I have owned quite many quiet canister vacuum cleaners. There is some of them and comments.
Electrolux Ultraone Z8810:
Extremely quiet, soft tone and very powerfull (425 Airwatts). I sold it when I needed the money. Still greatly regret selling it. Best vacuum I have had.
Bagless Electrolux UltraPerformer:
A bit loud, but not bad. Powerfull (330 Airwatts) Some high pitched tone. I sold it.
Philips PerformerPro FC9193/01:
Quite quiet and soft tone, but because it's huge suction (over 500 Airwatts) medium power level is more than enough then it comes very quiet. Nowadays my parens have it.
Samsung Silky Ego Green:
Good suction (300 Airwatts) and very quiet too. Although motor had some weird "cheap motor" tone. Sold it.
Old AEG Vampyr 402:
Very soft ear pleasing tone and quite quiet. Good suction and large bag.
Old Volta U258:
Soft tone and quite quiet. Slightly louder than AEG. Good suction and large bag also. Excellent build quality.
Old Vorwerk Upright VK 117:
My loudest vacuum. Dirty fan design produces nice airflow, but suction is a bit poor.
My cousins Dyson DC23:
Very loud and high pitched scream. Suction ok.
