At first glance, I know that these speakers were removed from the stereo in the 1980 s and are the lowest-grade things. A good horse needs a saddle, and a bad horse needs a quilt.
Scheme: If there is the original box size, the original box size will be adopted; If not, the box should be fully enclosed, and the inverted box with air holes cannot be built, which needs accurate calculation. According to the previous 6.5 "speaker, the volume of the box is estimated to be 15-25 liters, and the tolerance of the closed box is very large. It is suggested that it be a little louder, say, 25 liters, then listen, and then throw some bricks into the box, so as to reduce the volume and adjust it to your satisfactory bass. Plate thickness, with multi-layer board or medium density board (fracture is very dense, no air gap, there is air gap is density board)
Wiring, if all speakers are used, you can use the original frequency divider. A channel divider has three outputs, one with the letter "L" or "BASS" connected to a 20w speaker, the other with the word "MID" or "M" connected to a 10cm speaker, and the rest connected to a 5cm speaker.
It can be simpler. Throw away the speaker of 10cm, connect the speaker of 16cm directly to the box, and connect the speaker of 5cm with a capacitor of 3uF-5uF. You can remove the capacitor from the frequency divider. The minimum capacitance should not be less than 2uF, and the maximum capacitance should not be greater than 10uF. Capacitance is directly marked on components, generally 1.5uf, 2.2uf, 2.7uf, 3.3uf, 4.7uf, 6.8uf, 8.2uf, 10uf, and there will be no integer. This is done because the original treble can actually play back a lower frequency, so the midrange is also optional. The stereo engages in three ways to cheat more money.
Power amplifier, if you don't want to start work, go to Taobao to find some power amplifiers, both DIY and second-hand; If you want to start work, you can buy a finished amplifier board and connect the transformer, input cable and speaker cable. You can go to the local electronic market distribution center or search on Taobao. A power amplifier with a power of 30-50w is suitable. The horn burns easily when it is big, but it can't be pushed when it is small. TDA7294/LM3875/3876/3886 is very cost-effective. TDA2030*2 single BTL amplifier is ok, but don't buy LM 1875. Nine and a half dollars of this thing 10 is a fake, which was polished by TDA2030.
Considering that transformers can be played more, it is best to customize a voltage tap as much as possible. Many transformers sold in the market have two or three groups of windings, but only one group, that is, the one with the highest voltage, is large current, and the others are small current and inflexible. If there is a local electronics company that can customize the transformer, customize it. Take multiple taps in the high current winding, such as TDA2030 needs 12V*2, LM 1875/LM675 needs 18V*2, 3886/7294 needs 25V-28V*2, so there are many ways to play with multiple taps.
If you can't customize it, you can only buy it now, and you can only apply for one IC. The power of TDA2030 is not less than 30w, that of TDA2030 is more than 60w, and that of LM38XX and TDA7294 is not less than 200w. In fact, the bigger the transformer, the higher the cost performance, just like hard disks and memory chips.