JBL 4312 crossovers – New crossovers – locked resistors + gold posts (PAIR)

This auction is for cross-over upgrade service for JBL brand speakers (PAIR). Model 4312 What you get with this purchase is 2 new crossovers built to original schematic with better quality parts and some small improvement to the circuit. This particular design has locked in resistors for the mid and tweeter, locked in at the “flat” (0) setting and Lpads are bypassed………this gives the best sound quality and long term reliability. This auction also includes the (4) gold 5-way posts. Get cleaner more dynamic midrange and highs with new level of resolution from your JBL 4312 with this upgrade. Upgrade consists of the following: *Nedlab Hi-Fi film 400V PP capacitors. *Film type , non-inductive resistors in signal path. * 4 gold binding posts *Install new OFC 99.99% pure copper wire. *Point to point wiring and lead free tin/silver solder. Fully tested on lab analyzer comes with frequency response test sheets. Matched pairs to +/-0.5db max deviation. Available also many other JBL models, just email with request. Price is for single crossover upgrade. For repairs, email me with your problems and I will quote fix cost. 20+ years of experience in hi fidelity crossover design. Customer comments: “Excellent work. Seller helped me a lot and I appreciate that!” another customer…….. “JBL L100 crossover upgrade. Results are in a word SUPERB. A+++” another customer…….. “Perfect!! Thanks again. Sounds great !!” (J.D.) another customer…….. “I put the crossovers in and I am stunned. I have had the L150’s since I purchased them new in 1980. They started irritating me awhile back. So I got these new crossovers. Wow. Again, wow. They sound like a new speaker. Well worth it.” J.M. another customer…….. “What an amazing difference the crossovers make. The mids and highs actually sound transparent. Thank you” D.W another customer…….. “excellent,item as described great packing,improved sound detail,impressed!” (W.E.) another customer…….. “Fantastic crossovers, they make my JBL100’s sing. Thank you.” another customer…….. “After several hours of listening to various LP’s on my “retro system” Thorens TD124 w SME 2009 and Shure V15IV through my Pioneer A27, I concluded that the L100s had been transformed into JBL 4311 studio monitors ! The sound stage seemed wider and the sound was clear and clean throughout the frequency ranges. With the old crossovers I was getting a muddy mid range and boomy bass. Now the mid range in particular was much cleaner and and more detailed. Your crossover upgrade has been the best speaker investment I’ve ever made.” another customer…….. “Does nice work! Great upgrade to JBL L100” another customer…….. “Very very good result.” F.P. another customer…….. “Installed them today……they sound spectacular” another customer…….. “Stellar JBL L100 crossovers! beautiful workmanship” another custom er…….. “My feedback is definitely positive. My good old JBL L100s are singing perfectly” another customer…….. “WOW! These are amazing. Among a long list of things that are wonderful the soundstage is absolutely phenomenal. Thank you.” (D.N.) another custom er…….. “I love the work you did. They sound great, thanks. (A.N.) Take a look at my other interesting audio related auctions.