Let's say that you have a loudspeaker with 3 dive units: high, mid and low but with one pair of terminals.
There will be 3 sets of filters HF, band pass for mid and LF.
Is it safe to say that each filter is separate from the others but have common connection?
In other words, can cutting the input to each filter and wiring to a pair of terminal allow for tri-wiring (or tri-amping)?
Or can there be filter topoligies that won't allow that due to shared components between on or more filters?
There will be 3 sets of filters HF, band pass for mid and LF.
Is it safe to say that each filter is separate from the others but have common connection?
In other words, can cutting the input to each filter and wiring to a pair of terminal allow for tri-wiring (or tri-amping)?
Or can there be filter topoligies that won't allow that due to shared components between on or more filters?
You should not have common grounds on the three power amplifier connections.
With the usual parallel crossover, separate each driver's crossover "ground" connection to the black binding post,
and add an extra black post per driver, so each driver is completely independent of the others.
There are certainly some crossovers that interconnect parts for two or more drivers, and this won't work.
This also won't work for a series type crossover.
With the usual parallel crossover, separate each driver's crossover "ground" connection to the black binding post,
and add an extra black post per driver, so each driver is completely independent of the others.
There are certainly some crossovers that interconnect parts for two or more drivers, and this won't work.
This also won't work for a series type crossover.
Last edited:
Ok a quick search. I can see how the 3-way circuit below can be split into 3 separate filters for tri-wiring/amping.
like this:
now to find an example of crossover that cannot,
like this:
now to find an example of crossover that cannot,
here is an example that is not so straightforward. Now I don't know if this is this is valid circuit but I certainly am missing the purpose of the components hightlighted by the yellow box - what effect do they have on the speaker drivers other than loading the amplifier?
Unfortunately I don't but below is a photo - it is PMC twenty5 26. 3-way with one pair of terminals
compare to PMC Twenty 26, also has 3 way but with 3 pairs of terminals.
The Klipsch AA crossover.
Note that the 13uf cap is shared by the squawker and the tweeter.
I have my LaScalas bi-wired with the two horns sharing one set of cables.
Pete
Since you have the schematic, we know it can be done. You may have to cut some tracks or lift some leads. Let us know if you have any problems.
That series RLC does not directly affect the speaker system, but presents the amplifier with a more level loading.
Not quite, I have found photos of the two crossovers. Long story but I may have access to the single terminal crossover to reverse engineer it. It may be that the older model's crossover is compatible with the later.
As an aside, I'm looking into active crossover as an option. The 3 filter frequencies can be set but I don't know the attenuation for each speaker driver.
If the active crossover is not set according to the acoustic properties of the speakers then it will likely sound worse than the one in the photo. With any crossover you need to account for the design and for the drivers, either by measuring them and designing a new crossover, or by copying the existing passive crossover.
yes, post #6 is mine but that was an example after a search on the internet of a 3 way crossover that I can see how to separate the filters. It is not schematic for the crossover I am looking to modify.
Regarding the Klipsch. 2 way is easy to split but 3 way requires component changes due 13 uF capacitor being shared by mid and tweeter. It's a long time since I did any analogue electronics calculations ( I'd probably use a circuit simulator ) - but a separate 3-way circuit would look something like this - the values for the capacitor highlighted need to change and possible addition of resistors.
13 uF and T2A set the cut off frequency but the current that was drawn by the tweeter will now be going to the mid; adding a resistor between input and 13 uf would limit that but now alters the mid cut off frequency.
Originally 13 uf and 2 uF were in series so is replaced by 1.7 uF but again a resistor is needed to prevent the current that would have gone to the mid current going to tweeter.... which may/will affect the cut off frequency. (DC stuff is so much easier!!)
Please feel free to correct - it's how I will learn 🙂
13 uF and T2A set the cut off frequency but the current that was drawn by the tweeter will now be going to the mid; adding a resistor between input and 13 uf would limit that but now alters the mid cut off frequency.
Originally 13 uf and 2 uF were in series so is replaced by 1.7 uF but again a resistor is needed to prevent the current that would have gone to the mid current going to tweeter.... which may/will affect the cut off frequency. (DC stuff is so much easier!!)
Please feel free to correct - it's how I will learn 🙂