⭐ Review SweetVinyl SugarCube: A vinyl game-changer

My quest for "clean records" started as far back as the early 1980s. Let's be honest--pops and clicks have affected records ever since the Edison cylinder. I have purchased many records that had almost no noise whatsoever, whereas other records really needed some serious help, even when they were first played out of the shrinkwrap. Once I got into purchasing used records, the problem could sometimes be worse, depending on condition. That and records I had from years past, which were never cared for too well, certainly needed some attention.


Record cleaning.

Physical cleaning is part of the battle. An Audioquest carbon fiber brush, a Discwasher, etc., will knock off loose dust and dirt but does nothing for the crud embedded in the grooves. I'd started with a record vacuum back in the early 90s, and progressed to an automated ultrasonic cleaning system not too long ago. Getting the records cleaned does more than reduce noise--it lengthens the lifespan of the record as well as the stylus playing it. Dirty records act like sandpaper, in other words, and embedded dirt pressed into the grooves will further damage the vinyl itself.

After cleaning, I replace the original sleeve with a "rice paper" sleeve, to keep any dirt or dust from the original sleeve from getting back on the record. (The original sleeve is then stored alongside the new sleeve in the LP jacket.) Since record cleaning is as much science as it is experimentation and guesswork, I will leave that discussion for another time.


Noise removal.

I've been down a few rabbit holes in trying to remove the clicks and pops from records. The first such rabbit hole was by way of the SAE 5000A Impulse Noise Reduction System, an electronic component designed to remove clicks and pops.

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KLH (Burwen Research) also sold a similar device, the TNE 7000 Transient Noise Eliminator, which I'd only heard of but did not purchase.

Both units worked on a similar premise--certain types of noises could be eliminated safely. Theory being greater than execution, the SAE 5000A did work, but after the novelty wore off, it could be tricky to use on some recordings, impossible to use on others, and it added an overall faint dullness to the sound that made it suitable only for severely worn records that were already in sad shape, or for making cassettes for the car.

Once software solutions came along, via plugins for various audio editors, my technology game improved somewhat. I began using the professional Waves click and crackle plugins rather early in the game and while they worked better than the SAE unit, I still heard artifacts I didn't like. In recent times I have also tried the Izotope plugins and didn't fare much better. They could work, and to a casual user they were probably good enough. Yet once the shortcomings are pointed out, they are hard to unhear. I've heard samples of those $59 "vinyl cleanup" software packages and the results, at best, are dismal.


A 21st Century solution?

Enter 2017, and the SweetVinyl company. At the audio shows, the SweetVinyl team debuted a device that would clean up clicks and pops, using a dedicated component running proprietary software. I didn't hold out high hopes for it at first, due to past experience with software solutions, but original write-ups from audiophiles with better ears than mine were extremely impressed.

Usually, the rooms at AXPONA were too busy to get a good demo but in 2019, I finally had a chance to sit down and hear a demo of it in action. Prior to the "official" demo, a quiet classical recording was playing from vinyl from a nearly silent background, without the slightest tick or pop present.

The official demo consisted of a used copy of Steely Dan's Aja. Full of numerous pops and clicks, with SweetVinyl's Leo Hoarty demonstrating how the system worked. Here is a video of that demo:


The SugarCube is a software solution that runs on an internal computer, processing audio at 24-bit/192kHz resolution. The software is proprietary, developed and refined in-house. The unit can connect into an audio system in a variety of places, the most common being between the phono stage and preamp, or in a system's tape monitor or external processor loop. The higher models in the product line have digital outputs that can connect to a DAC (digital to analog converter) or a computer via USB, either for playback or digital recording. And speaking of recording, the SC-2 models (the SC-2 Mini and the SC-2 Plus) will record audio to a USB thumb drive, with the ability to look up the album via the Internet and split and tag the resulting files.

1643921339090.pngAll units connect to your home network, either by WiFi or Ethernet, so you can control the unit's settings from a smartphone, tablet, or web browser.

