The coaxial output interface of optical drive generally adopts RCA interface, which can be directly connected to the audio input of audio equipment or TV set. Therefore, in most cases, there is no need to add a shaping circuit.

However, in some cases, it may be necessary to add a simple low-pass filter to filter out high-frequency noise. Doing so can ensure the quality of the audio signal is better. However, whether it is necessary to add shaping circuits depends on the specific application and equipment requirements.

If the equipment you use requires high audio quality, or you need to connect the output signal of the CD-ROM drive to the equipment that needs signal shaping, you may need to consider adding a shaping circuit. Generally speaking, this situation is rare.

Generally speaking, when the coaxial output of an optical drive is connected to an audio input device, there is no need to add a shaping circuit. Again, it depends on the specific equipment and requirements.