To connect the BluBOX to the AMP1, both instrument cables and speaker cables can be used, depending on the configuration. Here you can find out which cables you should use for which application:

No loudspeaker or load box in the game: patch cables allowed

The AMP1 has the enormous advantage that it can be operated without a payload, i.e. without a loudspeaker or load box, despite the tube in the power amplifier. The best sound results are obtained by connecting the SPEAKER OUT of the AMP1 to the SPEAKER LEVEL IN of the BluBOX. If no loudspeaker is connected to the THRU of the BluBOX in this scenario, the AMP1 and the BluBOX can be connected with a normal instrument cable/patch cable.

Loudspeaker or load box being used: speaker cable

However, if a loudspeaker or a load box is connected to the THRU of the BluBOX, speaker cables should be used for both cable runs (i.e. from the AMP1 to the BluBOX and from the BluBOX to the loudspeaker), because in this case power flows - and in case of doubt up to 100 watts of it!

Of course, this also applies to connecting the BluBOX to other amplifiers, especially to tube amps, where a loudspeaker box or a load box must be connected to the THRU of the BluBOX. Here, too, please only use speaker cables for all cable runs.