"I also have your Marcus Retro preamp installed in my Fender Marcus Miller Jazz, and it’s fabulous! All of your preamps boast exceptional build quality and pristine sound with pure tone and no hiss whatsoever. John, you are a true master of your craft… can’t thank you enough!"
"All of your preamps boast exceptional build quality and pristine sound with pure tone and no hiss whatsoever. John, you are a true master of your craft… can’t thank you enough!"
"Hi John wanna say only thank you for your incredible craftsmanship, in my 77 music man it is killer and opens the palette of the instrument in an incredible way without changing the vintage vibe, congrats you nailed it."
"The installation is really very easy and everything is perfectly designed! The sound obtained is great (replacement of the original preamp on a Sterling stingray Ray4 with the Seymour Duncan SMB-4A and the result is awesome!"
" have replaced stock preamp with yours on sterling sub 5. Result much reacher tone than expected. Bravo!! ...works with stock amazingly!! Thank you for very quality product!!"
" now played it a couple of days and like it a lot. Very transparent and totally noise/hum free. With a short cable and flat EQ, the passive and active tones and volumes are identical. The active setting allows longer cables and I can dial in some bass and treble EQ. Sweet, especially with my MM-style bridge pickup... A very nice design and another happy customer."
"Just wanted to let you know I’ve installed the preamp and am very happy with it. Thanks for doing the mid control mod"
"All hooked up in the Fender. Sounds beautiful. "
"I just received the P-retro unit this morning and installed it. I am so impressed!! I can’t wait to take it out on some gigs soon. I don’t think I’ve ever seen a unit that really takes into account the particular mindset of a P-Bass player so well."
"I installed the P-Retro in a '74 P, and loved it! Worked precisely as advertised. Thank you for your time, and again thank you for the P-Retro, a super smart design!!"
"In a word outstanding, one of the best bass pre amps ever! Will be using and recommending wherever we build a bass. Nathan may have some install comments."
"Got the pre-amp fitted over the weekend to finish this build – sounds awesome – thanks!"
"Your kind and responsive service is a real benchmark in the industry as is your fabulous preamp !!!"
"My gosh, this tone is what I've been searching for....I was thrilled with it! I played it all afternoon ....."full, rich, articulate"....I seriously couldn't be happier"
"Your preamp has breathed new life into my Musicman Classic 5! The installation was a super easy cost-effective breeze."
"Great design! Love the sound."
"It’s amazing. I love the sound. And the installation of the preamp is done without problem in 18v."
" It make my bass sound softer, warmer, bigger, punchier, more old-school, more mean....All the great pre-EB StingRay's sounds are here!"
"I knew it would be good and no surprise it was awesome!! My bass hasn't changed its voice the but it now speaks a lot sexier and clearer! "
"Installed now and I played the bass since 1 hour... I prefer that than the original MusicMan sound. ...It’s like I have installed new strings."
"I’m loving the preamp on gigs. I have been running active all the time with everything flat and the sound cuts through beautifully. "
"The eq is really powerful. I love it. Also this bass is now the quietest of all my basses. This bass is killer!"
"I am ever so impressed. It went in and worked straight away in my Warwick 5 string. It’s marvelous! "
"Our sound guy says it’s the best sounding bass he has ever heard through a PA and has banned me from using anything else."
"This preamp will be the next Prime Minister and speak on behalf of all preamp citizens out there!""
"The UNI-PRE was exactly what I'd been looking for and did all the things I required from it, and more!"  "
"It sounds fan-tastic! I'm still experimenting with the possibillities of course, but instant Marcus sound out of the box"
"They were all amazed with the sound of the instrument and now they want their products in Brazil."
"What a difference it makes! The bass is like a completely new instrument with it. I'm one happy customer"
"received my DJ-Retro sat morning, fitted by lunchtime works a treat, thank you for the excellent service"
"The sound is amazing and it was very easy to fit. I like the screw-in terminals for the pickups .....Your preamp is a work of art!"
"Wow, what beautiful preamp. Love what does set at the detents, plus all the other sounds."
"What a wonderful product; the orignal pre-amp worked well enough, but the j-retro deluxe seems to be superb in every aspect."
"I absolutely love it!! I can't say enough great things about your preamp. My bass now sounds amazing....Passive, Active or whatever....It all sounds great!"
"On opening my J Deluxe I was astounded by the evident quality. I am truly astounded by the improvement. Â It is as different as chalk and cheese."
"They really are great preamps....beats the pants off a few high level instruments I've had!"
"I just popped it in my bass within a few minutes. It sounds great."
"What can I say? I love it and It's made an amazing difference to the sound. Many thanks for a great piece of kit!! "
"Oh my…I think this just became my favorite bass! Those Fralin pickups have all sorts of growly tones buried in there, and the preamp brings them out VERY nicely."
"Your retro pre-amp gives an amazing range of tones for me to play with, like having a totally different bass, but still a Jazz."
"It’s like having a new bass, with lots and lots of new sounds in it. Most impressed."
"I never thought how much improvement your preamp would add, I just can't believe the possibilities now. Every detail, parts on the pre amp speaks quality."
"I have everything on my board shut off other than the compressor and the tone is just wonderful."
"I was so pleased with the new preamp "
"I don’t think the fender custom shop could better it whatever I spent there - my dream bass"
"The J-Tone preamp has elevated the sound from an already fine bass into a sonic realm that’s perfect for my needs."
"I’m over the moon with the J Tone, it’s such a lovely addition to my bass."
"IMO if you want to give your bass a STEROID type boost, stick one of these ‘bad boys’ in. You won’t be disappointed"
