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Passive HiFi Stereo Preamp Audio Booster Volume Controller for Power Amplifier

Item description

Warm tips:
 
Default 10K:10K impedance version, if you want other impedance ratio version please leave a message.
Features
  • Passive preamp, suitable for the audio signal input such as mobile phone, computer, CD/MP3/MP4 player, LP and other media streaming players so on, and match power amplifiers, active speakers and some monitor audio devices very well with lossless sound quality.
  • Inspired by winding process of classic audio transformer, and we have made much improvement after precision calculation and testing, adopting 10K:10K permalloy transformer, the signal is boosted by 2 times, even can replace the active preamp. The measured frequency response of transformer is 10Hz-100KHz(-0.2DB) and 20Hz-50KHz(0.1DB).
  • High-quality components are used to ensure perfect performance and long time stable work:

Permalloy transformer made of E25 sheet with ultra-high inductance, ultra-low leakage inductance and small distributed capacitance. Primary and secondary inductances are around 1100H to 1600H.

Japan APLS 27-type duplex potentiometer(with smaller error, higher precision, lower noise, longer service life, and more smooth rotating feelings) to control the volume.

US CMC816 gold-plated pure copper RCA terminals for lossless transmision, solid aluminum alloy knob and so on.

  • Mini size with exquisite appearance, cast aluminium chassis and aluminum alloy knob looks very textured and high-end.
Notice:
 
The voltage is magnified 2 times, but the volume is not 2 times larger, the volume and voltage are logarithmic relations.
 
The passive preamp should not be too close to the power amplifier and power transformer to prevent the magnetic field and electric field from interfering with Permalloy and generating hum noise.
Parameters
  • Audio input: stereo L/R RCA
  • Audio output: stereo L/R RCA
  • Dimensions (W*H*D): 164*94*35mm / 6.45*3.70*1.37in
  • Net weight: 650g / 1.43lb
  • Package weight: 850g / 1.87lb
Packing List
  • 1× Passive Preamp
Safe and secure payment by PayPal.
Please leave VALID TELEPHONE NUMBER which is necessary and very important.
 
Customs Clearance
We are NOT responsible for any customs duties fee.
We are NOT responsible for any import tax or customs delay.
 
Most item will be shipped within 2 working days. For package less than 2KG, we use Airmail (10-25 days to most countries) and for package over than 2KG we use Expedited Service such as DHL, UPS and FEDEX (5-8 days to most countries). 

Free Return Within 30 Days

We provide  return within 30 days for all items you bought on eBay, full refund and return shipping will be provided.

1-year warranty is provided for all items(Excluding: 1. Man-made damage or misuse. 2. Audio accessories and consumables such as vacuum tubes).

If you are satisfied with our products and service please leave a 5-star StarStarStarStarStar. Positive feedback rating Feedback is very important to us just like our lives, please DO contact us before you leave a neutral Neutral feedback rating or negative Negative feedback rating feedback, we will provide better solutions until you are satisfied.

 

 

 

Douk Audio / Nobsound Studio was founded in 2013 in Shenzhen CHINA, we own several brands including Douk Audio / Nobsound / Little Bear etc.
 
As a professional audio company, we are dedicated to design and produce the best products at the lowest prices to make HiFi affordable.
 
We will spare no efforts to bring great products and service for customers and extremely to improve our customers’ listening experience.
Please don't hesitate to contact us if you have any questions or comments about our items. And our working time is from Monday to Friday between 9:00 am to 06:00 pm(Beijing Time), which means we can keep on-line at:
 
 Working time

Beijing(CN)Monday-Friday09:00 AM - 18:00 AM
New York(US)
Sunday to Thursday08:00 PM - 05:00 AM
London(UK)Monday-Friday01:00 AM - 10:00 AM
Paris(FR)Monday-Friday02:00 AM - 11:00 AM
 
During holiday, please allow us to response you early next week. Please don't leave any negative / neutral feedback or make dispute/claim on our non-working time, thank you for your understanding and cooperation.
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