Technical parameters: 1. Rated impedance. Common rated impedances of speakers are 4, 6, 8 and 16. At present, speakers are all driven by transistors or integrated circuit power amplifiers, and generally do not use output transformers. Therefore, the impedance of the connection speaker is mostly in the range of 4- 16 ohms, and the impedance of the speaker should be selected according to the requirements of the power amplifier. Second, the effective frequency range. The wider the sound pressure frequency range, the better the frequency characteristics. The effective frequency range of speakers is strictly stipulated in the standards of the International Electrotechnical Commission. Now some manufacturers have marked the frequency response range of speakers, but they have not marked the effective range. For example, one pair of speakers is marked with a frequency response range of 20Hz-20kHz, and the other pair of speakers is marked with a frequency response range of 30 Hz-17 kHz. Compared with the latter, the frequency response of the latter pair of speakers seems to be not as wide as the former, but in fact, the frequency response curve of the latter pair of speakers shows that it only changes within 3dB, so the latter is better than the former. Third, the frequency divider. Generally speaking, the performance of tri-band speakers should be better than that of dual-band speakers. Because the three-frequency division adds an intermediate frequency speaker unit, the intermediate frequency can be more rounded. But also reduces the power shared by the three speakers, so that the whole speaker can bear more power and output more volume. Of course, the three-way speaker has a midrange unit and a frequency divider, which is more expensive than the two-way speaker of the same grade. Fourth, sensitivity. Generally speaking, 90dB sensitivity speakers are enough to meet the needs of home audio. Five, the diameter of the speaker. The diameter of the woofer is generally 20-38cm, and there are also super-large diameters of 60cm or 72cm; The diameter of tweeters is generally 2-6cm, and some are more than 9cm. For woofers, the larger the aperture, the better. Because the larger the caliber, the easier it is for the paper basin to deform when it vibrates, resulting in divided vibration, thus causing distortion. Six, the speaker net weight. Generally speaking, the heavier the speaker, the better the quality. Because the heavier the speaker, the larger the magnetic steel or the thicker the plate used for the speaker, both of which will make the sound quality better. Rambler Mai Bo hivi Audio is a very good brand LZ. Do you want to buy more than 2000 speakers? If yes, I recommend hivi T200B Music Monitor Master 2550 Logitech Z 5500 2888 Rambler S 2000 2000 Mai Bo Van Gogh 760 2800.