What's the weakest link in my stereo set up? I live in a townhome, so limited on space.

Sub for townhome might bother your neighbor,space is a problem too. I will stick what you have. Enjoy the music.

IF open to used speakers, let us know where you live so we can look for suggestions near enough to allow you to hear them when you pick them up.

1st: I completely agree, simply change the stylus on your MP-150 Body to the 500.

https://forum.audiogon.com/discussions/who-is-using-nagaoka-phono-cartridges?highlight=nagaoka

Are you able to align/calibrate your cartridge? Near KAB? I'm walking distance from KAB in the Sleepy Hollow/Netherwood Heights historic district, Plainfield, NJ

excerpt

"knotscott

I picked up a Nagaoka MP-150 last spring, and added the JN-P (MP500) nude line contact stylus on boron cantilever to it, and think it’s spectacular. Incredibly musical with beautifully refined detail, amazing midrange clarity and separation. It sounds like I have wanted all my other carts to sound since getting into this in the early 80s. All in for ~ $570...not cheap, but not outrageous for the sound I’m getting"

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next, maximize imaging by improving initial sound wave distribution/reception. create a virtual system on this site, post some photos, so the ideas of across the width or down the length and your equipment/furniture/you didn't mention video? are easier to understand, suggestions will be easier to make and understand

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future changes

speakers, I would forget all/any subtle modifications for now,

re- arrange things so you can have larger speakers, 3 way placed/aimed best toed-in/tilted back to minimize floor/ceiling/side walls reflections (slanted face design/mid height on slanted stand/ or taller floor standing flat face slanted back to aim tweeters at seated ear level)

my assumption/guess: a small 5.1 home theater/music combo system, AVR with FRONT pre-outs, does the Cambridge have a home theater bypass input?

room treatments, maybe, but start simply with an easily re-positioned area rug

Toe In Alternates, Stereo and Video

@vrikkian room treatment and the addition of a sub are 1a and 1b.  You can experiment with room treatment with pillow’s, throw rugs, blankets and other various items.  Google / hit up some forums with threads, it will give you some solid, creative ideas that you and your better half can likely both live with.  On a sub, I’d reach out to 2-3 different manufactures, distributors for advice.  SVS, Crutchfeild, The Music Room, Upscale Audio.  Ask for their advice based on your placement, space limitations.  If there isn’t a solid solution found for a sub then look to sell the Focal’s and focus on bookshelf speakers known to put out solid low end performance through clever design and engineering.  Buy used, you might be able to stay on budget with the sale of your Focal’s.  Alta Audio Alyssa’s are an example of bookshelf speakers that can really fill a room, have a surprising low end performance.  There are other brands, models that can do the same.

If you then get pulled down the rabbit hole of upgrades, I would focus on your amp first.  You can use the Cambridge as a streamer, DAC, Pre and feed a standalone Amp that if you upgrade your speakers, would be the next best step.  It would maintain the ease of use of your current system, outside room treatment would check the biggest influencers on performance, speakers and how you feed them. 
 

DSP / Room correction was also recommended, you could look at something like the Wiim with DSP / Room correction, inexpensive little unit that can stream, has a DAC and most importantly has DSP / Room Correction, really cheap entry into exploring if that makes a big impact and could help you figure out how to room treat which is an overall better option than DSP.  I’m not sure if your Cambridge is a Roon endpoint, you can also do some DSP using Roon, you cloud research that and trial it for free.  That would take more work and either your ability to figure out how to adjust the frequency responses to offset shortfalls of your room or having a 3rd party design some filters for you.

As your system sits right now it appears to be well matched, balanced.  I can’t speak to the synergy which is key but on paper, you have done a nice job matching components that should compliment each other.  Strongest portion of your system seems to be your vinyl set up, that’s probably the last portion I would look at.  Tempting to tweak the set up but you likely need to upgrade other components first to really appreciate the incremental improvements you’ll get from the incremental changes, improvements to your TT, vinyl set up.

Seems like you have many sound reflections. High ceilings and hardwood floors. You should do a clap test to see how bad your room echoes. Then start treating room accordingly. You may need to deaden a few areas since sound is reflected 20 ft up? So walls and floors may need absorption; area carpet, heavy drapes, etc. if you have windows that’s another hard reflection. Read up on sound absorbers and reflectors.
That could be a start to improving sound without buying equipment yet. 

I’m now retired and downsized to a three story townhouse after decades of audiophilia. My guidance is to sound treat your listening space(s) to mitigate spot-specific variances. What ever equipment you upgrade to, it will sound better in a sonically optimized room.  

I’m now retired and downsized to a three story townhouse after decades of audiophilia. My guidance is to sound treat your listening space(s) to mitigate spot-specific variances. What ever equipment you upgrade to, it will sound better in a sonically optimized room.  

About subs, I’ve never looked into it because, as noted, space is a major factor.  I cannot simply put the sub in front of the cabinet since that’s walking space.

Putting a sub into an empty cabinet space is a hard pass too, right? My cabinet is both open on the front and back, so heat is not an issue. I’ve had my phono and stereo amp on one of my cabinet’s shelves for years now and have no issues at all.

I would do the stylus, but also explore improving your speakers. Focal 906 have a nice tweeter, but my experience with them leaves me wanting more defined midrange and bass extension. There are better options with similar cabinet size. 
 

I have and love the Focal 906's even though I paid twice your price. My adding a single Rel S510 sub gave my system a massive lift. If I could do it again, I would have spent the same money on two smaller subs. Due to desired aesthetics, the sub should be better positioned; however, it still improves my 906's immensely.

