Dual center channel Speakers

dldvision

Novice Member
I want to run dual center channel speakers. I understand that when you remove the jumpers from a nominal 8 ohm speakers, you now have two separate nominal 8 ohm speakers (high and lows). Now I connect those terminals in series so I should have a single nominal 16 ohm speaker.

What is the downside?

The specific speaker is Klipsch RP-504c.

Now I connect a separate nominal 8 ohm speaker in parallel, for example, another RP-504c. From the amplifier's perspective, it sees a nominal 8 ohm speaker?

What is the downside?
 

John7

Well-known Member
If you think about it, the downside is that the tweeter wiring/crossover is designed for a much lower rated power level. You will be effectively passing the power required to drive the woofer through that wiring/crossover - i.e. not advisable and probably won't work! Also the speaker impedance is a TOTAL of both drivers and crossovers - each one separately could have a different impedance.

If each speaker is 8 Ohms, just wire them in parallel to give a 4 Ohm load to the amp or in series to give a 16 Ohm load to the amp.
 

AndreNewman

Active Member
Not quite the whole story.

The tweeter side is connected via the crossover so only (mostly) loads the line for the tweeter frequencies, same for the woofer so it's not just two 16 ohm loads in parallel, it two 8 ohm loads that operate at different frequencies, in parallel, so back to ~ 8ohms again.

The tweeter is usually DC decoupled via a capacitor so not only might you blow your tweeter you would find very little or no output from the woofer.

The final part is it's likely you will need a slight difference in timing between an above screen center and a below screen one, depending on screen size and position so you would need a separate processor out to drive it or at minimum something like a minidsp. Probably the channel EQ would need to be different too, especially if you have dirac.

So try it with separate amps or parallel if your amp is happy with 4 ohms but unless your AVR or processor has capability to process a center height channel, I think you won't find it works well.
Auro 3D does this I think, Trinnov can, maybe others, I gave this a go once many years ago and it sounded horrible.
 

dldvision

Novice Member
Thanks for the information, I really appreciate it.

I recently installed a Sony XBR-AG9 OLED TV with Acoustic Surface + and decided to ditch my sound bar (TV sits only 1/4" off the surface of the stand). I purchased a Klipsch speaker setup without a center channel speaker because the TV has "Center Channel Mode" where the TV speakers are driven by the "Audio System", in my case a new Sony STR-DN1080.

When the speakers arrived, I setup a speaker AB switch and tested my RP-600M book case speaker under the TV against the TV Speakers. It was clear the RP-600M sounded better, at least most of the time, but what sounded best was using both the TV speakers and the RP-600M in parallel. When using both, the sound appears to come directly from the screen and is overall more natural.

I have now ordered a RP-504c center channel speaker and plan to do the same test again. Assuming the same result, my plan is to run the 4 ohm speaker setup from the center channel output of the receiver and hope the receiver handles it. I rarely play at high volumes and will avoid clipping in any case.

Sony, if you are listening, you should have allowed the Zone 2 outputs, most often unused, to mimic any of the 7 standard speakers, then I would be golden! There is mode where Zone 2 uses the same source as Zone 1, but I assume they mimic the left/right channels in this case.
 

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