Re: Celestion G12L-35
A few years ago, I was considering buying one of these used and inquired about it with Dr. Decibel on Celestion's website. His response:
The G12L-35 used a 1.5" diameter voice coil with a kapton former for good temperature resistance and a 20oz ceramic magnet, giving 95dB (1W@1m) sensitivity, 90-5.5kHz frequency response and a well balanced and versatile modern character with bright treble, percussive bass and quite a neutral but lively feel. The current Rocket 50 is very close in design and tone.
I think the light magnet (that's what the "L" stands for) is the important thing here - it makes the speaker about 3 dB less efficient than "M" magnet speakers. Some "H" magnet Celestions and Eminence Redcoat/Patriot speakers are near or oever 100 dB these days. Remember: a 3 dB increase in speaker efficiency is the same as doubling the amp power output.
So, the G12L-35 low efficiency can can mean two things: if you're looking for power-amp overdrive at reasonable volumes, an inefficient speaker is good; it lets you crank the amp without excessive volume. On the other hand, if you need extra volume to compete with a drummer or band, a more efficient speaker is an easy to get more volume without buying a bigger amp. (Putting a 101 dB Redcoat in there would sound like quadrupling you amp's power.)