Mixed connection of acoustics to a two-channel amplifier and a fader at the output. Scheme, description

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Mixed connection of acoustics to a two-channel amplifier and a fader at the output. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Speakers

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There are still quite a few such "dinosaurs" produced in the mid-90s in operation. A characteristic feature of the built-in amplifiers of such devices is that they are designed for a load of 2 ohms and have a solid power reserve. This is due to the fact that in the middle position of the fader, the front and rear speakers are connected in parallel. However, it is impossible to use component acoustics together with them. The reason is simple - when you introduce a fader, the output impedance of the amplifier increases, which leads to a change in the cutoff frequency of the crossovers. Therefore, the only possible use of the amplifiers of such devices with modern acoustics is a two-channel configuration, in which the fader is excluded from operation.

In this option, you can add a subwoofer by turning it on according to the "mixed mono" scheme. Since it is impossible to adjust the ratio of the levels of the front speaker and the subwoofer, one of the connection options is selected depending on the sensitivity of the used heads (Fig. 1).

Rice. 1 (click to enlarge)

Option А used when the sensitivity of the front speakers is 3-5 dB higher than that of the subwoofer. In this version, they are connected to the amplifiers not via a bridge, but according to the usual scheme, and the power supplied to them does not exceed 7 W / 4 Ohm. To obtain sufficient volume of front acoustics, it is desirable to use high-performance heads with a sensitivity of about 91-93 dB. Pay attention to their phasing - one of the "semiamplifiers" is inverting, the second is non-inverting. The cutoff frequency of the HPF formed by capacitors C1 and C2 can be chosen arbitrarily, however, the presence of capacitors is fundamentally important - they do not pass the constant component from the output of the amplifiers to the speakers. Front heads are conventionally shown as wideband, but they can be coaxial or component.

Option Б used when the sensitivity of all heads is close. The presence of capacitors C1,C2 is no longer necessary for normal operation, since a bridge connection is used. In the absence of capacitors, the heads in the passband of the subwoofer filter operate in parallel. This reduces the load impedance to 2 ohms, but the amplifier is designed for this. For the subwoofer, a second order filter (C3L1R1) is used in both cases.

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

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