The Sonofresco 3-in-1 System is built on top a Sonofresco's 1lb air roaster chassis. However, the similarities end there. Internally, the 3-in-1 System has been completely reengineered in order to provide a Balanced Airflow Design to three individual samples, essentially mimicking the airflow within a drum roaster.

The roast chamber itself is divided into three equal sections by a stainless steel insert giving you the ability to roast three samples at the same time under the exact same roast profile. The unit's controller continually monitors temperature and self adjusts to stay within 1 °C of the roast profile. Once the final temperature has been reached, the system automatically enters cool-down mode.

What does this mean? You can now roast three samples at once in 12 to 15 minutes with practically zero supervision. Sample roasting has never been this easy or this affordable.

Significant advances have been made to manage the heat distribution in the Sonofresco 3-in-1. These advances optimize the balance between convection and conduction heating that allows the 3-in-1 roaster perform as well typical drum roasters available on the market today.

Factory balanced airflow allows the user to capture all of the characteristics that the bean embodies and protects the clean roast requirements demanded of a true sample roaster. If the airflow is too fast the net effect is fluidization of the coffee. The beans are lifted too high and are allowed to float alone in the airstream with less contact with other beans within the roasting chamber. This results in a roast which is dried out. Conversely, too little airflow causes the beans to settle - concentrating the heat on one side of the bean resulting in uneven browning. Balancing airflow is critical. Sonofresco's air balancing creates a bubbling effect which allows the beans to get the right balance of airflow passing around the beans while allowing adequate contact to support effective heat conduction.

The novel design of the Sonofresco 3-in-1 allows users to prepare up to three roasts simultaneously. The net result is three sample roasts in the same time, energy and effort required to perform a single roast on other sample roasters. An added benefit, the three way divider can simply be removed allowing you to run the machine as a standard roaster yielding one net pound of roasted coffee.

When roasting samples, the beans and roast profiles used are not the only factors that can affect the quality of the results; differences also exist in the ability of some sample roasters to maintain consistent temperature within and between roasts. If the temperature of the roasting chamber is not uniform it can have a significant impact on results. The Sonofresco 3-in-1 actively monitors and controls the temperature of the roaster to ensure that the roasting profiles are traced with precision - a feature not found in other, more expensive, sample roasters.

Maintaining uniform heating within the roasting chamber is inherent in the design of the Sonofresco 3-in-1. While the single barrel and integrated roasting chamber partition plays a large part in creating this uniformity, the innovative Balanced Airflow Design ensures that this translates to even degree of roast across all the beans