The SugarCube couldn't be easier to operate. Click and pop removal is engaged from a button on the front panel, and a rotating knob lets you set the amount of removal. When powered up, the initial setting is at the middle of the range. If you find the unit is removing parts of the music, the control can reduce the processing level. Likewise, if you still find noise getting through, increase the level until the noise is eliminated.

The "Plus" models (SC-1 Plus, SC-2 Plus) also offer SVNR--SweetVinyl Noise Reduction--which can remove some examples of background noise. To use this, engage the SVNR system, start playing the record via the lead-in groove (so the system can take a sample of the vinyl with no music), and it automatically adjusts to work on the background noise. You can adjust the level of noise reduction through a slider. Controls for SVNR are available only remotely (phone/tablet/browser).

The overall product lineup consists of six models. The least expensive is the SC-1 Mini, which offers the click and pop removal. The SC-1 Mini/Phono adds a phono preamplifier, which is great for someone with an auxiliary input on their component but lacking a phono input. The SC-2 Mini adds the recording and metadata-lookup capabilities, and the SC-2 Mini/Phono again adds a phono stage. All of the Mini models are in a narrow "desktop" size. The SC-1 Plus and SC-2 Plus are packaged in larger enclosures. Both add the SVNR feature and digital outputs (optical, coaxial, USB), digital input (which can be attached to a computer), and the SC-2 Plus adds the recording/metadata-lookup.


But does it work?

I have had the opportunity to live with the SC-1 Plus for a couple of months, the result of more than a year of watching for the right deal to come along. SweetVinyl, unfortunately, is sold out, the current supply chain issues causing a delay in manufacturing. And used units are few and far between--I'd had a saved search on HiFi Shark for . It was an eBay auction, with few bids, and the help of an auction sniper program that I was able to score one at a substantial discount.

Since then, it has lived in my system. And having used it continuously, I can't see listening to records without it. It's no wonder these rarely come up on the pre-owned market--they work very well. This is the first product I have used that leaves no trace of itself on the sound quality. The internal digital converters themselves are high quality and even with those, owners and reviewers with better ears than mine heard no alteration to the music. I run mine to my external DAC for good measure and I, too, cannot hear any difference between the input and output.

Except for the click and pop removal.

The SC-2 Mini/PhonoI've spent the past couple of months rediscovering many records in my collection I had given up on. Some were underwhelming used record purchases that cleaned up nicely, the clicks nicely removed with no ill effect. Even on new vinyl that might have the occasional tick here and there, it works exceedingly well. I find it indispensable, to be honest.

I have not yet tried the SVNR feature too much, nor have I had time to get it properly connected to my streaming computer so I can record directly to a disk. But in initial testing, the SVNR works less intrusively than any other background noise reduction I have used. I still find it can give the music a "closed-in" feeling if it is applied too heavily. Yet it works well on older records that might have a lot of noise.

Is the unit's noise reduction perfect? No. There are still types of noise that cannot be cleaned up by any method. Scuffs in the vinyl, which result in a sort of "white noise," cannot be removed. Neither can groove burn (worn vinyl). Both do not contain the type of information the system would need to correct it, as it would be too hard to distinguish these noises from actual music.

Yet the noise it does remove it impressive, if not remarkable.


The SugarCube in action!

I have uploaded a series of short videos to YouTube which demonstrate the click and pop removal operation of the SugarCube. Rather than post five videos, I have combined them into a single playlist. Below the video are some details about each video.


