Curly wrote:
Many claim the 28’s bass performance is on par with the 20’s.
if Geoff were to read this, I’d love for him to explain how he managed that, given the area of the 20’s 10” driver is significantly greater than the area of the 28’s 6.5” driver. :)
Cheers!
Hi,
This is an easy one to explain.
First, the analogy:
Consider two cars, driving side-by-side on the highway. Both are going 100 km/h. One is a 2011 Honda Civic (my car) and the other is a 2021 Bugatti Chiron (not my car). These two cars have very different capabilities, but, at this moment in the example, they're both going exactly the same speed.
Of course, if both drivers put their foot down at the same time, the two cars will respond differently - one will accelerate faster than the other, and will reach a higher top speed.
Now to loudspeakers:
Any loudspeaker of any size can produce any frequency in the audio range. However, the LEVEL at which they can produce that frequency changes with the driver dimensions and excursion.
For example, a 1" tweeter can move in and out 20 times per second, therefore it can produce audio at 20 Hz. However, it can't move very far, so it won't be very loud. Similarly, a large woofer can (in theory) move 20,000 times per second - but if you push it too hard, then the mass of the woofer will be hard to vibrate, and all you'll do is to heat up the voice coil.
So, generally speaking, with the right filtering and enough amplifier power: any loudspeaker can produce any frequency range (for a little while), depending on the level.
This also means that, at a low-enough listening level (which might mean "a normal listening level"), a 6.5" woofer and a 10" woofer will both produce the same output (just like the two cars both going 100 km/h). It's only when you start turning up the volume* that a difference starts occurring - the 10" woofer can play low frequencies louder than the 6.5" woofer.
This question has occurred before - some people were confused looking at the "frequency range" specifications that the Beolab 12-1 (with 1 woofer) goes lower than the 12-2 (with 2 woofers). This is true because of the level at which the measurement is done. Turn up the level, and you'll get a different answer.
For a more detailed explanation of this question, check out this posting: