SKU: 10824549458

Modulus-86 10th Anniversary Edition

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Description

Modulus-86 10th Anniversary EditionThe Modulus 86 is a 65 W, Class AB, LM3886 based power amplifier with error correction provided by an OPA627 precision opamp. It delivers clear, precise, and non fatiguing sound; and distortion well below 1 ppm at full power. This 10th Anniversary Edition features improved performance, in part due to the further optimized PCB layout. A limited stock of high spec OPA627B opamps is available in DIY friendly packages: 25 kits with the TO 99 (metal can)

The Modulus-86 is a 65 W, Class-AB, LM3886-based power amplifier with error correction provided by an OPA627 precision opamp. It delivers clear, precise, and non-fatiguing sound; and distortion well below 1 ppm at full power. This 10th Anniversary Edition features improved performance, in part due to the further optimized PCB layout.

A limited stock of high-spec OPA627B opamps is available in DIY-friendly packages: 25 kits with the TO-99 (metal can) and 65 kits with DIP-08. The Kit will be discontinued when this stock runs out.

The 10th Anniversary Edition retains the same PCB size and mounting hole locations as Modulus-86 Rev. 3.0, allowing for a direct replacement.

Technical Documentation

  • Description
  • Key Specifications
  • Circuit Topology
  • Downloads

  • Key Features

    • Genuine parts sourced from authorized distributors or directly from the manufacturer. All boards and parts needed for a stereo pair of Modulus-86 are included.
    • World class performance ensured by an error correction circuit with local, low-noise power supply regulators.
    • Power supply agnostic by design. High performance is attained with unregulated power supplies and with switch mode supplies.
    • Differential (balanced) input which eliminates hum and ground loop issues. Can be used with single-ended (unbalanced) sources as well.
    • On-board EMI/RFI input filter and ESD protection.
    • Four-layer PCB optimized for high signal integrity. All ground management is handled on the PCB.
    • The circuit board is made in Canada and has been fully electrically tested by the manufacturer.
    • All through-hole construction.

    Build difficulty (1-5): 3 (moderate).

    To successfully build this Kit you will need decent soldering skills and the basic hand tools used in soldering. You will need to be able to correctly identify the different parts from the markings on the parts. These markings are in the form of colour codes on resistors and 3-digit codes on ceramic capacitors. The assembly guide contains all the information needed to identify the parts. Note that the markings on the parts are pretty small, so having a magnifying glass or loupe handy can be helpful. Similarly, access to an ohmmeter is helpful for telling the resistors apart.

    The OPA627 is no longer manufactured in the two DIY-friendly package options available with these Kits. Furthermore, the TO-99 (metal can) version is soldered directly into the PCB whereas the DIP-8 version is socketed. As result, I recommend that those who attempt to build the 10th Anniversary Edition of the Modulus-86 have at least a moderate level of experience. This is especially true for builders of the TO-99 version.

    The build video below shows you how to build the Modulus-86 10th Anniversary Edition amp modules. Please watch the video to gauge the skills needed.

  • The graph below shows the THD+N vs output power for the Modulus-86 10th Anniversary Edition.

    The table below lists the key specifications for the Modulus-86 10th Anniversary Edition. For the full specifications, please see the data sheet on the Downloads tab.

    Parameter Value Notes
    Output Power 65 W 4 Ω, < 0.01 % THD+N
    Output Power 40 W 8 Ω, < 0.01 % THD+N
    THD

    -127 dBc

    (0.00004 %)

    		 40 W, 8 Ω, 1 kHz
    Multi-Tone IMD Residual ≤ -135 dB Ref.: 40 W AP 32-tone, 40 W, 8 Ω
    Total Integrated Noise and Residual Mains Hum 14.1 µV RMS 20 Hz - 20 kHz, A-weighted
    Gain 20 dB Can be increased by adding a resistor
    DC offset

    ≤ ±25 µV

    ≤ ±140 µV

    Typical

    Guaranteed by design
    Finished Assembly Dimensions and Weight

    91.2 × 69.7 × 27.5 mm

    90 g

    (W × D × H)

     
    Recommended power supply Power-86 with 2x22 VAC, 160-300 VA power transformer
    All parameters are measured at a supply voltage of ±30 V DC.

  • The block diagram of the Modulus-86 10th Anniversary Edition is shown below.

