Let’s have a look at what’s inside a “simple 3 way analogue active crossover”. Source: Simple 3-Way Active Crossover Circuit Diagram | Circuits Diagram Lab If we trace the signal path from the input to the midrange output we can see that it goes through IC1, IC4A, IC4B, IC5A, IC5B, IC7A. Looking at the parts list for this circuit we can see that that’s 1 x TL071 and 5 x TL072’s. If we then look at the Texas Instruments Functional block diagram on page 26 of their TL07xx series Data Sheet: http://www.ti.com/lit/ds/symlink/tl071.pdf we can see that the signal passed through something of the order of 8 transistors in each TL071 or TL072 op amp. This means that this active crossover adds 48 active amplification devices (transistors) to the signal path! For reference purposes, passive crossovers add 0 active amplification devices to the signal path. For further reference purposes, my Phillips CD753 CD player has a DAC chip and then an analogue section that consists of half an op amp per channel. So let’s call that 4 active amplification devices. In my main system I have a stepped attenuator (passive) pre-amp with 0 active amplification devices and then a SET amplifier with 4 active amplification devices (2 x valves and 2 x transformers) in the signal path. If I were to use a solid state integrated amplifier I’d have something of the order of 8 active amplification devices in the signal path, in addition to the 4 from the CD player. My conclusion from this is that when comparing active to passive crossovers, one should be aware of the SHOCKLINGLY HUGE number of amplification devices that active crossovers may add to the signal path. OK that was one example of a 3 way active crossover. In a 2 way 4th order active crossover we can expect to have 4 op amps (c32 transistors) in the signal path. Whilst a 2 way 8th order active crossover will have 8 op amps (c64 trasnsistors) in the signal path! Please feel free to examine the circuit diagrams of any active crossovers that you may own to determine how many active amplification devices your active crossover is adding to the signal path.