Connecting acoustics to modern radio tape recorders. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Connecting acoustics to modern radio tape recorders. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Speakers

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Radios with four-channel bridge amplifiers

For four-channel bridge amplifiers, which are equipped with almost all modern radio tape recorders, the above options for switching on speakers can be combined in various ways. For example, using "mixed mono" and the usual connection scheme at the same time (Fig. 5), you can connect a subwoofer and "tweeters" or rear speakers (with bandwidth limitation), and use the remaining channels for midbass or front speakers.

Rice. 5 (click to enlarge)

Another option is a three-way front speaker with a combined connection and Huffler sub-sound. The fader allows you to adjust the ratio of MF and LF, the HF level in the process of regulation changes within 6 dB. The load connection order is chosen so that amplifier overload does not occur even when using low-frequency heads in the full frequency band, and midrange - only with a high-pass filter, which makes this circuit especially attractive - no need to wind inductors.

Rice. 6 (click to enlarge)

Recommendations

Since the inverting and non-inverting outputs of the built-in amplifier are used, pay attention to the polarity of connecting the heads. In cases where, according to the scheme, it is required to connect one of the load terminals to the "ground", this must be done on the radio housing or on the "negative" power wire as close as possible to its housing. Connection to the "mass" of the car is not allowed!

For circuits with a bridge option for connecting the load, it is necessary to use non-polar oxide (electrolytic) capacitors as part of the filters. In the extreme case, they can be made up of two polar capacitors with twice the capacity, connecting them back-to-back ("plus" to "plus"), but the sound quality with non-polar capacitors is higher. Capacitors of small capacity are better to use paper or polypropylene.

Calculation of the low-pass filter for a subwoofer is performed in the usual way. However, it is desirable to introduce a 1 ohm resistor into the design of the second order filter, as shown in the diagrams. This will reduce the chance of overloading the radio amplifier.

The crossover frequency and LPF order for the subwoofer are selected within the range of 80...200 Hz, depending on the location of the low-frequency head. If it is located in the rear of the passenger compartment, the crossover frequency should be chosen as low as possible, and the order as high as possible, to avoid the subwoofer reproducing the "voice" range. However, this requires the manufacture of truly cyclopean inductors. On the one hand, it is undesirable to use ferromagnetic cores in their design, since the distortions caused by the inevitable magnetization of the core significantly degrade the sound quality. On the other hand, the use of a core makes it possible to drastically reduce the active resistance of the coil and the losses in it, which is especially important when using the built-in amplifiers of the radio. So the choice must be made on a case-by-case basis. In a word, there are many options - it would be a fantasy.

Author: A. Shikhatov; Publication: bluesmobile.com/shikhman

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