    The Modulus-86 10th Anniversary Edition uses an OPA627 to form a balanced composite amplifier with the LM3886. An LM4562 is used for the differential input. The LM4562 can be replaced by any unity gain stable opamp, including many discrete opamps, should you desire to experiment with other opamps.

    The differential input can be used both with differential signal sources (XLR) and with single-ended ones (RCA).

    The Modulus-86 is power supply agnostic by design. This is unique to the Neurochrome Modulus amplifiers. Due to the error correcting composite amplifier topology, the Modulus-86 performs as well on a traditional unregulated linear power supply or a switch mode power supply (SMPS) as it does on a well-regulated laboratory power supply.

    The PCB layout is crucial at the performance levels attained by the Modulus-86. The four-layer PCB employs differential signal routing and carefully designed copper pours and planes to ensure optimal circuit board performance. 

  • Design Documentation

    Modulus-86 10th Anniversary Edition Design Documentation: MOD86_10AE_R1p0_DesignDocumentation.pdf

    Data Sheet

    Modulus-86 10th Anniversary Edition Datasheet: MOD86_10AE_DataSheet.pdf

Shipping Notes
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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]
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SKU: 10824549458

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4.2 ★★★★★
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C
Computer
Alexandria, US
★★★★★ 4
Easy to assemble, does the job, material is shiny nylon and shows creases, minor defects, sloppy
Size: 3 Panel 12FT W, Size: 3 Panel 12FT W
The Siebwin room divider is a good idea, and for the price, it mostly delivers on the intended functionality. I ordered the 12 foot, 3-panel version mainly to hide an unfinished basement storage area that had become an eyesore. It works well for that purpose and gives the space a cleaner appearance without spending the kind of money that more decorative dividers or custom partitions cost. If you need something temporary, portable, or mainly functional, this is a viable option. There are a few limitations that became obvious during setup and use. The first thing I noticed was that the weld quality on some of the metal poles is fairly sloppy. Once the cover is installed, you do not really see it, but up close, it does not look especially refined or professional. The blackout material also is not a matte canvas style fabric as I expected. It has more of a shiny nylon appearance, and the creases are fairly visible. Being that it’s more of a nylon, I’d be hesitant to try steaming it to remove the creases. However, the creases do not matter if you are using it in a basement, dorm, or shared room, but for photography, video work, or a professional office setting, the appearance could be disappointing. The fabric is thick enough, though. It blocks visibility well enough, but strong light behind it still shows through to some extent, nothing deal-breaking. Also, my fabric appeared to be slightly defective. The hook and loop strip on one of the bottom sections was off-center and couldn't be totally attached because it was lined up with one of the legs. I originally hoped to use this as a video backdrop, but I will probably end up replacing the fabric with a proper green screen or canvas material while continuing to use the frame itself. For now, it does a good job of covering my basement junk. Assembly was actually easier than I expected and took roughly 15 to 20 minutes. The longer vertical poles are tethered together similarly to tent poles, which made setup straightforward and fairly intuitive. The shorter horizontal pieces slide and snap together to the top and bottom of the vertical assembly. After each section is assembled, the divider panels connect together with metal plates and two knurled screws (at the top and bottom), so no tools are really required. A few screws were difficult to start because paint had gotten into the threads, but once they caught, they tightened down normally. The feet install with similar knurled fasteners and help keep the divider reasonably stable. One thing to watch for during setup is the fabric orientation. There is one arrow indicator in the middle of the fabric to indicate up. However, if you need another indicator, the smaller hook and loop strip goes on the bottom while the longer strip goes on top. I realized mine was upside down right before finishing and had to redo it. I wasn't difficult to redo, despite the defect in mine. The overall design is practical and easy to move around. I do like that the panels can fold and bend into different shapes depending on the space. The widened feet help stability, although when trying to stretch the fabric tight, I noticed the poles sometimes wanted to overlap slightly at the joints. Tightening everything helped somewhat, but it still happened occasionally. The divider feels adequate for normal indoor use, though I would not expect premium durability or luxury-level fit and finish at this price point. The entire device can also be easily disabled and stored in a tote if you need it completely out of the way. It comes with assembly instructions, but even if you didn’t have them, it’s easy to build without them (save a mistake or two). In terms of value, I think the Siebwin divider mostly matches its price. Around $100 gets you a large freestanding partition with decent usability and easy assembly, but there are compromises in materials, appearance, and refinement. The defects are also off-putting, but hopefully you won't have them. Higher-end room dividers can easily cost two or three times more, so some of the tradeoffs are expected. I also noticed cheaper alternatives online, but based on the quality here, I suspect those would probably have even more issues. For practical home use, temporary privacy, hiding storage areas, or separating shared spaces, this is a good option as long as expectations stay realistic.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 18, 2026
