Hello,
I'm looking for IEM models to drive with an op-amp with a maximum output current of 45mA (AD4075-2). My source signal is max. 1.5V-peak, so I assume that the ideal load impedance would be 33ohms (1.5/0.045) .
Does it make a difference to have impedance matched cans in general, striving for minimal voltage-to-current conversion? I've read that at the end only power matters. If the cans are low in impedance, the excess of voltage from the amplifier will be converted into current. But I like the idea of listening to a voltage swing that replicates that of the output signal from the amplifier.
I ask this because IEMs are normally very low impedance (ie. 16ohm), it is quite challenging to find anything around 32ohms and maybe I'm giving importance to something that is not really important at the end.
I'm not sure also what the target SPL should be. I guess around 114dBSPL is already painful enough? In that case I would be looking for 96dB/mW IEMs (non-existent). But I'm lost there. Is it better to look for higher sensitivity IEMs to minimize current load on the opamp (which could maybe decrease current noise), or minimum sensitivity IEMs to increase the output current into the monitors (which could translate in higher fidelity or detail).
A lot of assumptions here. All certainties or opinions will be welcome forever.
–Domingo
I'm looking for IEM models to drive with an op-amp with a maximum output current of 45mA (AD4075-2). My source signal is max. 1.5V-peak, so I assume that the ideal load impedance would be 33ohms (1.5/0.045) .
Does it make a difference to have impedance matched cans in general, striving for minimal voltage-to-current conversion? I've read that at the end only power matters. If the cans are low in impedance, the excess of voltage from the amplifier will be converted into current. But I like the idea of listening to a voltage swing that replicates that of the output signal from the amplifier.
I ask this because IEMs are normally very low impedance (ie. 16ohm), it is quite challenging to find anything around 32ohms and maybe I'm giving importance to something that is not really important at the end.
I'm not sure also what the target SPL should be. I guess around 114dBSPL is already painful enough? In that case I would be looking for 96dB/mW IEMs (non-existent). But I'm lost there. Is it better to look for higher sensitivity IEMs to minimize current load on the opamp (which could maybe decrease current noise), or minimum sensitivity IEMs to increase the output current into the monitors (which could translate in higher fidelity or detail).
A lot of assumptions here. All certainties or opinions will be welcome forever.
–Domingo