Some very low sounding bass reeds!

[Dingo40]

This player ( Bengan Jansson) appears at first to be a musician doubling as a stand up comedian (à la Victor Borgé) but if you keep listening you will hear his accordion has some unusually deep sounding bass reeds:

 

[JIM D.]

His box is equipped with a Helicon set of bass reeds.

Helikon bass reeds | Bradford Accordion Band

Clsoe-up of Helikon reeds | Bradford Accordion Band

 

[Dingo40]

Thanks, Jim!
They're extra large?
They make an impressive sound

 

[Morne]

Not sure about the terminology being used here. What is generally called helikon/helicon bass, at least on the European side, is this:

HELICON BASS | HARMONIKAS s.r.o.

HELICON BASS - HARMONIKAS s.r.o.

www.harmonikas.cz

Those are compound reeds where a high note opens along with a low note. The 2 reed tongues share a valve because the high note helps the low note start. Those definitely won't be present on a Hohner Gola with free bass, as in that video, as that would affect your free bass voicing.

What is shown in those Bradford links is what is generally referred to using the German term "winkelbass" (winkelbaß).

 

[debra]

The player has a Hohner Gola. These do not have Helicon bass reeds, otherwise they could not play single L reed.
The Gola, like most full-size convertor instruments has the bass going down to E1. It has pretty large bass reeds, but nothing abnormal. Russian bayan bass reeds are larger (but the notes also go down to E1).
The lowest reeds that are produced are C1, and these are used in a bass accordion.

 

[Dingo40]

Thanks for your insights, guys!