Rolls PA 71 Plus

MicroMix Preamplifier

  • Power: 7 W
  • XLR microphone and RCA line inputs with single gain control
  • Phantom power: 12V
  • Jack outputs
  • Binding post outputs
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features
handling
sound
quality

Phantom j nnitesy tt l hinn joke

12.05.2015
Taking care of a small amplifier. It was positive that the document is an internal circuit diagram of the unit involved. It helped the biggest problems in deciphering this amplifier. When the microphone required phantom power switches on, began a terrible hissing that concealed everything from a microphone. The reason is that the wiring diagram of the phantom voltage through resistors will direct the + V voltage, which has no stabilization nor more than 2200 uF filtering capacitor. mounted on top of the supply voltage mains, therefore, came directly from the microphone line! Astonishing design, in a negative sense.
When the phantom power to the microphone for some well-filtered voltage, hissing stops.

A slight hum went still, but it slowed down quite a bit, when you took the hand on the metal housing of the device. Tarvii to pull a separate ground connection on the housing. The power supply is an ordinary wall socket pushed unearthed.

Phantom try to settle the problem I opened the device and the innards can be comfortably accessed. Little flaw: one housing screw was missing already on the side of the housing.

Not me no hi-end device, but one kuulutusvahvistimena fair, if you use a dynamic microphone, or do not need phantom power.

Good idea behalf of interfaces, can mix line and microphone inputs. Separate outputs for headphones and speakers.

I would consider a bit price / performance ratio bad.
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Offers include 20% British VAT and are valid as long as stocks last. Shipping costs to the U.K. are 10 EUR (approx. £7), free shipping on orders above 149 EUR. Please click here for international Shipping Costs and Delivery Times. We do not accept liability for typographical errors or inaccurate information of any kind. *RRP = manufacturer's / distributor's recommended retail price in Germany
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