Buy Authentic – Buy safe JBL QUALITY. Authentic speaker flap includes compliance logos with serial number vs. Counterfeit is missing logos and serial number + has a SD card reader in some cases. What to do if you think you have purchased a counterfeit JBL Product.

I'm sure one of this site's 'elders' will take a stab at it.I guess that's me. I'm an elder.

As I recall, George Martin (Jim Lansing's brother) was in charge of keeping track of serial numbers (on Fletcher Drive, and on Casitas Avenue). He entered all the serial numbers he had used each day in a small book he kept at his workbench. I believe that book got destroyed in a fire. That was the only record of which serial number was used - and when. The only other possible source might be the nameplate company (was it Nelson Nameplate?) who might still have some records as to serial number batches they made during a period.

I think we ordered about 3 or 4 months worth at a time. Servidores linux guia prtico carlos e morimoto download pdf. Sozdanie animacii dlya beguschej stroki.

Shouldn't make any difference as for as sound goes. Weather 100 speakers were built in between them are they came off the line next to each other. I remember buying my L100a's new around 1978. I read an advertisement in the Saturday morning newspaper that Pacific Stereo had a handful on sale for that day only.

I rushed to the store and the salesman told me to grab any two and then pick the color of the grilles and grab one of those boxes. As a super excited 19 year old I didn't stop to think about serial numbers. I just picked two, paid and got the hell out of there. Smoked a fatty on the way home and enjoyed my new JBL's later on. As you can see 19 numbers from each other. Close, but no cigar. That is very far apart so not big nit pick JBL change vendors for caps and l-pads too If driver types match should be ok but that far apart veneer almost always not very good match Tweeter change 3 times on L100 from start to finish look same but not Those number so far apart woofer might not be the same either look same but not same polarity or cab wire Back in day so many L100 get sold guy at store just grab box off shelf not pay attention to number so 10 20 even 100 apart normal but thousands apart?

Grain match JBL fairly rare so who care if 10 20 apart but 100,000 is lot! Not even sound right! That pair of speakers put together paired up by somebody or came from PX or JBL warehouse direct where number that far apart could both be in same batch inventory No pair have number that far apart for normal reason or from little stereo store in 1970s unless lost in attic and L100 not all same even late type I almost will bet JBL never had 100,000 pair in warehouse at same time Maybe someone do cap job and buy used foilcal off auction or put drivers in different box? It seems like it wouldn't be too difficult to investigate further. Remove and compare the individual drivers against the ones from the other speaker (Woofer, Mid, Tweeter), including visual comparison as well as comparison of any model numbers printed directly on the drivers. Compare the empty cabinets to see if there are any differences in terms of the port, the stuffing, where the crossover is mounted, etc.

Compare the crossover in each speaker to see if they have the same layout and identical components, etc. If no differences are found, then I really cannot see this as a big deal, and don't see where any perceived difference in sound would be coming from.

It seems like it wouldn't be too difficult to investigate further. Remove and compare the individual drivers against the ones from the other speaker (Woofer, Mid, Tweeter), including visual comparison as well as comparison of any model numbers printed directly on the drivers. Compare the empty cabinets to see if there are any differences in terms of the port, the stuffing, where the crossover is mounted, etc. Compare the crossover in each speaker to see if they have the same layout and identical components, etc. If no differences are found, then I really cannot see this as a big deal, and don't see where any perceived difference in sound would be coming from. Click to expand.Believe what want to believe unless seller find unsophisticated collector will have hard time realizing top dollar for mismatch pair and 100,000 units apart is BIG mismatch for JBL L100 Explain one more time different vendors for caps for pots for wire and different woofers MAIN thing and 123-? 12' varants all sound AND MEASURE different even Aquaplas on cones different in different batches over long time Woofer polarity can be different too and numbers on JBL drivers not always tell truth if ever reconed Average person might not hear but many people will and LOTS of Frankenspeakers out there in JBL world thanks to cannibals Have nice night!; - ) JJ.