Hi all,
New to this forum, hope this is the right place to ask a question about modifying my new Roland Mobile AC.
Like most Cube amps from Roland (Micro Cube, Cube Street etc) this little amp doesn't have a dedicated line out - yet it has a headphone out which disables the main speaker(s) when in use.
As this is an acoustic amplifier - I don't need this 'practice' function and would instead like to use the headphone out as a line out instead while using the amp as a personal monitor.
Whereas modifying the Micro Cube and some others are quite well documented, I can't find anything regarding the Mobile AC (which has quite a different design to the other Cubes - and technically doesn't belong to the Cube family but the Acoustic Chorus family).
Has anyone disassembled this otherwise terrific little amp - or even better modified it so that the headphone jack doesn't switch off the main speaker when in use?
I'm a professional jazz guitarist - not an electrical engineer... any help would be greatly appreciated! 🙂
New to this forum, hope this is the right place to ask a question about modifying my new Roland Mobile AC.
Like most Cube amps from Roland (Micro Cube, Cube Street etc) this little amp doesn't have a dedicated line out - yet it has a headphone out which disables the main speaker(s) when in use.
As this is an acoustic amplifier - I don't need this 'practice' function and would instead like to use the headphone out as a line out instead while using the amp as a personal monitor.
Whereas modifying the Micro Cube and some others are quite well documented, I can't find anything regarding the Mobile AC (which has quite a different design to the other Cubes - and technically doesn't belong to the Cube family but the Acoustic Chorus family).
Has anyone disassembled this otherwise terrific little amp - or even better modified it so that the headphone jack doesn't switch off the main speaker when in use?
I'm a professional jazz guitarist - not an electrical engineer... any help would be greatly appreciated! 🙂
No, I couldn't find any schematic; but my bandmember and fellow guitarist is a bit of a wiz when it comes to doing mods to audio equipment - so we got it done 🙂
Whereas most Cubes break the ground circuit when the headphone jack is in use and disable the main speaker - the mobile AC does the opposite, it makes a second ground circuit when a headphone jack is inserted and disables the speaker.
After taking the amp apart carefully we used a multimeter to match the different solder point to the tip, ring and sleeve of the 3,5 jack input and found 3 ground points - 2 of which are activated upon inserting the jack.
By de-soldering one of these points we were able to ensure that both the lineout and main speaker can be used at the same time.
Rough sketch
* Ground
* <-- The solder point that we de-soldered and disconnected from the circuit
* Ground
*** (tip, ring and sleeve)
Mission accomplished - the amp can now be used both standalone and as a stage monitor that passes the sound (and Roland's excellent Reverb) to the PA 🙂
Whereas most Cubes break the ground circuit when the headphone jack is in use and disable the main speaker - the mobile AC does the opposite, it makes a second ground circuit when a headphone jack is inserted and disables the speaker.
After taking the amp apart carefully we used a multimeter to match the different solder point to the tip, ring and sleeve of the 3,5 jack input and found 3 ground points - 2 of which are activated upon inserting the jack.
By de-soldering one of these points we were able to ensure that both the lineout and main speaker can be used at the same time.
Rough sketch
* Ground
* <-- The solder point that we de-soldered and disconnected from the circuit
* Ground
*** (tip, ring and sleeve)
Mission accomplished - the amp can now be used both standalone and as a stage monitor that passes the sound (and Roland's excellent Reverb) to the PA 🙂
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Hello Jazzman81 or others, maybe you can help me. I have had a Roland mobile cube for years and use it a lot. I love it, but my only beef besides the line out (thanks!) is that the chorus is not adjustable, just in-off. I think the chorus us too strong and I'd like to be able to adjust it so I can add just a little bit of chorus.
Any ideas on this? I can't find a schematic.
Thanhs!
Any ideas on this? I can't find a schematic.
Thanhs!