If you wire the 4drivers in series parallel then the effective impedance is 8ohms.
Each speaker will get an equal share of the power delivered, i.e. a maximum of 100W of unclipped sinewave.
A single driver with 100W of input will produce an SPL figure at the LF you require.
Two speakers each fed with 100W will give SPL + 6dB
Four speakers each fed with 100W will give SPL + 12dB
Your 400W amp feeding 4off 8ohm drivers, wired as an 8ohm load, will sound as loud at LF as a 1600W amplifier driving an 8ohm speaker, if it could survive.
You will be asking each driver to handle a maximum of 100W. They should be reliable and loud.
Personally I would use four amplifiers each rated at 100W or so into 8ohm and power each driver individually. You get the same volume (SPL) of 1600W driving a single 8ohm speaker and you have resilience in your system. If one amp or one speaker breaks you still have three other bass channels working for your audience.
Each speaker will get an equal share of the power delivered, i.e. a maximum of 100W of unclipped sinewave.
A single driver with 100W of input will produce an SPL figure at the LF you require.
Two speakers each fed with 100W will give SPL + 6dB
Four speakers each fed with 100W will give SPL + 12dB
Your 400W amp feeding 4off 8ohm drivers, wired as an 8ohm load, will sound as loud at LF as a 1600W amplifier driving an 8ohm speaker, if it could survive.
You will be asking each driver to handle a maximum of 100W. They should be reliable and loud.
Personally I would use four amplifiers each rated at 100W or so into 8ohm and power each driver individually. You get the same volume (SPL) of 1600W driving a single 8ohm speaker and you have resilience in your system. If one amp or one speaker breaks you still have three other bass channels working for your audience.
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