling from amplifier output
A loudspeaker’s power-handling label and an amplifier’s output specification describe different things. For amplifier comparison, retain the load impedance, number of driven channels, signal type and measurement duration. Manufacturer reference tables can report different results for noise, burst and sine-wave tests.
Request an explicit cabinet-to-amplifier channel plan with the required presets and protection settings. Do not select a match by applying one universal wattage multiplier to every loudspeaker or by treating every figure labelled ‘peak’ as equivalent.
Use one comparison sheet for the whole proposal
- Exact cabinet model, active or passive variant, and quantity.
- Frequency range with its tolerance and operating mode.
- Maximum SPL with distance, signal, conditions and system configuration.
- Amplifier load, channel allocation, processing and protection settings.
- Coverage, dimensions, weight, connections and documented mounting requirements.
- Unresolved differences, the person confirming each item and the final accepted specification.
Common questions
Can I compare two frequency ranges with different dB tolerances?
Keep the tolerances visible and request comparable response data. The same endpoint frequencies at different tolerances do not establish the same response.
Does more amplifier power always mean a better loudspeaker system?
No. The load, cabinet operating limits, processing, coverage and intended programme all need to be considered. Request a documented system arrangement for the specific equipment.
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