Yes I appreciate all your input and yes the prime 4 would be future proof with the extra inputs. The only thing against the prime 4 is the size and I sold all my vinyl many years ago 
Cdj’s I do own but ideally I want to have everything on hard drives etc so sizing down so to speak
In a dilemma 
U know you can whack an internal ssd in it too?
Both Prime 4 & 2 for internal sata drive 
for me you will regret going from 4 to 2 … then you see. The dimensions are not all that different and neither is the weight. Rather get P4 changed with a new one … so much money you spent by now, right?
Ok I’m sending back the prime 4 so have a couple of days to decide on the replacement
I’m sticking to my advice to you. 
Choose wisely.
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What advice Reese? Stay with P4?
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I got prime 2 solely because thought prime 4 was too big and didn’t need all the features of the prime 4 like 4 channels zone out etc. I love my Prime 2 it’s amazing piece of kit and to have the Streaming features built into it is the game changer standalone with WiFi built in awesome go for Prime 2
Of course, but it’s your call. I cannot choose for you.
Hi yes wasn’t impressed with the fx effects at the top of the prime 4 unit (Virtual DJ so much better iE beat grid etc) the sweep fx at the bottom of the prime 4 were good but no idea why noise is a good fx! Couldn’t pre listen too all effects in headphones either. What fx does the prime 2 have?
Well only real issue I have with the Denon units and probably being picky as Ive came from being a Traktor DJ for years and in my opinion the have the best FX on the DJ market but Denon is pretty new player in the digital DJ market and will only get better and keep adding like they added new FX to there premium mixer last week so I’m sure more will be added into other units and the fact the hardware has a os system in them makes it easier to add more new features as their motto says embrace the future
All You are right except that denon is new to the market…
They started producing dj gear way back in 1981/1983… if I remember good.
So long history here
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Yes of I know they have been in the DJ market for many years but I meant as far as software is concerned and incorporated within hardware etc the whole engine and engine prime thing is pretty new and no doubt they have all the expertise when it comes to the DJ world plus the fact that they have now guys on there team that worked with Serato and pioneer DJ the guys at Denon have created something special in the new DJ world and can only get better
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Noise is a good effect when you start to turn it slowly, it is really giving a good effect. If you turn it fast it’s not good at all.
Noise effect is great for artificial scratch as well with fast turning and cutting with a Crossfader.
If you just want to compare FX:
On Prime 2
Echo, Delay, Hall, Ping pong, Auto Gate, Flanger, LFO filter, Phaser, Crush, Roll, Rev.Roll, Scratch, Reverb. Details about it on page 30 of the user guide
- Prime 2 adds 1/64 beats selectable (Prime 4 goes up to 1/32 currently)
- Prime 2 adds 16 beats selectable (Prime 4 goes up to 8 currently)
- Prime 2 adds 32 beats selectable (Prime 4 goes up to 8 currently)
1 sweep FX: Filter
Prime 4 will add:
- Add Beat Break FX (Pattern)
- Some different names (Hall Echo vs Hall, Filter LFO vs LFO Filter, Bit Crush vs Crush)
- FX Frequency to all FX (<60 Hz – <18.2 kHz, All Bands, >60 Hz – >18.2 kHz)
- FX Frequency reset knob
- Routable Channel FX (route to FX bank 1 or 2, independent for all 4 channels) vs fixed bank to channel on Prime 2
- Independent time buttons & parameter knob + button instead of toggling knob
4 sweep FX: Filter, Noise, Echo, Wash Out
There are a lot more differences between the units, like:
- 4 decks vs 2 decks
- Extra top USB port on Prime 4
- Prime 4 unlocks Serato DJ Pro for free (and is Serato DJ Pro compatible)
- Bigger (and different) screen on Prime 4
- Adjustable Display on Prime 4
- Zone Out on Prime 4 (with adjustable crossfade time) with 2 band EQ
- Booth EQ
- Independent mic EQ on Prime 4 vs overall Mic EQ on Prime 2
- Microphone echo
- More advanced microphone settings on Prime 4 (talkover control, refined attenuation)
- 4 full featured RCA line inputs on Prime 4 vs 1 Aux input without EQ
- Possibility to connect turntables on Prime 4 (phono line switch / grounding)
- Cue button color matches deck color on Prime 4 vs white on Prime 2
- Led platter ring (indicating deck color, track end warning optional, on air mode optional) on Prime 4
- Dedicated Edit Grid button on Prime 4 vs hold Slip on Prime 2
- Grid marker buttons on Prime 4
- Bigger performance pads on Prime 4
- Fader start on crossfader
- Master limiter in settings
- Headphone gain in settings
- Stop time button on Prime 2 vs digital touchscreen setting in Prime 4
- Track Preview already available on Prime 2 (with preview volume control), but coming to Prime 4
As @Reese said,
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Before posting platter problems… remember the foil, remember the foil, remember the foil. 
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Cheers Reese what’s the latest firmware? I have 1.3.2