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Sennheiser HD555 Professional Headphones with Sound Channeling (Old Model)
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From Sennheiser
This report was last updated 5/21/2020.
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Report Info:
Note: We only analyze "reviews" and ignore one-tap "ratings".
Report Card
Pass Overall Grade
FAIL Suspicious Reviewers
WARN Deleted Reviews
WARN Reviewer Ease
WARN Phrase Repetition
WARN Reviewer Participation
PASS Rating Trend
PASS Unverified Purchases
PASS Word Count Comparison
PASS Overlapping Review History
PASS Brand Repeats
PASS Incentivized Reviews
Most Trusted Reviews
Very poor quality! All plastic shattered in 1-2 years! Will ... [Go to full review]
Jan 31, 2018
100%
TRUST
TRUST
- Unverified Purchaser
- Critical Reviewer (avg. rating: 3.9)
Least Trusted Reviews
These were everything and more than I expected. They are ... [Go to full review]
Apr 23, 2007
0%
TRUST
TRUST
- Unverified Purchaser
- Contains repetitive phrases (show)
- Overrepresented Participation (posted 5 Reviews)
- Easy Grader (avg. rating: 4.3)
Analysis Details
Fail Suspicious Reviewers
One-Hit Wonders
70 of the 641 reviewers have only reviewed this product. While this is more One-Hit Wonders than we'd expect to see, the discrepancy in ratings between the One-Hit Wonders and reviewers who have posted more than one review isn't significant enough to rule out the possibility of it being due to random chance.
Never-Verified Reviewers
86 of the 641 reviewers have never written a verified purchase review. The Never-Verified Reviewers have rated this product an average of 4.7 while the reviewers who have written at least one verified purchase review rated this product an average of 4.4. Based on our statistical modeling, the discrepancy in average rating between these two groups is significant enough to believe that the difference is not due to random chance, and may indicate that there are unnatural reviews.
Take-Back Reviewers
188 of the 641 reviewers have had at least one of their past reviews for another product deleted. While this is more Take-Back Reviewers than we'd expect to see, it does not appear to have a significant impact on the overall rating.
Warn Deleted Reviews
We discovered a total of 18 deleted Reviews for this product, with an average rating of 4.6. Even though deleted reviews don't affect the average rating, the fact that action was taken to delete reviews raises some red flags about the integrity of the reviews for the product as whole.
There are a few limitations to keep in mind regarding the Deleted Reviews test:
- We don't have a magic ability to collect every single deleted review; we can only identify reviews as deleted if we collect them on one date and then notice they are no longer visible on a subsequent date.
- We have no information on reviews that were never published in the first place.
- We also don't know why these reviews were removed. It could be action from the platform, personal decision by the review author, part of an entire account closure, even some data error on our part, etc.
Warn Reviewer Ease
The ease score is the average rating for all reviews that a given reviewer submits. The average ease score for reviewers of this product is 4.3, while the average ease score for reviewers in this category is 4.1. While this discrepancy is rather large, it is not quite large enough to rule out the possibility of it being due random chance.
4.3 Product's Average Ease Score
4.1 Category's Average Ease Score
Read more about our Reviewer Ease test.
Warn Phrase Repetition
Reviews that contain one of these phrases are NOT necessarily devalued; read more about how this test works here.
Common Phrases in Reviews:
Show MoreShow Less
11 reviews
(4.5/5)
(4.5/5)
12 reviews
(4.8/5)
(4.8/5)
84 reviews
(4.7/5)
(4.7/5)
87 reviews
(4.4/5)
(4.4/5)
44 reviews
(4.5/5)
(4.5/5)
11 reviews
(4.1/5)
(4.1/5)
6 reviews
(5.0/5)
(5.0/5)
28 reviews
(4.6/5)
(4.6/5)
15 reviews
(4.3/5)
(4.3/5)
32 reviews
(4.8/5)
(4.8/5)
198 of the 641 total reviews for this product use substantial repetitive phrases between them. This is an excessively large percentage which may indicate unnatural reviews.
Warn Reviewer Participation
-
- 32%
- From reviewers with an overrepresented participation
We see the following 1 participation group with a statistically significant greater concentration than what we'd expect to see:In total, we found that 205 reviewers (or 32%) are within an overrepresented participation group. While this is more reviews from overrepresented participation groups than we'd expect to see, these reviews do not appear to have a significant impact on the overall rating.
Pass Rating Trend
-
- 4%
- Created over 9 days
We counted 641 reviews for this product over the span of 5,750 days, an average of 0.1 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 2 or fewer reviews on any given day.
However, we see the following 9 days exceeding this threshold:In total, we found that 28 reviews were created on just 9 days. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
Pass Unverified Purchases
180 of the 641 total reviews for this product are unverified purchases. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
Unverified purchases may be the result of Kindle Unlimited readers, buyers who didn't pay full price, or reviewers who did not purchase the product at Amazon. Read more about our Unverified Purchases test.
Pass Word Count Comparison
-
- 28%
- Have an overrepresented word count
In the graph above, we can see the distribution of review word counts for this product and the expected distribution for this category. We see the following 1 group with a statistically significant greater concentration than what we'd expect to see:In total, we found that 182 reviews (or 28%) are within an overrepresented word count group. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
Pass Overlapping Review History
Reviewers of this product have ALSO reviewed the following products:
2% also reviewed:
SteelSeries QcK Prism RGB Mousepad, Dual-Surface,... by SteelSeries
2% also reviewed:
Zalman ZM-MIC1 High Sensitivity Headphone... by Zalman
2% also reviewed:
Sennheiser Consumer Audio HD 650 - Audiophile... by Sennheiser Consumer Audio
1% also reviewed:
Klipsch IMAGE S4 In-Ear Enhanced Bass... by Klipsch
1% also reviewed:
Koss KSC75 Portable Stereophone Headphones by Koss
1% also reviewed:
Vitamin C Serum for Face with Hyaluronic Acid,... by Foxbrim
1% also reviewed:
Koss Porta Pro Black On Ear Headphones with Case... by Koss
Does not include products
from the same brand
from the same brand
67 of the 641 reviewers have substantial overlapping product review history. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
Pass Brand Repeats
Brand Repeaters
85 of the 641 reviewers have reviewed other products for this brand. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
Pass Incentivized Reviews
On Oct 3, 2016, Amazon prohibited incentivized reviews, however we still test for them since there are still millions in our dataset.
-
- 0%
- Admitted to receiving an incentive
We didn't detect any reviews that used language indicating they were incentivized.
Read more about our Incentivized Reviews test. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.
Read more about our Incentivized Reviews test. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.