T
Trendy Tales
Alexandria, US
★★★★★ 3
Works well but takes up more space than expected
Size: 2 Panel 8FT W, Size: 2 Panel 8FT W
This room divider does the job for creating a little extra privacy and was easy enough to set up. The panels feel decent quality and the wider feet help keep it more stable than some cheaper screens I’ve tried. My only issue is that it takes up a bit more room than I expected, especially with the feet sticking out. It’s still portable and folds away nicely, but definitely measure your space first. Overall it works well for separating a room or blocking off an area temporarily. i wish it came in other colors
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 26, 2026
K
Katrina Rhodes
Lowell, US
★★★★★ 5
Nice divider, serves it's purpose well!
Size: 3 Panel 12FT W
This room divider worked out very well for what I needed. I wanted a simple way to create a little more privacy and separation in a larger room without doing anything permanent, and this divider was an easy solution. The panels provide good coverage, and the black color gives it a clean, modern appearance that blends in nicely with different décor styles. Assembly was fairly straightforward, and once set up, the wider feet helped keep the divider stable on the floor. I was especially happy with how flexible the panels are to arrange. You can keep it mostly straight, angle it around furniture, or create a more enclosed private space depending on the layout you need. The material allows light to filter through slightly while still offering a noticeable sense of privacy. I’ve used it for separating a workspace area, but it would also work well in bedrooms, apartments, dorms, studios, or shared living spaces. Another plus is that it can be folded and moved without too much effort when you want to change the setup. Overall, this divider delivers a good balance of functionality, portability, and appearance. It’s a practical option for anyone needing temporary room separation without installing permanent walls or curtains.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 26, 2026
J
Jamie K.
Cuba, US
★★★★★ 5
Perfect for Adding Privacy to a Piano Studio
Size: 2 Panel 8FT W, Size: 2 Panel 8FT W
I Ordered the 2 Panel version which is way too big for my needs... that's on me. So keep in mind that the picture shows a fabric made for two panels only being used on one and hence it is not pulled tight; it would pull tight and not be so wrinkly if it was set up properly as two panels. The metal pools that make up the panels seem to be well made, stable, and of good quality. They were very easy to put together and they stand up tall with plenty of height. The appearance of it with the fabric on it isn't as elegant as it could be, but it still looks good enough. The material is plenty solid, not allowing light through it, and thereby making a solid barrier. I am using it to block the view out the studio door when a student is sitting at the piano to avoid distractions from the hallway. It will allow a student to enter the studio with our distracting the student who is at the piano.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 18, 2026
J
Just Me
Waukegan, US
★★★★★ 5
Room Divider That Gives Instant “This Is a Separate Space Now” Energy
Size: 3 Panel 12FT W
The Siebwin 3 Panel Folding Privacy Screen is surprisingly effective at changing the feel of a room without requiring construction, commitment, or somebody yelling about load bearing walls. The 12 foot width gives a substantial amount of coverage, making it useful for creating privacy, dividing open areas, blocking visual clutter, or setting up temporary sections within larger rooms. This saved us a ton of time and money in our new studio and enabled us to create a kitchen and office in one room. The wider feet make a huge difference because flimsy room dividers that collapse every time someone exhales too aggressively are deeply annoying. This one feels more stable and grounded once positioned. The folding design makes it easy to move around or adjust depending on the space, and it folds down relatively compactly when not in use. It is basically the introvert curtain wall of dreams. The material has a clean, neutral look that blends well into different room styles without screaming “temporary office cubicle panic.” It works well for apartments, studios, shared spaces, dressing areas, or simply hiding the mountain of chaos you swear you are going to organize tomorrow. Practical, portable, and refreshingly easy to use without turning setup into a three hour emotional event.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 16, 2026

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