SKU: 71746605640

Universal Purifi Input Buffer

Sale price$179.10 Regular price$199.00
Save 10%

Pay in installments of $49.75 with ShopPay, AfterPay and Klarna

Shipping Estimate
USA
  • USA
  • CAN

Ships within 48 hours · Estimated delivery Jul 28 - Aug 2

Promo Codes Available:

For Your Every Summer RSVP, with Code: SUMMER15

Description

Universal Purifi Input BufferThis input buffer is designed for the following Purifi and Hypex Class D amplifier modules: 1ET400A, 1ET6525SA, 1ET7040SA, 1ET9040BA, and NC500. Key advantages: Fully differential output for full power, even with a single ended source. Controlled common mode voltage to prevent power supply bus pumping. Four independent ultra low noise voltage regulators for analog and digital power. Get the best performance from your Purifi and Hypex modules with this

This input buffer is designed for the following Purifi and Hypex Class D amplifier modules: 1ET400A, 1ET6525SA, 1ET7040SA, 1ET9040BA, and NC500.

Key advantages:

  • Fully differential output for full power, even with a single-ended source.
  • Controlled common-mode voltage to prevent power supply bus pumping.
  • Four independent ultra low-noise voltage regulators for analog and digital power.

Get the best performance from your Purifi and Hypex modules with this input buffer.

Technical Documentation

  • Description
  • Specifications
  • Circuit Topology
  • The buffer is a single-channel (mono) buffer, with the following features:

    • Differential (balanced, XLR) input, which can easily be configured for single-ended (unbalanced, RCA) operation.
    • Fully differential output even when used with a single-ended source. 
    • Common-mode feedback ensures zero common-mode output voltage to avoid power supply bus pumping.
    • Jumper-selectable gain: 11.6 dB, 13.0 dB, and 13.2 dB for a total amplifier gain of 26.0 dB when used with the Purifi Class D modules. 
    • Gain can be further customized by adding a resistor (1206 size SMD and leaded/PTH supported) or set to unity gain (0 dB).
    • Plug-and-play connection with Hypex SMPS1200 power supply.
    • Four ultra low-noise voltage regulators power the analog and digital circuits of the Buffer and the amplifier module. Optionally, you can add the Hypex HPR/HNR regulators.
    • Speaker output is provided on 6.3 × 0.81 mm quick-connect spades and a terminal block accepting up to AWG 10 (5.2 mm2) in size.

    In addition, the following options are provided for advanced users:

    • By adding a resistor and a 7-pin connector, the amplifier module can be operated in software mode. See the relevant amplifier module data sheet for details. 
    • The buffer can be disabled by removing two resistors. A 3-pin connector footprint provides direct access to the input of the amplifier module.

    The Universal Purifi Input Buffer circuit board is fully assembled, RoHS compliant, and is designed and manufactured in Canada.

  • The full specifications for the Universal Purifi Input Buffer are tabulated below.

    Parameter Value Notes
    Quiescent Power Supply Current
    20 mA
    27 mA
    Nominal
    Maximum
    Maximum Power Supply Current
    47 mA Zload = 1.5 kΩ, +25 dBu
    THD -140 dBc
    (0.00001 %)
    1 kHz, Vin = 2.0 V RMS
    THD -130 dBc
    (0.00003 %)
    20 kHz, Vin = 2.0 V RMS
    THD+N < -120 dB
    (< 0.0001 %)
    1 kHz, Vin = 2.0 V RMS
    THD+N < -120 dB
    (< 0.0001 %)
    1 kHz, Vout = 9.6 V RMS
    IMD: SMPTE 60 Hz + 7 kHz @ 4:1 -112 dB
    Vin = 2.0 V RMS
    IMD: DFD 18 kHz + 19 kHz @ 1:1 -122 dB
    Vin = 2.0 V RMS
    Multi-Tone IMD Residual < -148 dB Ref.: 7.6 V RMS AP 32-tone, Vin = 2.0 V RMS
    Gain 0 dB (1.00×)
    11.6 dB (3.80×)
    13.0 dB (4.47×)
    13.2 dB (4.57×)
    Can be further customized by resistor option.
    Gain Flatness ±0.007 dB 20 Hz - 20 kHz
    Bandwidth DC – 900 kHz 100 mV RMS, -3 dB
    Slew Rate ±21 V/µs Fully symmetric 
    Common-Mode Rejection Ratio (CMRR)

    ≥ 80 dB

    20 Hz - 20 kHz, typical

    Total Integrated Noise and Residual Mains Hum

    2.5 µV RMS (11.6 dB)

    1.5 µV RMS (0 dB)

    20 Hz - 20 kHz, A-weighted
    Total Integrated Noise and Residual Mains Hum

    3.1 µV RMS (11.6 dB)

    1.9 µV RMS (0 dB)

    20 Hz - 20 kHz, Unweighted
    Dynamic Range (AES17) 132 dB Vin = 8 V RMS
    Input Impedance 48 kΩ
    Module dimensions and weight

    64 × 84 × 28 mm

    45 g

    (W × D × H)

     

    All parameters are measured at an auxiliary power supply voltage of ±20 V, 1.5 kΩ differential load impedance, differential input, and 11.6 dB gain unless otherwise noted.

