* =============================================================================
* CAMS-1 full chain SPICE — LR4 @ 2.5 kHz + dual gain-21 amps (mid + HF pad)
* Mirrors "double mid" cascaded stages: LP×2 for mid, HP×2 for HF
* Values: electronics/xo_values_2500Hz.txt + COMPONENTS_COMPLETE.csv
* =============================================================================

.param Rlp=3k Clp1=15n Clp2=30n
.param Chp=6.8n Rhp1=6.8k Rhp2=13.6k
.param Gain=21 Rpad1=5.6k Rpad2=5.6k

.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: LP1 ---
R1a IN N1a {Rlp}
R2a N1a N2a {Rlp}
C1a N2a 0 {Clp1}
C2a N1a O_LP1 {Clp2}
X1 N2a O_LP1 O_LP1 VCC VEE OPA2134X
* --- MID: LP2 ---
R1b O_LP1 N1b {Rlp}
R2b N1b N2b {Rlp}
C1b N2b 0 {Clp1}
C2b N1b MID_LINE {Clp2}
X2 N2b MID_LINE MID_LINE VCC VEE OPA2134X

* --- HF: HP1 ---
C1c IN N1c {Chp}
C2c N1c N2c {Chp}
R1c N2c 0 {Rhp1}
R2c N1c O_HP1 {Rhp2}
X3 N2c O_HP1 O_HP1 VCC VEE OPA2134X
* --- HF: HP2 ---
C1d O_HP1 N1d {Chp}
C2d N1d N2d {Chp}
R1d N2d 0 {Rhp1}
R2d N1d HF_LINE {Rhp2}
X4 N2d HF_LINE HF_LINE VCC VEE OPA2134X

* --- Amps (ideal gain) + HF pad ---
Emid SPK_MID 0 MID_LINE 0 {Gain}
Rpad1 HF_LINE PAD {Rpad1}
Rpad2 PAD 0 {Rpad2}
Ehf SPK_HF 0 PAD 0 {Gain}
RLm SPK_MID 0 8
RLh SPK_HF 0 8

.ac dec 100 20 20k
.print ac Mag(V(MID_LINE)) Mag(V(HF_LINE)) Mag(V(SPK_MID)) Mag(V(SPK_HF))
* Expect -6 dB at 2.5 kHz on each line out; SPK_MID ~+26 dB midband; SPK_HF ~+20 dB after pad
.end