CABLE RUN

C.S.A. OF EACH

CABLE

% POWER LOSS

% POWER LOSS

(m)

CONDUCTOR (mm)

RESISTANCE Ω

INTO 8Ω LOAD

INTO 4Ω LOAD

10

2.5

0.14

1.7

3.5

 

4.0

0.09

1.1

2.2

 

6.0

0.06

0.73

1.5

25

2.5

0.35

4.3

8.6

 

4.0

0.22

2.7

5.4

 

6.0

0.14

1.8

3.6

50

2.5

0.69

8.6

17.0

 

4.0

0.43

5.4

11.0

 

6.0

0.29

3.6

7.2

100

2.5

1.38

17.0

35.0

 

4.0

0.86

11.0

22.0

 

6.0

0.58

7.2

14.0

4. Polarity Checking

It is most important to check the polarity of the wiring. A simple method of doing this without a pulse based polarity checker for LF units is as follows: Connect two wires to the +ve and -veterminals of a PP3 battery. Apply the wire which is connected to the +ve terminal of the battery to the speaker cable leg which you believe to be connected to Pin 1+ of the speaker connector and likewise the -veleg of the battery to Pin 1-.

If you have wired it correctly the LF drive unit will move forward, indicating the wiring is correct. All that remains now is to connect the +ve speaker lead to the +ve terminal on the amplifier and the -velead to the -veterminal on the amplifier. If however the LF driver moves backwards, the input connections need to be inverted.

If problems are encountered, inspect the cable wiring in the first instance. It should also be noted that different amplifier manufacturers utilise different pin configurations and polarity conventions. If you are using amplifiers from more than one manufacturer, check the polarity at the amplifiers as well as the loudspeakers.

5. Amplification & Power Handling

As with all professional loudspeaker systems, the power handling is a function of voice coil thermal capacity. Care should be taken to avoid running the amplifier into clip (clipping is the end result of overdriving any amplifier). Damage to the loudspeaker will be sustained if the amplifier is driven into clip for any extended period of time. Headroom of at least 3dB should be allowed. When evaluating an amplifier, it is important to take into account its behaviour under low impedance load conditions. A loudspeaker system is highly reactive and with transient signals it can require more current than the nominal impedance would indicate.

Generally a higher power amplifier running free of distortion will do less damage to the loudspeaker than a lower power amplifier continually clipping. It is also worth remembering that a high powered amplifier running at less than 90% of output power generally sounds a lot better than a lower power amplifier running at 100%. An amplifier with insufficient drive capability will not allow the full performance of the loudspeaker to be realised.

It is important when using different manufacturers amplifiers in a single installation that they have very closely matched gains, the variation should be less than +/- 0.5dB. This precaution is important to the overall system balance when only a single compressor/limiter or active crossover is being used with multiple cabinets; it is therefore recommended that the same amplifiers be used throughout.

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Tannoy B225 user manual 100 17.0 35.0 11.0 22.0 14.0 Polarity Checking, Amplification & Power Handling

B225 specifications

The Tannoy B225 is a professional-grade studio monitor speaker that has earned a reputation for delivering remarkable sound quality and precision in various audio environments, from home studios to larger professional setups. Renowned in the industry for its innovative technology and robust build, the B225 is designed to meet the demanding needs of audiophiles and music producers alike.

One of the standout features of the Tannoy B225 is its dual-concentric driver design. This unique configuration places the high-frequency tweeter at the center of the low-frequency woofer, providing a coherent wavefront that contributes to an accurate soundstage. The result is a more focused audio image, allowing listeners to pinpoint instrument placements and vocal clarity, which is crucial during mixing and mastering sessions.

The B225 also boasts a substantial power handling capability, ensuring that it can handle dynamic audio without distortion. With an RMS power rating of around 150 watts, the B225 delivers impressive volume levels while maintaining sound fidelity. This makes it suitable for various applications, from critical listening to playback in larger studio settings.

In terms of frequency response, the B225 exhibits a wide range, typically spanning from 40 Hz in the lower spectrum to around 25 kHz in the upper range. This allows for rich bass reproduction and clear high-frequency detail, enabling users to hear every nuance in their recordings. Such a broad frequency range is particularly beneficial for genres that demand precise lows and crisp highs, like classical or electronic music.

Another notable characteristic of the Tannoy B225 is its versatility in connectivity. It includes a range of input options, allowing for compatibility with various audio interfaces, mixers, and other equipment. This adaptability makes it a popular choice for studio engineers and producers who require a reliable monitoring solution in diverse settings.

The cabinet design of the B225 is also noteworthy; it features a robust construction that minimizes resonance and vibrations, ensuring cleaner playback. Additionally, the enclosed design aids in achieving a balanced sonic output, making it easier for users to create mix decisions confidently.

In summary, the Tannoy B225 stands out in the crowded market of studio monitors due to its dual-concentric technology, extensive frequency response, substantial power handling, versatile connectivity, and sturdy build. Whether you are a seasoned professional or an aspiring music producer, the Tannoy B225 is a worthy investment for achieving high-fidelity sound reproduction.