I designed a simple friction fit clamp to serve the purpose of holding two pair of Ed’s Horns together and to bolt the Heil AMT-1 tweeter.

Heil has arrived

Crossover Build

Pair Backloaded Horns + Single AMT-1
AMT-1 Re=3.4Ohm
FE126 Re=7.2
Parallel FE126 = 3.6Ohm

ESS claims to use a 800hz, 3rd order crossover. Let’s investigate what capcitor and inductors we can actually get, and calculate where the x-over point ends up using parts I can find.

Lets pick out some components….

• L1 = Jantzen .5mH 18AWG $7.98
• L2 = Jantzen 1.1mH 18AWG $11.48
• L3 = Jantzen 0.37mH 18AWG $7.29
• C1 = 40uF 250v $11.98
• C2 = 2x60uF 250V $20.48
• C3 = 75uF 250V $22.98

Let’s proceed to set this up though, let’s model these values in software and see where the x-over point is…

Looks like it hits 806hz at these components, good enough for me.

Update:11-19-19 The Heil has arrived. After some deliberation, constructing a dedicated passive crossover for this setup is inflexible, and given the consideration that I am unlikely to stick with ‘The Horns’ for much longer, I am better served moving to a solution that I can re-use in the next speaker I use. Active digital crossover inbound, and another amplifier.