Loudspeaker spec sheets, crossover design plans, & speaker enclosure plans.
About SEAS
SEAS loudspeaker drivers are designed and manufactured in Norway. In the late 1920s, at the Norwegian Institute of Technology (NTH), the first Norwegian electrodynamic loudspeaker drivers were designed. Since then Norwegian engineers have been leading the technology race in driver design. From its founding in 1950 as a spin-off of the Norwegian radio manufacturers Radionette and Tandberg, SEAS has been dedicated to creating loudspeakers with superior sound reproduction. The company, whose name means Scandinavian Electro Acoustic Systems, has remained in the forefront of European driver manufacturers for more than 60 years. During this time, SEAS has evolved its products line – from a wide selection of standard drivers for radio and TV sets to the highly innovative customer influenced Hi-Fi drivers offered today. SEAS website.
Where to Buy:
Purchase Seas speaker drivers and speaker parts from Madisound: SEAS Design, SEAS Excel, SEAS Exotic, & SEAS Prestige.
H1216 + H1189 2way Passive Crossover Design
SEAS Prestige CA15RLY (H1216) 5.5″ Coated Paper Cone Woofer gives a smooth extended frequency response with a controlled roll off. Blended here with the H1189 fabric dome tweeter with polymer surround. The single small value high pass cap and single low pass choke indicate a nice acoustic match.
Enclosure suggestions:
H1571 + NEOCD3.0M 2way Passive Crossover Design
This design uses the Seas H1571 7″ Curv Cone, same woofer used in the popular Idunn and Bragi kits mated with the Fountek ribbon tweeter. Single high pass cap. No box specified.
Enclosure suggestions:
SB13PFC25-04 and H1396 Passive Crossover Design
Crossover point about 3.2 kHz. Average SPL about 90 dB. Two high pass caps. Cabinet volume unspecified.
MW16P-8 x2 + T25CF002 MTM Crossover Design
Crossover point about 2.2 kHz. World famous Millennium tweeter.
Enclosure: 1.5 cf3 with two straight vents 2″ x 6″ each
Seas H1571 + H1189 2-way Crossover Design
Crossover point about 2.8 kHz. Very simple and clean design with single hi pass cap.
Woofer in 0.7 cf3 with single straight port 2″ x 5″.
ZA14W008 + XT25TG30 2-way Passive Crossover Design
Single hi-pass cap.
Woofer in 0.25 cubic foot vented with a single straight port 1.5″ x 5″
H1216+ H0737 2-way Passive Crossover Design
Very clean and simple 2-way with low parts count.
H1215 + H1189 2-way Passive Crossover Design
Very clean and simple 2way design. 14 and 20 liter vented box options specified.
Note: Tweeter and midrange in reverse polarity to woofer.
Small high pass cap, but large value midrange cap. High-order network.
Woofer in 3.0 cf3 tuned with a 3″ x 5″ straight port. Midrange in 0.2 cf3 sealed.
H1208 + H1262 + H1189 3-way Passive Crossover Design
Note: Tweeter and midrange in reverse polarity to woofer.
Small high pass cap, but large value midrange cap. High-order network.
Woofer in 1.0 cf3 tuned with a 2″ x 4″ straight port. Midrange in 0.1 cf3 sealed.
Simulated in half-space. Crossover points at 300 Hz and about 3.3 kHz.
Note low impedance dropping to 3 ohm in lower region.
Large midrange cap and two large hi-pass caps. Woofer in 1.8 cf3 with single vent 3″ x 10″. Note mid and tweeter are in reverse polarity relative to woofer.
SB29RNX75+ H1571 + H1212 3way Passive Crossover Design
SB29RNX75+ H1571 + H1212 3way Passive Crossover Design
Notes: 3way Passive Design with 10″ SB woofer. Crossover points at ~300 Hz and ~2.6kHz. Clean network with one series high-pass and one mid-pass cap.
Woofer alignment: 2.1 cubic foot vented, single vent 3″ x 6″
Midrange: 0.25 cf sealed
W18E-001 + R2904-7000 Passive Crossover Design
Seas Excel W18E-001 + Scan Speak R2904-7000 2way Passive Crossover Design
No box alignment specified. Very clean 2-way with low parts count, single hi-pass cap and minimal tweeter padding.
W18EX-001 + T25CF-0001 Passive Crossover Design
W18EX-001 + T25CF-0001 Passive Crossover Design
Box alignment: 0.25 cubic foot ported with single straight vent 2″ x 6″
Notes: Single hi-pass cap. Some extra padding on tweeter.
W18EX-001 + T25CF-002 Passive Crossover Design
W18EX-001 + T25CF-002 Passive Crossover Design
Box alignment: 0.48 cubic foot vented with single straight port 2″ x 6″
Single hi-pass cap. Some extra padding in tweeter circuit.
