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TAS2505: Driving 2+ Speakers

Akash Patel
Expert 6245 points
Part Number: TAS2505

Hi team,

We are developing a system that have the potential for up to 8 small speakers (~100 mW). We are looking for a low power speaker amplifier that is able to do drive multiple (2+) of these speakers per amplifier. For example, looking at the TAS2505, are we able to put two (or more) speakers in parallel connected to the SPKP and SPKM pins on the device? What are some concerns that we need to take into account if we do that?

Regards,

Akash Patel

  • 0
    TI__Guru** 109055 points
    Hi Akash,

    The first thing to take into account in this case would be the load impedance.
    The minimum load impedance specified is 4-Ohm. So if two speaker will be paralleled they would need to be at least 8-Ohm. If more speakers are expected to be connected in parallel then the impedance of each one must be higher.

    Best regards,
    -Ivan Salazar
    Audio Applications Engineer - Low Power Audio & Actuators
  • 0 in reply to Ivan Salazar
    TI__Expert 6245 points
    Hi Ivan,

    Are there any concerns with having the speakers in a parallel configuration if we are meeting the minimum load impedance? How does this affect the performance? (i.e. two 8 ohm speakers in parallel vs. one 4 ohm speaker)

    Also are we able to put these speakers in series? I don't see a maximum load impedance parameter in the datasheet.

    Regards,
    Akash Patel
  • 0 in reply to Akash Patel
    TI__Guru** 109055 points
    Akash,

    Driving two 8-Ohm in parallel or one 4-Ohm should be mostly the same.
    There is not a maximum load specified as this won't demand higher current from the amplifier.
    Placing speakers in series could be better with several speakers as this won't demand more current from the device. However the power delivered will be divided between all the speakers connected.
    I think the best would be to do some test to see if connecting several speakers to one driver provides your required performance.

    Best regards,
    -Ivan Salazar
    Audio Applications Engineer - Low Power Audio & Actuators
  • 0 in reply to Ivan Salazar
    TI__Expert 6245 points
    Hi Ivan,

    Do we have an multi-channel low power amplifiers? Perhaps anything with more than 2 channels?

    Regards,
    Akash
  • 0 in reply to Akash Patel
    TI__Guru** 109055 points
    Akash,

    Unfortunately the devices available are only mono or stereo.
    Is digital input an applications requirement? Perhaps you could use some small (DSBGA) analog input amplifiers if size is a constraint.

    Best regards,
    -Ivan Salazar
    Audio Applications Engineer - Low Power Audio & Actuators
  • 0 in reply to Ivan Salazar
    TI__Expert 6245 points
    Hi Ivan,

    Thank you for the quick response. Digital input is not a requirement but we would prefer to use digital if possible. I will look into our DSBGA analog input amps.

    Regards,
    Akash