I am selling my Beyma SCK-50 Component speakers for a BMW. They are 5 1/4's. Speakers are in great shape and only used for 7 months with a JL Audio 400/4 amp. I have front and rear sets. Should fit any 5 series and 3 series. I paid $250 for each pair. I am selling both pairs for $300. I had them in my last 530i and they were so crispy and clear. Better than my last pair of JL audio components and my MB Quarts. If you want to upgrade your sound system and have that high end sound without the drama, these are the way to go. Each pair comes with cross over and 2 tweeters.





Nominal diameter
Nominal impedance
Power handling / maximum
Sensitivity
Frequency range
Resonant frequency, fs
D.C. voice coil resistance, Re
Mechanical quality factor, Qms
Electrical quality factor, Qes
Total quality factor, Qts
Equivalent air volume to Cms, Vas
Efficiency, ho (%)
Effective surface area, Sd
Xmax
130 mm. 5.25 in.
4 ohms
70 W RMS / 140 W
90 dB 1w @ 1m
60 - 9000 Hz
70 Hz
3.3 ohms.
3.4
1.4
1
5.5 l
0.2
85 cm2