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Sennheiser HD 660S 2 Open-Back Audiophile Headphones

Sennheiser

Sennheiser HD 660S 2 Open-Back Audiophile Headphones

$433.28

at Amazon

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We are not ready to call this price.

We check every 3 hours but write a price down only when it changes, and we publish a verdict once 10 different days carry a recorded price. This one has 2, so how soon depends on how often the price moves, not on how often we look. If it is still $433.28 on October 1, this box will say so — a price that has held for two weeks is an answer too.

Every change we recorded

Every row is a price we saw change. We write one only when a price actually moves, so a gap here means the price held.

WhenRetailerPriceChange
· todayAmazon$433.28−$3.96
· todayAmazon$437.24+$3.96
· todayAmazon$433.28−$3.96
· todayAmazon$437.24+$3.96
· 3d agoAmazon$433.28first seen

Where to buy

RetailerPriceHeld forThat store's 90-day lowChecked
Amazon$433.28changed today—3h agoGo

Prices checked every 3 hours. “Held for” is how long that retailer has been charging this price. A hidden price is one we cannot re-confirm recently enough to publish. Delivery is counted only where we have read the retailer’s own figure; where we have not, the total says so instead of assuming it is free.

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The evidence

One line: the best price any tracked retailer charged, per day.

Prices we recorded ourselves. Usual is the price on the typical day, with limited-time deals left out.
PriceNowLowestHighestUsualDays recorded
New$433.28$433.28 on Sep 14$433.28 on Sep 14$433.282
Sold by Amazon—$433.28 on Sep 14$433.28 on Sep 14—2

Tracking since September 14, 2026 · 2 / 10 days recorded

We do not draw a chart under 10 days of prices. With four days every product is trivially at its lowest recorded price, and a chart that says so is worse than no chart. Check back once the record is long enough to mean something.

#270 of the 294 Headphones we track, by Amazon sales rank.

Sales events

Next on the calendar: Prime Big Deal Days, October 6. We keep checking this price through it and report here what it did.

What it is

7 attributes published by the retailers we check, in their words. We record prices; these we pass on.

Size
Medium
Color
Black
Weight
0.66 pounds
Dimensions
3 × 7 × 7 inches
Model
700240
Released
February 2023
Warranty
2 year manufacturer

Cheaper in Headphones, and what changes

Things we track on the same shelf for at least 10% less than $433.28, with the attributes the retailers describe differently. Their words, not our judgement — we record prices, we do not test products.

Others we track in Headphones

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