In the diversified user practice, it is very important to choose the sound column in order to reduce the cost and improve the performance of the speaker.
       Although the OBT-122, OBT-124, OBT-126, and OBT-128 series sound columns are designed with aluminum alloy, they are mainly used indoors. The design is relatively slim, and the 4-inch speaker is not suitable for outdoor use. Adopt OBT-901, OBT-902, OBT-903, OBT-904 series;
       If you are pursuing a relatively high frequency, it is recommended to use OBT-121, OBT-123, OBT-125, OBT-127 series;
       If the outdoor space is relatively large and requires more than 100 watts of high-power sound column, it is recommended to use OBT-710, OBT-720, OBT-730, OBT-740, OBT-750, OBT-760, of which OBT-760 is at 100V output voltage. When the power can reach 180W;
       If the transmission direction of the audio source is required to be 360 degrees, it is best to use the OBT-131, OBT-133, OBT-135, and OBT-137 series two-way broadcast type sound columns.
       If you require a relatively large sound pressure indoors, you can use the above models, you can also use the all-wood OBT-162, OBT-166, OBT-168 series, cost-effective.