Please use the search facility on the forum - this topic has been covered a great many times. (I have lost count how many times I have written this...)
From your description it sounds as though your replacement supply does not have a regulated output. It is essential that it does. Otherwise you will most likely damage your SoundBridge. For an M1000 (connectors under the end-caps) this must be 9 volts regulated at a current of at least 1.3 amps (more current capability is OK, but not more voltage). For an M1001 with connections at the back (and M1001s that say M1000 on the front!) this must be 5 volts regulated, at a current of at least 1.5 amps, but again more current capability is OK, more voltage is not.
If you are unclear on whether your supply has a regulated output then do not guess. Use a voltmeter to measure it. If it is supposed to be 9 volts, then if the meter says 8.8, 9.1, or even 9.4, then you can assume that it is regulated. If the meter says 11, or 12 or more then it is not regulated and it must not be used.
Roku M1000, M1001, M2000, R1000, Roberts WM-201, Stream 83i