oldhvymec - You are funny, thanks. I'm going to actually do some "grade school" math on a 2nd order low-pass filter. I will connect them in series first, then in parallel and the numbers should speak the truth, unless my math is bad. I will share the numbers once I'm done! Your analogy of a 103dB speaker also got a chuckle out of me. 103dB @ 1watt,1meter distance is not that loud, really. Break glass you're flat out wrong, even 1000watts, that only 133dB. Jet engines at a distance of more than 100 feet are 140dB, that doesn't break glass. 123dB @ 100watts is loud, but rock concert levels and threshold of pain are about 130dB. While I don't listen to music at those levels now, I wish I NEVER did...
Chained speakers signal connected in series
I have two pairs of the same model speakers (Tannoy SGM 10B) connected in series to two monoblock amplifiers. The left channel amp drives two speaker cabinets on a left (speakers L1 and L2) and the right channel amp drives two speaker cabinets on a right (speakers R1 and R2).
The positive speaker output of the left amp is connected to a positive post of the first speaker L1(+). Then the negative post of the same first speaker L1(-) is connected to positive post of the second speaker L2(+) with the its negative post L2(-) connected to the amplifier's negative speaker output.
AMP(+) > L1(+)
L1(-) > L2(+)
L2(-) > AMP(-)
Both left channel speakers have a cross-overs build in. Does the audio signal that the first speaker L1 receives from amplifier is any different from a signal the second speaker L2 receives from speaker L1? Does the crossover of the first speaker L1 modify the output signal that goes to a second speaker L2?
The positive speaker output of the left amp is connected to a positive post of the first speaker L1(+). Then the negative post of the same first speaker L1(-) is connected to positive post of the second speaker L2(+) with the its negative post L2(-) connected to the amplifier's negative speaker output.
AMP(+) > L1(+)
L1(-) > L2(+)
L2(-) > AMP(-)
Both left channel speakers have a cross-overs build in. Does the audio signal that the first speaker L1 receives from amplifier is any different from a signal the second speaker L2 receives from speaker L1? Does the crossover of the first speaker L1 modify the output signal that goes to a second speaker L2?
- ...
- 27 posts total
I did some testing this morning by connecting and disconnecting the speakers from the amps. The speakers connected in series (two speakers per channel chained) sound different from what they sound when they are connected separately (single speaker per channel). Interesting, that while both speakers in series produce a duller sound, one of the speakers degrades the sound more than another. Unless it is OK to connect them in parallel I would have to loose one pair from the system as it appears a single speaker per channel sounds way better. |
Yes, OP that is basically what I said. One speaker connected to each amplifiers output will sound better than two, whether it's in series or parallel. If you connect them in parallel, if your amp can handle it, it will be about 3dB louder but NOT as clear, just like in series. For those other Agoners that said the crossover frequency will change when connected in series, I have done the calculations and the crossover frequency DOES NOT change. I will post diagrams later, but if you want to do your own calculations, be my guest. Can we agree that Rt equals 16ohms in series? Can we agree that Lt = L1 + L2 in series? Can we agree that 1/Ct = 1/C1 + 1/C2 in series? If it's yes to the above, then simply plug those numbers into the equations. f = R/2πLQ and f = Q/2πRC. Both will come out the same with a very small error depending how many decimal points you take it out too. Happy listening to all. |
Personally: I don’t find the idea that an audio signal, after passing through a system* when fed into a subsequent and identical system, in series, might just sound a little different, the LEAST bit surprising. They’re rated at 6 Ohms, so: can only be run in parallel (a 3 Ohm load, but varies, fed a music signal), with an amp that can handle a 2 Ohm load, with stability (check your amp’s specs). *Referring, specifically, to the TANNOY SGM 10B Super Gold Monitor Speaker; comprised of two open-air-core inductors, two iron-core inductors, a bunch of wire wound resistors, a couple voice-coils (resistance, inductance and back EMF) and an electrolytic. |
Regarding those voice coils, impedances and such: http://education.lenardaudio.com/en/05_speakers_3.html The chart shown: for an 8 Ohm (nominal) speaker Note the lower freq impedance dip. |
- 27 posts total