Looks like Best Grand Music is a Chinese company that is cloning these guitar amps. ... ... Anyway, read about Dumble and you'll find that they are one of the most sought after custom made guitar amps. Cloning them for mass production strikes me as somewhat of a counterfeiting operation... (??)
Building products similar to others' products seems to be a common enough business practice. Just look at Ampeg's new Rocket Bass amps compared to the Rumbles! But, in this case, some more obvious re-labeling directly on the product would seem to be more "above board." At least the product description on the website states that it is cloned, which is a step in the right direction from counterfeiting.
"Product Attributes :
Dumble Amp Combo 20W 50W, Overdrive Special clone 20W, Dumble ODS head, custom guitar amplifier, guitar amplifier tone, Grand amp, Dumble Steel String Singer clone, SSS50, SSS100, SSS20, ODS20, ODS50, Handwired amp OEM, point to point guitar amplifier, Marshall style JTM45, JCM800, Plexi50 Heads, Fender 5F2A Style Champ, 5E3 Combo, 57" Twin 2*12 speaker combo, Guitar amp OEM factory, Chinese guitar amp factory, guitar amp combo, guitar studios"
Dumble Amp Combo 20W 50W, Overdrive Special clone 20W, Dumble ODS head, custom guitar amplifier, guitar amplifier tone, Grand amp, Dumble Steel String Singer clone, SSS50, SSS100, SSS20, ODS20, ODS50, Handwired amp OEM, point to point guitar amplifier, Marshall style JTM45, JCM800, Plexi50 Heads, Fender 5F2A Style Champ, 5E3 Combo, 57" Twin 2*12 speaker combo, Guitar amp OEM factory, Chinese guitar amp factory, guitar amp combo, guitar studios"
... ... I wonder if the OP is aware (or cares?) that there are special combo amps dedicated for bass guitars? ... ...
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Little bit more than the 
