Reference,Value,Footprint,Manufacturer Part Number,Qty,Notes
U1-U4,OPA2134PA or OPA2134UA,Package_DIP:DIP-8_W7.62mm or Package_SO:SOIC-8_3.9x4.9mm_P1.27mm,OPA2134PA / OPA2134UA,4,Dual FET-input; 2 channels per IC → 4 ICs cover 8 stages (3-way). VERIFY pinout
R_HP300_R1,56k 1% metal film,Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal,Vishay MRS25000C5602FCT00,4,Mid HP stages (2 stages × R1); also use matched sets
R_HP300_R2,112k (110k E24 or 100k+12k),Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal,Vishay MRS25000C1103FCT00 + series,4,Prefer exact 2×R1=112k for Butterworth Q
C_HP300,6.8nF 63V film/C0G,Capacitor_THT:C_Rect_L7.2mm_W2.5mm_P5.00mm,WIMA FKP2-6N8 or Kemet C0G,8,Mid HP C1/C2 (2 stages × 2 caps)
R_LP3k,560 1% metal film,Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal,Vishay MRS25000C5600FCT00,4,Mid LP R1/R2 × 2 stages
C_LP3k_C1,68nF 63V film,Capacitor_THT:C_Rect_L7.2mm_W3.5mm_P5.00mm,WIMA MKS2-68nF,2,Mid LP C1 per stage
C_LP3k_C2,136nF (2x68nF parallel),Capacitor_THT:C_Rect_L7.2mm_W3.5mm_P5.00mm,WIMA MKS2-68nF,4,Exact 2·C1 — parallel preferred over 130nF E24
R_LP300,5.6k 1% metal film,Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal,Vishay MRS25000C5601FCT00,4,Woofer LP R1/R2 × 2 stages
C_LP300_C1,68nF 63V film,Capacitor_THT:C_Rect_L7.2mm_W3.5mm_P5.00mm,WIMA MKS2-68nF,2,Woofer LP C1
C_LP300_C2,136nF (2x68nF),Capacitor_THT:C_Rect_L7.2mm_W3.5mm_P5.00mm,WIMA MKS2-68nF,4,Woofer LP C2
R_HP3k_R1,5.6k 1% metal film,Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal,Vishay MRS25000C5601FCT00,2,Tweeter HP R1 × 2 stages
R_HP3k_R2,11.2k (11k E24 or 10k+1.2k),Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal,Vishay MRS25000C1102FCT00,2,Prefer 2×R1=11.2k
C_HP3k,6.8nF film/C0G,Capacitor_THT:C_Rect_L7.2mm_W2.5mm_P5.00mm,WIMA FKP2-6N8,4,Tweeter HP caps
Cdec_opamp,100nF X7R 50V,Capacitor_SMD:C_0805_2012Metric,Murata GRM21BR71H104KA01L,8,One per supply pin pair at each OPA2134
T1,18-0-18 VAC 15VA+ toroidal,Transformer_THT:Transformer_Toroid_Chassis,Antek AS-0518 or equivalent,1,Center-tapped; VERIFY VA for load. MAINS SAFETY
BR1,Bridge rectifier 1A 100V+,Diode_THT:Diode_Bridge_Round_D9.0mm,Vishay W04G-E4 or KBL005,1,Secondary AC to raw DC
C_rawP,2200uF 35V electrolytic,Capacitor_THT:CP_Radial_D16.0mm_P7.50mm,Panasonic EEU-FR1V222,1,+ raw filter before 7815
C_rawN,2200uF 35V electrolytic,Capacitor_THT:CP_Radial_D16.0mm_P7.50mm,Panasonic EEU-FR1V222,1,- raw filter before 7915
U_regP,LM7815 +15V 1A,Package_TO_SOT_THT:TO-220-3_Vertical,LM7815CT/NOPB,1,Positive regulator — heatsink if needed
U_regN,LM7915 -15V 1A,Package_TO_SOT_THT:TO-220-3_Vertical,LM7915CT/NOPB,1,Negative regulator — VERIFY pinout differs from 7815!
C_outP,100uF 25V + 100nF,Capacitor_THT:CP_Radial_D6.3mm_P2.50mm,Panasonic EEU-FR1E101L + ceramic,1,7815 output reservoir per datasheet
C_outN,100uF 25V + 100nF,Capacitor_THT:CP_Radial_D6.3mm_P2.50mm,Panasonic EEU-FR1E101L + ceramic,1,7915 output reservoir
F1,Fuse T500mA primary,Fuse:Fuseholder_Cylinder-5x20mm,Littelfuse 0218.500MXP + holder,1,Mains primary protection
S1,Mains DPST switch,Button_Switch_THT:SW_CuK_JS202011CQN_DPDT_Straight,Carling or similar,1,Disconnect both live and neutral where required by code
J_in,RCA stereo input,Connector_Audio:RCA_CUI_RCJ-014_Horizontal,CUI RCJ-014,1,Line input to crossover
J_out,3x RCA outs (W/M/T),Connector_Audio:RCA_CUI_RCJ-014_Horizontal,CUI RCJ-014,3,One per channel to power amps