Phil Jones Double Four Plus BG-80 RD

Es el amplificador por excelencia para contrabajo y bajo eléctrico según mi experiencia. Para estudiar en casa, con una calidad de estudio al mas mínimo volumen. Ideal para actuaciones en locales medianos, cubre todas las necesidades, también con una batería puedes usarlo en la calle o terrazas con música al aire libre en directo y poner también vía bluetooth musica de fondo para estudiar o acompañarte sin enredos de cables y todo en 5 Kg de peso que lo llevas en una mochila en metro sin molestar a nadie.

I was looking for a lightweight combo amp through which to play my double bass, fitted with a Realist Copper Head pickup, and read some good reviews of this amp (albeit from bass guitarists). It certainly is very lightweight and portable (it fits really well in an Accu-Case AC-115 Soft Bag). I was impressed by the claims made about the very small speakers and the power (90 watts, apparently). However the reality for me was intense disappointment - using the amp without a pre-amp resulted in a lot of distortion at not very high audible volume. With a pre-amp (Fishman Platinum Stage) I could get some distortion-free sound but the volume remained low.
I thought this amp would be a more portable and more powerful alternative to the Harley Benton AC60 pro - it is lighter but that's it. This amp is also extremely expensive for what it is. I thought that at that price I'd be getting quality equipment that fits my needs but it doesn't. As I'm playing an acoustic double bass, I don't need an amp to practise alone. I need an amp to practise with a small combo and this doesn't really add much to the acoustic sound of the instrument in terms of volume before it distorts.
I don't know how this works with a bass guitar (for which it was designed) so only take my comments onboard if you're looking for an amp for a double bass.