* =============================================================================
* Tweeter channel — Linkwitz-Riley 4th-order high-pass @ 3000 Hz
* Signal chain: HPF(3000 Hz) → HPF(3000 Hz)
* Op-amps: OPA2134 macromodel, ±15 V
* Values from: python calculator.py 300 3000 --channel tweeter
* =============================================================================

.param Chp=6.8n Rhp1=5.6k Rhp2=11.2k

.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
D1 OUT VCC DCLAMP
D2 VEE OUT DCLAMP
.model DCLAMP D(Is=1e-15 N=0.01)
.ends OPA2134X

Vin IN 0 DC 0 AC 1

* Stage 1 — Sallen-Key HPF 3 kHz
* WHY: keeps LF excursion out of fragile tweeter; R2=2·R1 → Q=0.707
C1a IN N1a {Chp}
C2a N1a N2a {Chp}
R1a N2a 0 {Rhp1}
R2a N1a OUT1 {Rhp2}
X1 N2a OUT1 OUT1 VCC VEE OPA2134X

* Stage 2 — identical → LR4 HP
C1b OUT1 N1b {Chp}
C2b N1b N2b {Chp}
R1b N2b 0 {Rhp1}
R2b N1b TWEET_OUT {Rhp2}
X2 N2b TWEET_OUT TWEET_OUT VCC VEE OPA2134X

Rload TWEET_OUT 0 100k

VCC VCC 0 15
VEE VEE 0 -15
CdecP VCC 0 100n
CdecN VEE 0 100n

.ac dec 100 10 20k
.print ac Mag(V(TWEET_OUT)) Phase(V(TWEET_OUT))
.end