Everybody felt comfortable that increasing the published power ratings was a reasonable step.For a better experience, please enable JavaScript in your browser before proceeding.I did hear that the D131 might have an even tighter voice coil.I have had both and never noticed the difference, though I never ABd them.
I had my first pair of D120s in a 65 Twin Reverb that I bought in 1969. I have replaced the aluminum dust cap with paper on the last D120 and D130 JBLs I owned and know that paper dust caps sound much better to me. They warm up and smooth out the high end and get rid of the harshness of the aluminum dust caps. It costs about 5.00 in parts and takes me about 10 minutes to change. ![]() I cant help but wonder how it would have sounded with the paper covers. It wasnt until Leo Fenders other speaker suppliers were unable to keep up with his increasing needs and need to handle more watts that he started to use JBLs. IIRC, Harvey Gerst had updated the design of the D131 because they didnt stand up to heavy guitar use. What I should have said was the D-131 was a stereohifi speaker, while the 120 was for guitar - but it was called D-120F. I am surprised on the D131F - never thought they did a 131 for guitar. I had been looking for original cone D120s (very hard to find any more) for more than a year when I found these. Unfortunately, someone trying to help rearrange things in my car, picked up the speaker, that was face down on the carpet and put his fingers through the cone. Easy come.easy go. The gap on the D131 is smaller.053 compared to the D120F.057. The cone number on a D131 is 131-404 where the cone number on the D120F is 21032. Jbl D130 Upgrade In PowerIn regards to power handling.I believe the upgrade in power handling was only due to the fact that JBL knew these were going into guitar amps.Heres what Harvey Gerst says about that. Jbl D130 Series Is BecauseOkay, lemme clear this up once and for all: The only reason I raised the power rating on the F series is because the program source material had limited range. Typically, electric guitars go down to around 80Hz, but most of the energy is an octave above that, around 160Hz. The why has to do with string length, tension, and diameter - lets just say theres not as much fundamental there as most people think. So, I knew that guitars were mainly putting out from about 160Hz to around 3kHz, with some harmonics probably going out to around 6kHz. Not exactly the hardest range to handle for a big ass 12 or 15 JBL speaker. When it was time to really rate them, I brought them into the lab, hooked them up to our monster Mac - our tube 200 watts McIntosh, and started to play guitar, while we watched where they started to crap out.
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