Hi.
I think I read my brain into a corner and am just stuck trying to understand what happens when you wire two DVC Drivers together in series-parallel and if you can do this from a single amp channel.
This is not about the impedance implication. I get that. (A single DVC 4 ohm Driver; in series becomes 8 ohms, in parallel becomes 2 ohms. 2 DVC 4 ohm drivers in full parallel become 1 ohm, in series parallel stays 4 ohms, and in full series would 16 ohms.)
Many diagrams I see show simply wiring each DVC Driver in series and paralleled from the Amp. (So each D4 Driver becomes 8 ohms and then the impedance is halved by paralelling the Amp signal. OK, I get that.
Alden, however, doesn't show Series-Parallel wiring like that, rather he discusses using 2 amp channels to connect the two drivers. One option being Coil(A) in Driver 1 wired in Series to a Coil(A) in Driver 2 powered from Ch1, and then Ch2 powering the other Series of Voice Coils(B) in each Driver. His other example for Parallel wiring has Ch1 powering VC(A) of Driver 1 and 2 and Ch2 powering VC(B) of each Driver.
In each of Alden's examples: Qes is halved; Vas, Sd and Pe is doubled.
In the Series example, Re and Lvc is doubled and he states that SPL will be +6dB.
In the Parallel example, Re and Lvc are halved and he states that SPL will be +12
What happens to each of those parameters with the Series Parallel wiring from a single Amp channel?
In my mind, the first set of statements hold true, re: Qes, Vas, Sd and Pe. But if Re doesn't change then it would stand to reason that Lvc wouldn't either.
Is there an SPL bump?
To me, there should be, however Dickason describes a combination of Series and Parallel wiring differently but doesn't seem to get into DVC configurations.
And so I find myself confused as to what works and why? Which should one choose for what purpose?
Any help clarifying this will be much appreciated.
Thanks!
R