Sonus Convertible Car Seat (Amethyst)


Sonus Convertible Car Seat (Amethyst)
for children 5-50 lbs. / birth-8 years

Sonus Convertible Car Seat (Amethyst)


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The Sonus Convertible Car Seat offers the ideal fit for both child AND car, at an affordable price. The compact size fits 3 seats across in most mid-size vehicles, while the wider seat base fits a broader range of children. With a weight rating of 50 lbs, and a rear-facing weight rating of 40 lbs, your child can stay rear-facing longer! 


  • 2 Seats in 1: Two Modes of Harness use – Rear-Facing and Forward-Facing

  • Compact Size: Fits 3 across in most mid-size vehicles

  • Wider Seat Base: Ergonomically designed to fit a broader range of children

  • Air-Flow Vents: Built-in ventilation provides airflow to your child, keeping them comfortable during every ride

  • Up-Front Harness Adjust: Central, front access to harness adjuster provides an easy way to adjust child's harness for an accurate, snug fit

Why you'll love it

Go with the Flow...

Rear-facing for infants and when ready, converts to forward-facing to keep your growing child traveling safely and comfortably. Evenflo's Sonus Essential Convertible Car Seat offers a rear-facing weight rating of up to 40 pounds and a forward-facing weight rating of up to 50 pounds. For added comfort, this seat offers a built-in ventilation system that provides traveling comfort for your child through all seasons. Try this seat for a top notch extended-use option at an affordable price.

The Sonus convertible car seat features:

  • Rollover Tested- Evenflo is leading the industry with the development of a dynamic rollover test
  • Air Flow Ventilation System - Offers built-in ventilation system that provides a comfortable seat for your child through all seasons
  • Extended Use- Accommodates your growing child longer with the broadest range of harness adjustments
  • Up-Front Adjust - Easy access harness tension system
  • 5 shoulder strap positions ensure proper fit always


Trusted by Millions of Families for Nearly a Century

Made in USA with US & Global Components

Peace of Mind:

Expiration: 6 years

Warranty: 90 days

Returns: 30 days


Installation Manuals: Browse »

FREE Video Support: Book Now »

Product Details

Child Specs (5-50lbs)


  • Weight: 5-40 lbs (2.3-18 kg)
  • Height: 19-40 in. (48-102 cm)
  • Fit: Top of head is at least 25 mm (1 inch) below the top of the child restraint seat back.


  • Weight: 22-50 lbs (10-22.6 kg)
  • Height: 28-50 in. (71-127 cm)
  • Age: At least 2 years old
  • Fit: The tops of the child’s ears are at or below the top of child restraint seat back.

Product & Shipping Specs

  • Dimensions: 29.0 x 19.0 x 19.0
  • Product Weight: 11.28 lbs.
  • Package Width: 19.13 in.
  • Package Weight: 14.9 lbs.
  • Package Depth: 19.13 in.
  • Package Height: 29.63 in.


Safety Testing

At Evenflo, we continue to go above and beyond government testing standards for car seats.

  • Rollover Tested: Evenflo is leading the industry with the development of a dynamic rollover test.
  • Side Impact Tested:Meets Evenflo’s proprietary side impact standards.
  • Designed and tested for structural integrity at energy levels approximately 2X the federal crash test standard.
  • FMVSS 213: Federal Motor Vehicle Safety Standards for Child Restraint Systems
  • FMVSS 302: Federal Motor Vehicle Safety Standards for Flammability of Interior Materials
  • Certified For Use In Aircraft: When used with the internal 5-point harness this restraint meets FAA Inversion requirements for airplane use.

Use & Care

Use & Care

Read all instructions and warnings on the product, product labels, and instruction manuals before use. Consult your vehicle owner’s manual to determine proper placement of child restraint in your vehicle and familiarize yourself with your vehicle’s components.

Browse Instruction Manuals »

Cleaning Instructions
  • DO NOT lubricate or immerse in water any part of this child restraint, unless rinsing is permitted
  • Plastic and metal parts may be wiped clean with mild soap and water and dried with a soft cloth. Do not use abrasive cleaners or solvents.
  • Take care not to damage any labels.
  • The harness can be wiped clean with mild soap and water. Allow harness to air dry.
  • Machine wash the seat pad separately in cold water, delicate cycle. Tumble dry 10 to 15 minutes on low heat.
  • Periodically inspect and clean the restraint's crotch buckle of food, liquids, and other debris to ensure proper latching. Place the buckle in a cup of warm water and gently agitate the buckle back and forth. Press the red button several times while the buckle is in the water. Do not submerge the harness strap. To avoid damage to the buckle, do not clean the buckle with soap or detergents and do not use a lubricant.

