What would you do? series/parallel

[henrylrjr]

The post about tapped transformers got me distracted from the path I'm following.

I have an OPPO BDP-95 connected to an Audible Illusions (AI) preamp which is connected to an amp. The amp is connected to speakers in a HT room and to stereo speakers in a different room. All components are in a closet in the HT room.

I plan to set the OPPO to max and find a sweet spot on the AI preamp for the HT room and, very likley, a different sweet spot on the preamp for the other room.

I'll use the OPPO remote control to lower volume, when necessary, while listening in either room.

 

[john k...]

If you have two woofers of impedance X ohms, in series you would have a 2X ohm load. In parallel you would have an X/2 ohm load. If you add an X/2 ohm resistor in series with the woofers in parallel the load will then be X ohms. Now, if the amp puts out Y volts across the load, in the series cars you would have Y/2 volts across each driver. Similarly, for the parallel case, you will have Y/2 volts across the resistor and Y/2 volt across the drivers in parallel, i.e. across each driver. So both configuration will produce the same SPL at a given amp output voltage. The difference will be that in the parallel case with series resistor the load will draw twice the current of that of the series configuration with 1/2 the power being dissipated in the series resistor. In addition, the series resistor will increase Qes, hence Qts, which means that a (sealed) box designed for a specific Qtc would be larger for the parallel/series resistance case, and therefore would have a lower Fc. However, because of the series resistance there could still be some interaction between the drivers due to differences in the back emf if the woofers were not 100% identical (Fs, Qms, Qes, etc). Still, this would most likely be a better configuration than the woofers in series case.

 

[nigelwright7557]

Millions of guitar amps with speakers have been wired series/parallel since they were invented.
I used to use 2 cabinets each with 2 speakers in each wired series in the box and parallel external for many years. Sounded great.
Its good enough for Marshall so good enough for me.