    The specifications were measured on the prototype and should be considered the typical performonce the Universal Purifi Input Buffer. The specifications should not be considered a guarantee and may be changed at any time without notice.

    Sound Quality

    I designed the Universal Purifi Input Buffer to be sonically transparent and firmly believe I have achieved that goal. I generally prefer precise amplifiers as they render the source material naturally, without any colouration, and offer a spacious and realistic sound stage. This aligns well with the design philosophy of Purifi and Hypex as well.

  • A simplified block diagram of the Universal Purifi Input Buffer is shown below.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 71746605640

Discover Niche Categories That Outsell

Top-Converting Item to Boost Your Average Order

4.4 ★★★★★
Based on 27 reviews
Sort
Highest Rating
Newest First
Oldest First
Product Reviews
C
Verified Purchase
Christopher Wilson
Boise, US
★★★★★ 4
Very nice suit for wedding or other event.
Size: Large, Color: Navy Blue, Size: Large, Color: Navy Blue
The jacket was a perfect fit, the pants were a little long. Material was nice, and well put together. Overall I was very pleased with this suit for my wedding.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 24, 2025
N
Verified Purchase
Nate s.
Lexington, US
★★★★★ 5
Amazing suit for the price
Size: Large, Color: Black
So I didn't really need a suit for anything. But I've been wanting one just in case. As such, I wasn't willing to spend a lot. Yet I still wanted to look good when I wore it. This suit is amazing. I honestly would fit between a medium and a large, and with my current trend down in weight, I may buy an additional in medium(I mean, for under $100, why not?). While my shoulders have always been a little wide for what fits my waist, the large seems to accommodate even more than I need. I worry if the medium will be too tight, but that's for another day. The pants are a little long, to be expected considering I generally wear 30' pants. Easy to hem. The vest seemed a little loose, until I found the adjustment in the back. Now it is perfect. I may still need to go to a tailor for a more custom fit, but for the price it can't be beat. And I of course haven't tied a tie since I was 16, so time to relearn that. As far as quality goes, the fabric and stitching all appear to be excellent. I went with the black, as I don't particularly look great in gray, and navy out here seems more suited for church than anything else. The quality of black is excellent. The quality of the pants is good, but I will still be favoring my dress pants that already fit well. I especially love the angle of the beast cut(whatever it is called). Whether I choose the vest or not, the black contrast with all of my dress shirts is fantastic. I will include photos sometime when I'm not too self-conscious about taking selfies.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 22, 2024
T
Verified Purchase
Tamara A. Price
San Leandro, US
★★★★★ 5
Really amazing suit that looks like a million bucks!
Size: Large, Color: Black
This is the second suit we bought by Lupurty. The first was dark navy and fit so well and looked so good that we got one in black for our son’s wedding!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 30, 2026
M
Verified Purchase
Maddisun wiles
Charlottesville, US
★★★★★ 1
Disgusted!
Size: Small, Color: Black
I’m disgusted! I ordered this for my boyfriend to wear to prom. I ordered him a small and the jacket and the vest were not smalls, they look like they were a large. All three pieces had dog or cat hair on them and the jacket had dirt stains on the inside. They were all used! And some of the stitching was coming out! I’m so glad I received it the same day I bought it, because if received it closer to prom I would have been so screwed!!! Do not buy this or buy from this brand! Terrible product!!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 10, 2026
S
Verified Purchase
spartan
Belleville, US
★★★★★ 5
Dress to Impress: Sharp, Tailored Fit, Quality Material, and Sizing Tips
Size: X-Small, Color: Navy Blue, Size: X-Small, Color: Navy Blue
This review is for the LUPURTY Men's Suits Slim Fit, 3 Piece Suits for Men, 2 Buttons Solid Jacket Vest Pants, Tuxedo Set (XS navy blue and black sets). I bought the XS knowing my son's measurements were actually below the size guide for that size, but I'm glad I did because it still worked out. The suit was a bit big—especially in the pants, which were quite long, and slightly roomy in the shoulders and arms—but it still looked sharp and well put-together. The overall fit has a clean, tailored appearance despite the extra room. The material feels high-quality and the color is true to what’s shown online. I do wish the black suit came with a black or gray tie instead of blue, which didn’t quite match. The suit in the photos is the navy blue set that my son wore to his 8th grade graduation, which matched their school colors perfectly. I also included my son’s measurements to help others with sizing: Weight 114 lbs Height 5'3" Chest 30.5" Waist 29" Hip 35" Sleeve length 21.5" Shoulder 17" Inseam 29" Back length 18.5"
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 9, 2025

recommand products