Pioneer SX-1050 speaker problems

Try using the low cut filter and see if that helps!

Good choice of receiver!
Please check your turntable for proper VTA/VTF and azimuth. Chances you may be getting rumble that you need to tame. Use 30Hz filter button on and Tone off.
For heavy bass you should purchase a subwoofer. There are plenty of them on the budget that will satisfy your bass urge.

Perfect advice from czarivey. It is not unusual to have woofer pumping from poorly isolated and /or improperly setup turntables.

I have a SX-1050 in my vintage setup. Engaging the 30 hz filter should address the issue unless you have a wicked feedback loop going. Loudness off. Then try the 80hz filter. If that does not solve it, then better vibration isolation and/or a different location for your turntable is indicated.

I find that my matching Pioneer SG-9500 EQ (~$100) does a much better job of providing that vintage driving bass sound than the SX-1050’s tone controls and will allow you to more precisely adjust around your woofer pumping issue.

Pioneer HPM-100s are a great match for the SX-1050 and are awesome in the bass. As Reuben recommends, the Infinity speakers that use the Watkins Dual-Drive woofer are a great choice too but the impedance is a harder load for the receiver to drive. I have both the HMP-100s and the original Watkins WS-1a speakers with the Watkins Dual-Drive woofers and both sound great with lots of bass from the SX-1050, but I prefer the HPM-100s for rock and blues.

Dave

A few options that I can think of...
If your a bass head and like to crank...
Cerwin Vega,  if you want a bit more refinement
Klipsch and if you want to stay in big boy territory
Legacy...... or add a subwoofer and cross your Dali's so that they see 100hz and above and let the sub do the bass duties.
I hope this helps, Tim

I had the same fluttering/pumping woofers in my system and no amount of placing the turntable, different platforms and shelving helped.  I ended up buying a KAB rumble filter and the problem has vanished.  I can not hear any negative effects.