An old time audio buddy of mine (and audio store owner) used to tell me "you can't get big speaker sound from a small speaker." A generality I know but if it's scale that you are seeking, bookshelves won't provide it. A nice compact pair of floor standers will have the same footprint as bookshelf + stands. As suggested above adding a sub will fill out the bottom end. It takes time and effort but can take small speakers to a new height. That depends on budget and space consideration of course and willingness to tweak and adjust. Some of the best "scale" in music I have owned was provided by a pair of Magnepan LRS's + 2 small subs. Not always practical I know. I'd maybe seek a compact pair of floor standers first IMHO....

Focal speakers only go down to 55 Hz ... so @travelinjack is probably the best suggestion; your TT set up is commendable; upgrades with cart et cetera will be marginal compared to opening up the low end!

Switch the Cambridge out on next upgrade as @fatdaddy2 correctly identified ... plenty of great options await

Good luck!

Spotify in NG compressed files 

buy a copy dedicated dac or much better dac streamer combo 

buy a sub for your speakers ,a$600 Svs pro 1000 with a nice remote app   To adjust  ,cables, power chords for the money Pangea sig,MK2

Wireworld Equinox would be perfect for your setup, very good quality reasonable 

price 

Agree with sub recommendation; for your budget you can't do much of an improvement in your TT setup.  Cambridge is (IMO) a weak link, but since it serves multiple functions, may not be able to improve within your budget.  Let you wife select a nice area rug; can help tame a somewhat live room and give her input into the room aesthetic.

Enjoy the music.if your cart is used alot you may want to change.the turntable is good been around for decades and proven.focal are great speakers even the older models.these days you can dsp your system and room.have fun keep the spouse happy you know happy wife happy life enjoy the experiment.see if there is an audio club in your town to swap equipment.crutchfield gives 60 days and upscale audio may as well on speakers.

I think you know who the weakest link in your set up is. For your wife's needs, your system is perfect.

Subwoofer all day long. You are missing a ton of bass. Take some of load off the 906 and let a subwoofer do the heavy lifting. Buy the subwoofer with the best specs in your budget which is likely the SVS SB-2000 Pro.

Sounds like getting a new cart is an easy sell. I’ll go with the new needle first.

Next, since I like my Focals, I’ll see if there are better bookshelves out there than the ones I have now that have been discontinued for some time.

Townhouses and stereos sometimes don't mix well. Living too close to other people causes a lack of volume and dynamics. 

@vrikkian Can the JN-P500 fit onto the body of the MP-150? If so, that may be an extremely economical way to get some upgrades without swapping out audio.

It certainly can.  It's a perfect friction fit.  As stated, I did add some mass to the headshell to compensate for differences in the cart weight between the MP150 and MP500, but am not sure it's even necessary.  It's subjective, but the results sound sublime to me.  

I don't know how good your phono stage is, so I would probably upgrade to Nagaoka MP500 cartridge first. Or perhaps the speakers, but you say you like them.

Agree with larsman. There are very attractive wall treatments available today.

I agree best bang for buck would be stylus / cart. 

Cables on the turntable are what KAB put on when they upgraded the table about five years ago. They are better than stock, but I honestly have no idea how to find out the "brand" and "make".

The power cord goes to an external speed controller that KAB also gave me.

Can the JN-P500 fit onto the body of the MP-150? If so, that may be an extremely economical way to get some upgrades without swapping out audio.

My TT already has isolation feet on it (put on by KAB), so I think we are good on that side.

Floors are solid hardwood. No carpet. I can possibly add some sound dampening to the walls, but I have no idea about placement.

I do have the turntable turned to face the width of the townhouse (i.e. facing the wall that is a shorter distance). If I am able to convince the wife to turn the turntable and the whole set up to be facing the further walls (i.e. go the length of the townhome instead of the width), would that be an improvement? i.e. more space means the sound doesn't immediately bounce off a wall.

The room will have more effect on sound than the gear. If there's anything you can do in that regard that your spouse would approve of - and some sound treatments can still be very attractive aesthetically - Makes a big difference whether you're on hardwood floors or wall-to-wall carpeting. Makes a big difference if you have plush furniture and stuff on the walls or if your furniture is minimalistic with the walls being unbroken flat planes, to help control sound bouncing around all over. 

Many here will ask questions similar to these? What do you think you are lacking? Dynamics, bass, soundstage etc, etc? What kind of music do you listen to? Would your speakers be close to a wall or can you have them out in the room? Stands? Are you limited by WAF? (Wife acceptance factor) in terms of aesthetics. I agree you have a good enough turntable and upgrading the cartridge could help. BUT what are you looking for, specifically? And of course, what is your budget? After all, many wives care about that too.

The first thing I’d do is add the JN-P200 or JN-P500 stylus to your MP150. The 200 adds the benefit of the boron cantilever. The 500 goes a step farther with boron cantilever, and a fine line stylus. Both are great upgrades over the 150. Amazon shows them @ $156 and $252 currently....almost a no brainer, but it is subjective.  (I added the JN-P500 to my MP150, and love it.  The friction fit is fine, and you can leave the screw off.  I added a few grams of mass to the headshell to offset cartridge weight differences)

You already have a very well regarded TT, but isolation pucks or platform can help optimize things.

An active sub (or 2) is an easy and affordable improvement as well.

How are your cables and interconnects?