W18EX-002 + T25CF-002 Passive Crossover Design
Seas W18EX-002 + T25CF-002 Passive Crossover Design
No box alignment specified. Single high-pass cap with some extra padding in tweeter circuit.
W20RC38-08 + H1189 2way Passive Crossover Design
Silver Flute 8″ W20RC38-08 + Seas Prestige H1189 2way Passive Crossover Design
No specified box alignment.
Notes: Crossover point about 2.2 kHz. Output in the 86-88 dB range. Pretty clean design. One hi-pass cap. Fair amount of tweeter padding.
W22EX-001 + 12MU-4731T + D2905-9700 3way Passive Crossover Design
Seas Excel W22EX-001 + Scan-Speak 12MU-4731T + Scan-Speak D2905-9700 3way Passive Crossover Design
Anechoic design (flat response)
Woofer: 1.8 cubic foot vented with single port 3″ x 4″
Midrange: 0.25 cubic foot sealed
Notes: Crossover points @ about 350 Hz and 3.2 kHz. Two high pass and one midrange cap. Woofer in reverse polarity relative to midrange and tweeter.
W22EX-001 + D2905-9900 2way Passive Crossover Design
Seas Excel W22EX-001 + Scan-Speak Revelator D2905-9900 2way Passive Crossover Design
Box alignment: 1.5 cubic foot vented with DUAL (two) ports 2.5″ diameter x 6″ length
Notes: Crossover point about 1.8 kHz. Output in the 86-88 dB range. Two large hi-pass caps and fair amount of tweeter padding.
W22EX-001 + H1189 2way Passive Crossover Design
Seas Excel W22EX-001 + Seas Prestige H1189 2way Passive Crossover Design
Box alignment: 1.7 cubic foot vented with single port 3″ x 6″
Notes: Crossover point about 2 kHz. Output in the 86-88 dB range. Pretty clean design. One hi-pass cap. Fair amount of tweeter padding.
W22EX-001 + H1262 + T25CF-002 3way Passive Crossover Design
Seas Excel W22EX-001 + Seas Prestige H1262 + Seas Millennium T25CF-002 3way Passive Crossover Design
Woofer: 1.7 cubic foot vented with single 3″ port x 6″ length
Midrange: .15 cubic foot sealed
Notes: Crossover point about 360 Hz and 3.9 kHz. Output in the 82-83 dB range. High parts count with multiple caps. Woofer in reverse polarity relative to mid and tweeter.
W22NY001 + D2608-9130 HDS 2way Passive Crossover Design
Seas Nextel W22NY001 + Scan Speak D2608-9130 HDS 2way Passive Crossover Design
No specified box alignment.
W22NY001 +D2905-9900 2way Passive Crossover Design
Seas Nextel W22NY001 +Scan-Speak Revelator D2905-9900 2way Passive Crossover Design
Box alignment: 1.0 cubic foot ported with single 2″ vent x 3″ length.
W22NY-001 + H1499 2way Passive Crossover Design
Seas Nextel W22NY-001 and Seas H1499 2way Passive Crossover Design
Box alignment: 1.5 cubic foot vented with single 3″ port x 5.75″ length.
Notes: Crossover point just under 2 kHz. Some complexity to network with two high-pass caps.
W22NY-001 + R3004-6020-00 2way Passive Crossover Design
Seas Nextel W22NY-001 and Scan-Speak Illuminator ring dome, small chamber R3004-6020-00 2way Passive Crossover Design
No specified box alignment.
W26FX-002 + SCM634 + ST1108 3way Passive Crossover Design
W26FX-002 + SCM634 + ST1108 3way Passive Crossover Design, flat anechoic (no tweeter modulation)
Woofer: 2.5 cubic foot vented with dual (two) 3″ vents x 6″ length
Midrange: 0.15 cubic foot sealed
MW16P-8 + T29CF-002 2way Passive Crossover Design
Satori MW16P-8 + Seas Crescendo T29CF-002 2way Passive Crossover Design
Woofer: 0.75 cubic foot vented with single straight port 2″ x 6″, OR 0.5 cubic foot sealed box.
SB23NRXS45 + H1304 + H1189 3way Passive Crossover Design
SB23NRXS45-8 + H1304 + H1189 3way Passive Crossover Design
Woofer: 2.0 cu ft. vented, single straight port 3″ diameter x 4″ length
Midrange: 0.15 cubic foot sealed
Note: Woofer in reverse polarity to midrange and tweeter. Very large midrange cap.
W14RC25 + TN25 Passive Crossover Design
2way with Silver Flute 5″ woofer and HiVi TN25 tweeter
No box alignment designated.
W18E-001 + R2904-7000 Passive Crossover Design
W18E-001 + R2904-7000 2-way Passive Crossover Design
No box alignment designated.