* Single-mid signal chain (simplified): LR4 mid bandpass + non-inverting gain 21
* For full accuracy use active-crossover/spice/midrange_lr4_bandpass.cir
*   and lm3886-poweramp/spice/lm3886_poweramp.cir separately.
* This file checks cascade magnitude: bandpass then x21 into 8 ohm.

.param Chp=6.8n Rhp1=56k Rhp2=112k
.param Clp1=68n Clp2=136n Rlp=560
.param Gain=21

.subckt OPA2134X INP INM OUT VCC VEE
Gerr 0 NERR INP INM 0.01
Rp NERR 0 10Meg
Cp NERR 0 1.989e-12
Ebuf NBUF 0 NERR 0 1
Rout NBUF OUT 50
.ends

Vin IN 0 DC 0 AC 1
VCC VCC 0 15
VEE VEE 0 -15

* Mid LR4 BP (2x HP 300 + 2x LP 3000) — abbreviated identical stages
C1a IN N1a {Chp}
C2a N1a N2a {Chp}
R1a N2a 0 {Rhp1}
R2a N1a O1 {Rhp2}
X1 N2a O1 O1 VCC VEE OPA2134X
C1b O1 N1b {Chp}
C2b N1b N2b {Chp}
R1b N2b 0 {Rhp1}
R2b N1b O2 {Rhp2}
X2 N2b O2 O2 VCC VEE OPA2134X
R1c O2 N1c {Rlp}
R2c N1c N2c {Rlp}
C1c N2c 0 {Clp1}
C2c N1c O3 {Clp2}
X3 N2c O3 O3 VCC VEE OPA2134X
R1d O3 N1d {Rlp}
R2d N1d N2d {Rlp}
C1d N2d 0 {Clp1}
C2d N1d MID_LINE {Clp2}
X4 N2d MID_LINE MID_LINE VCC VEE OPA2134X

* Ideal power amp gain block (replace with LM3886 model for THD)
Eamp SPK 0 MID_LINE 0 {Gain}
Rload SPK 0 8

.ac dec 100 10 20k
.print ac Mag(V(MID_LINE)) Mag(V(SPK))
* Expect MID_LINE ~0 dB in-band; SPK ~+26 dB in-band; -6 dB at 300 & 3000 Hz on MID_LINE
.end