Evenflo Sonus™ Convertible Car Seat Product Tour

Keep your growing child safe and comfortable in Evenflo's Sonus convertible car seat. With a rear-facing weight rating up to 40 pounds and a forward-facing weight rating up to 50 pounds. For added comfort, this seat offers a built-in ventilation system that provides a comfortable seat for your child through all seasons. At Evenflo, we continue to go above and beyond government standards. Designed and tested for structural integrity at energy levels approximately 2x the federal crash test standard AND tested to simulate a side impact event and rollover event.

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SONUS AMETHYST is rated 4.4 out of 5 by 92.
Rated 4 out of 5 by from Good budget car seat, great for travel--it's light Bottom line: It's a good, lightweight budget seat that requires the seat to be uninstalled for manual adjustments and has a fixed backrest height so you'll need a separate booster seat when your child outgrows this. This is one car seat where you have to read the manual to make sure it's adjusted or installed correctly. The harness belt itself also has two different lengths for the newborn-smaller baby stage vs toddler stage. You do need to uninstall the car seat to switch harness belt lengths or move the shoulder strap up/down the different height settings. There are two buckle settings that place the buckle closer or farther from the baby. To change the latch belt from rear-facing to forward-facing installation, you need to pull the seat cover off from the bottom and over the cup holders first. One thing that took some getting used to was the harness belt is a single strip that goes over one should loops through the seat bottom and back over the other shoulder. If you pull on one strap, the other one tightens. I learned to hold the chest clip extended away from the child while tightening the seat belt to keep both sides even. The harness belt did not come with shoulder pads to keep the belt from pinching the little one's neck. I found that it takes more depth to be installed rear-facing compared to the other seats I have, like an extra 6+ inches compared to the Evenflo Symphony DLX. The Symphony DLX adjusts with a swivel of the seat whereas the Sonus adjusts with a kind of built-in angle wedge that flips out on the bottom. Between this form of angle adjustment and the fixed backrest height, it extends out pretty far. I had to install it on the passenger side to allow for taller drivers. The memory foam-like seat padding is nice and a good thickness. The structure of the seat is more open, ie the side panels flare out rather than forward on the backrest, so it's easier to get the child in or out. I recommend this car seat for travel because it's much lighter than others. It is lighter weight since there's no steel bar/framing. It is marked as compatible for airplane use. My little ones can easily undo the airplane seat belts, so I feel safer having them in this seat on the plane.
Date published: 2020-05-16
Rated 5 out of 5 by from I'm in love with this carseat! We had bought this for our son and it has been the best carseat we have ever gotten! It's super comfy easy to install and my child grew with it! I would love to be able to buy more from this brand!
Date published: 2020-04-09
Rated 1 out of 5 by from VERY difficult to fasten! We bought 2 of these for 2 different vehicles and in both cases, it was extremely difficult to get both seats tight enough for there to not be too much play. They still feel much looser than the old car seats we originally had in our cars. Also, I regularly (once a month) have to retighten the seats as they seems to loosen after some use. The straps to fasten the kids into the seats are also VERY difficult to tighten. I have to lean into the seat with all of my body weight (190lbs) and pull HARD in order to get the straps tight enough for my kids to be fastened in. This of course has resulted in one of the seats' armrest snapping off after 4 months of use. Lesson learned, you get what you pay for.
Date published: 2020-03-31
Rated 2 out of 5 by from bad harness i got this carseat as an extra seat for my husbands car and it is so difficult to adjust the harness especially in the lap area the 1st time we used i pinched my sons leg because as you clip one side the other side tightens and so on.
Date published: 2020-02-18
Rated 4 out of 5 by from Missing flip foot I need a replacment “flip foot” for this car seat. It’s been out of stock for a while but I need it desperately. The car seat is useless to me right now without it...
Date published: 2019-11-21
Rated 2 out of 5 by from This seat passes all the same safety standards as the rest. I'm just rating it two stars because it was difficult to install and takes up a very large amount of room rear facing, I only bought it because it was on sale and ended up returning it anyways.
Date published: 2019-08-07
Rated 5 out of 5 by from My son loooves this carseat, he fits comfortably and it fits our van with our other 3 children. The straps to buckle him in are easily adjustable that I love. We will see if the cupholders will come in handy in the near future. Great purchase and will suggest it other mommies
Date published: 2019-05-23
Rated 5 out of 5 by from Love the color! this product is exactly what I wanted: a larger seat for my 16 month old and the color just makes me so happy!
Date published: 2019-05-07
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