Vinyl Newbie - So Many Questions!


New to these forums and new to vinyl, but longtime audiophile, so I feel comfortable saying that I know what I’m hearing but can’t figure out why. 

It would probably help if I summarize my system to aid in troubleshooting:

Marantz TT 15S1

iFi Zen phono preamp

Naim Uniti Atom as streamer/preamp/dac

Conrad Johnson CAV-45 S2

Klipsch Cornwall IV

I’ll start with the easy one

1.  I followed the setup instructions for the Marantz tt meticulously. Every time I start the motor, the belt squeaks and slips on the motor pulley before getting up to speed. It’s annoying and really cheapens the experience. Is this normal?

 

2.  The sound quality ranges from very bad to very good, largely dependent on the record. I don’t have a large collection as I just started with vinyl, but many of these pressings sound absolutely terrible. Many sound distorted and compressed. Many have tons of clicks and pops. I double checked the settings on my phono preamp which is really just moving magnet. There aren’t a lot of settings. One for MM and three for MC. I connected the phono preamp directly to the Conrad Johnson instead of the analog input on the Naim and while it does sound “better”, it’s mostly the same. 
 

I don’t have another cartridge or phono preamp to swap out and try to isolate the issue. Could it simply be that the phono preamp is defective?  It seems that if the cartridge was defective it would just all sound bad.  Could it be that my system is revealing enough that it’s showing the limitation of the iFI?  I just think it would sound “good” all the time, but never really “great”. Could it be that all of these pressings are so incredibly crappy that I’m hearing just how bad they are?

The couple of “mainstream” records do sound pretty good. Namely Gregory Porter, Adele, Gary Clark Jr, Miles Davis, John Coltrane. But even a couple of those have inconsistently cut holes for the spindle (some of them bind), significant warps, and some off-center labels. The independent stuff is all over the map. A couple of the John Prine pressings sound very good, but have soooo many clicks and pops it’s ridiculous - even after cleaning. And one of them wouldn’t even go on the spindle because the hole was so small. 
 

Anyway, I’m just perplexed and pretty annoyed. I’ve debated buying another turntable (with cartridge) and phono preamp just to see if there’s any change.  Any suggestions?  Is that my best course of action - to just buy another preamp and cartridge to troubleshoot? 

doodledan

1. Don’t know yours but my platter is so heavy I wrecked the belt within a year. I got a reflex clamp and give it a twist before powering up. Still on the second one 35 years later. Belts are cheap. 2 now are less $$ than 1 then.

2. LP pressing quality varies insanely. I’ve bought many records that are quieter than new, sealed ones. All you CAN do is UltraSonically clean them before first play and cross your fingers. Then try another if you hope for better. OR spend up for Hot Platters.

It's impossible to know, for sure, what's going on without having a close look and listen to your audio system, as well as the records you describe.  That being said, the TT you have is top notch for its price point.  I did some serious seat-time with one 3 or 4 years ago and there was no start-up squeak or slipping.  On that front, I would make sure the bearing is adequately greased or lubricated, the floating motor is properly positioned and everything is accurately leveled.  If the squeaking and/or slipping continues, I would contact Marantz for troubleshooting.  Defective motor?  Defective belt?  Hard to say!  When not playing records, I would recommend taking the belt off to maintain its tensile strength and increase lifespan.  Start-up squeak wouldn't bother me if everything else works the way it should.  Some TT's, including high-end TT's, do that.  This one shouldn't.  With regard to belt slippage, I'd make sure the side of that acrylic platter is clean and does not have any kind of contaminant on it interfering with the belt's ability to grip.  There is a product you can coat the belt with to increase its stickiness, but you shouldn't be getting belt-slippage in the first place.

With regard to the varying conditions of the records you describe, I would say stop buying or getting them from wherever the heck you are getting them from!  That's deplorable!  Ultrasonic cleaning or any kind of effective record cleaning is, certainly, a great recommendation.  Getting a dust cover for your turntable, if you don't already have one, would be a good idea, as well.  I know some vinyl heads wouldn't dream of spinning records with a dust cover in place but I'm not one of them.  There is always dust in the air and that doesn't belong on records.  Using a good quality carbon fiber brush before play would be another good idea, as well as keeping your stylus clean.

There are a thousand other possible reasons for the sound quality variations but it's impossible to know without seeing and hearing your system.

Contact the vendor or Marantz about the belt squeak if it’s bothersome. It might go away as the player breaks in. Mine sometimes squeaks on startup, I don’t turn it off to change a LP so it’s one squeak per listening session, no big deal.
Your system deserves a much better phono stage than the $150 entry level Zen. I’d look for something in the $1k range, about half the cost of your TT/cart. Something with a decent power supply, no wall wart. I haven’t been paying attention to amps in that range so I can’t recommend any. Some vendors give a trial period, something to consider.
About the record noise, some are just poor quality and some labels are best avoided. A better phono stage can reduce some or maybe most of it.

1. Give it a helping hand. No big deal.

Assume you've ensured there's no oily contamination on the belt, the pulley, or platter. Ensure turntable is level in both planes. What is the turntable mounted on?