KDP categories · Top KDP authors
J P Carl: Amazon KDP author data
As of Nov 6, 2026, J P Carl has 14 books on Amazon, 5 of them on a best-seller list in the last 30 days (best rank #9), mostly in Hearing Problems, Speech & Audio Processing, Digital Audio, Video & Photography.
| Median price | $9.99 |
|---|---|
| Price range (middle 50%) | $9.99 – $16.99 |
| Median reviews | 1 |
| Total reviews | 1 |
| New books (30 days) | 5 |
| Breakout books (30 days) | 3 |
What stands out
- Median price $9.99, 39% below the median of their main category, Hearing Problems.
- 5 new books in the last 30 days, 3 of them broke into a Best Sellers list.
J P Carl's best-ranked books
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The OTC Hearing Aid Handbook: How to Choose, Fit, and Master Modern Over-the-Counter Hearing Aids and Earbuds Without Overpaying
by J P Carl
- Price$8.99
- Reviews-
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The OTC Hearing Aid Handbook: How to Choose, Fit, and Master Modern Over-the-Counter Hearing Aids and Earbuds Without Overpaying
by J P Carl
- Price$16.99
- Reviews-
-
THE OTC CGM HANDBOOK: The Complete Guide to Dexcom Stelo, Abbott Lingo, and Decoding Your Blood Sugar for Metabolic Health
by J P Carl
- Price$9.99
- Reviews-
- Published2026-08
-
RingConn Gen 3: The Complete User Guide: Master Every Feature, From Setup to Vascular Health — No Subscription Required
by J P Carl
- Price$0
- Rating3.0
- Reviews1
- Published2026-06
-
CPAP Made Simple: Stop the Leaks, Read Your Data, and Actually Sleep
by J P Carl
- Price$0
- Reviews-
- Published2026-06
-
Garmin Fēnix 8 & 7 Pro: Das komplette Benutzerhandbuch: Das Feldhandbuch für Kartennutzung, Akku-Optimierung, Trainings-Biometrie und Fehlerbehebung in der Praxis (German Edition)
by J P Carl
- Price$0
- Reviews-
- Published2026-09
-
The PEMF Device Handbook: An Independent Guide to Choosing, Testing, and Using At-Home Pulsed Electromagnetic Field Therapy
by J P Carl
- Price$0
- Reviews-
- Published2026-09
-
What Your Sleep Test Really Means: A Practical Guide to AHI Scores, Sleep Apnea Severity, and Choosing Your Next Step
by J P Carl
- Price$0
- Reviews-
- Published2026-09
-
Oura Ring 4: The Complete User Guide: How to Choose Your Size, Master Sleep & Recovery Metrics, Optimize Battery Life, and Get Maximum Value from Your Smart Ring
by J P Carl
- Price$0
- Reviews-
- Published2026-09
-
Garmin Fēnix 8 & 7 Pro: The Complete User Guide: The Field Manual for Mastering Maps, Battery Optimization, Training Biometrics, and Real-World Troubleshooting
by J P Carl
- Price$0
- Reviews-
- Published2026-09
Main categories
FAQ
How many books does J P Carl have on Amazon?
KDPTop tracks 14 of their books; 5 made an Amazon list in the last 30 days.
Which categories does J P Carl publish in?
Their books chart most often in Hearing Problems, Speech & Audio Processing, Digital Audio, Video & Photography.
How does J P Carl price their books?
The median price is $9.99; half of the books cost $9.99–$16.99.
Has J P Carl released new books recently?
5 new books in the last 30 days, 3 of which reached a Best Sellers list.
About this data
Data comes from KDPTop's daily crawl of Amazon's public Best Sellers pages; medians use the latest list. The opportunity score (0–100, higher is easier to enter) combines the review barrier, the share of low-review books, list turnover, new-release share and price.