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Rectangular aluminium box with seven slider controls and 3.5mm jacks

Bolton Technical

Bolton Technical 7 Band Sound Equalizer 2 in 1 accessory

SKU CH-M7XV-H2D6E

Seven-band equaliser with 12 dB range, 3.5 mm four-pole input, headphone amplifier and dual-channel aluminium chassis

  • 7-band EQ with 12 dB control per band for precise tone shaping
  • 4580 op-amp delivers 14 dB pre-amp gain with 20 K input and 600 ohm output
  • NE5532 headphone driver handles 47 ohm loads for clear private listening
  • 5 mm 4-pole input plus lotus output supports headset mic calls
  • Aluminium alloy chassis runs on DC 5 V–12 V dual-channel power

7-Band Equalizer for Mobile Audio

This dual-channel equalizer provides seven adjustable frequency bands spanning 60 Hz to 15 kHz with a 12 dB control range. It targets users who want precise tone shaping for headphones or in-car systems powered from a 5 V to 12 V DC source.

TL074 and NE5532 Op-Amp Circuitry

The signal path uses a TL074 for equalisation and a 4580 op-amp delivering 14 dB pre-amplification gain, while a NE5532-based headphone driver stage handles loads down to 47 ohms. A 3.5 mm four-pole jack carries microphone audio for phone calls, and a secondary RCA-style lotus connector offers an alternative output path.

Simple Wiring with Impedance Awareness

Installation requires only a DC supply between 5 V and 12 V plus audio connections; input impedance is 20 kΩ and output impedance 600 Ω. Mismatched source impedance or an unstable power rail can introduce noise, so verify wiring polarity and supply regulation before final mounting.

Highlights

  • 7-band EQ with 12 dB control per band for precise tone shaping
  • 4580 op-amp delivers 14 dB pre-amp gain with 20 K input and 600 ohm output
  • NE5532 headphone driver handles 47 ohm loads for clear private listening
  • 5 mm 4-pole input plus lotus output supports headset mic calls
  • Aluminium alloy chassis runs on DC 5 V–12 V dual-channel power

Specifications

No published specifications for this item yet.

Questions about this item

Will the 4580 or TL074 op-amps need periodic replacement?

The 4580 and TL074 op-amps are soldered components rated for long service life; no user-replaceable schedule is specified.

What limits continuous operation first — the 600-ohm output stage or the DC 5 V–12 V supply?

The 600-ohm output impedance and 14 dB preamp gain set the signal headroom; sustained clipping occurs before the supply rails are stressed.

Does the aluminum-alloy chassis stay cool when the NE5532 headphone driver runs all day?

The aluminum alloy body dissipates heat from the NE5532 driver and dual-channel circuitry, keeping surface temperature low during extended use.

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