  1. Pete Jolly: "Little Bird" is the title track from this album. I have been through two copies of this LP, graded "NM" by Discogs sellers, and as you'll hear, the condition is anything but Near Mint. Both copies are as bad, yet visually they do not look all that troublesome; I get the impression that Ava Records may have had issues with their vinyl pressings. (The only available CD of this title is a needle drop, in mono, with a couple of tracks appearing to be in stereo but with weird phasing issues. Both stereo LPs sound this dull too, unfortunately.) This sample shows the SugarCube in three modes--bypassed, processed, and monitored (where we can hear the noise being removed).
  2. A new Tone Poet Blue Note release of a Horace Silver LP. Only light ticks here and there, but you'll hear how they are easily removed, and the music is left unharmed. This video has before and after samples.
  3. A mid 70s reissue of a classic Los Indios Tabajares LP. The sparse instrumentation demonstrates how much cleaner the record sounds through the SugarCube. This video has before and after samples.
  4. The first torture test. I unearthed this record from 1954 among my parents' older records that were kept in their basement, and photos in the video show the condition it was in. As you'll hear, there is still some noise behind the music, but just about all of the clicks and pops are gone, and we can more clearly hear the music.
  5. A second torture test is another LP that was a bit neglected in the basement collection, yet one I grew up listening to occasionally. There are no before/after samples here, just the repaired audio. (A full upload of the 14-track album will happen in the near future.)

I had originally intended to use the SugarCube to archive records to digital, primarily, the hundreds of records I own that have never had a digital release. This would save me many hours of having to apply software noise reduction, often adjusting it for each track to get the most out of it. After living with it in my system for a couple of months, I find I am using it on everything. It's that good. And it is also that convenient, as I no longer have to go through all the hoops of transfering a record to digital, processing it (sometimes section by section), splitting and tagging the files, and storing them on the server. I can put on a record now and play it in real time, with the clicks and pops handily removed.

This is definitely a game changer in vinyl playback.
 

Rudy

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The best money I ever spent. Love my SC1. I cannot imagine life without it.
Agreed! I've gotten so used to it that when I buy used vinyl now, I'm sometimes surprised when the SugarCube is deactivated and I hear how many ticks it has. 😁 The fact that it works in real time is the real game changer--I don't have to record an album digitally, clean it up, then listen to it through my system digitally. I can put on any record I own and it is automatically cleaned.
 

GDBY2LV

Well-Known Member
It’s a shame there aren’t any available right now, or who knows when? Pro-ject has a new box out, but no owner reviews yet. A few audio magazine articles. I’m not quite sure it really works. About $400.00.
 

Rudy

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I had a poor ownership experience with a Pro-Ject product, so I wouldn't be all that enthused to own anything of theirs ever again. I can't help but think it may be a box with a Raspberry Pi mainboard and some pre-existing click/crackle reduction plugin that has been rebranded by them.

Someone on another forum posted a DIY version that used the Izotope click-reduction plugin, and while it's good, it's not transparent in its operation (as none of the computer-based filter plug-ins seem to be, and I've tried them all, even the professional Waves filter package).

The SugarCube, so far, is the only one that is transparent. They developed a proprietary filtering software stack for the SugarCube, which unfortunately adds to its higher cost. They also use a high-quality ADC and DAC internally so the conversions from analog to digital, and back to analog after processing, are as transparent as possible. The amusing part is that many audiophiles, even including a few locally that I know who are diehard vinyl listeners who rarely touch anything digital, can't even tell when it's in the system. (Unless it is mis-adjusted.)

The only way to score a SugarCube right now is to go to hifishark.com and enter a saved search. Then you'll be notified when one shows up for sale on any of the popular sites (Audiogon, US Audio Mart, eBay, etc.). eBay is how I managed to grab one at a really good price.

I just hope they are doing OK as a company, as they haven't had stock for over a year. Dan and Leo still respond to my occasional emails, but I have a feeling the global supply chain issues have bitten them hard.
 

Electroliner

Active Member
Rudy,

Do you know if the sugar cube supports custom software defined eq curves for various 78 rpm records? Obviously we have the RIAA standard for 33 & 45s.
Different record labels employed their own eq curves for 78s. I remember reading about a device 40 yrs ago that provided this functionality. However, it was very expensive.
 

Rudy

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Rudy,

Do you know if the sugar cube supports custom software defined eq curves for various 78 rpm records? Obviously we have the RIAA standard for 33 & 45s.
Different record labels employed their own eq curves for 78s. I remember reading about a device 40 yrs ago that provided this functionality. However, it was very expensive.

It actually does have a couple of different EQ settings for 78 RPM records--it's one of the features on the SC-1 Plus and SC-2 Plus (along with the SVNR--SweetVinyl Noise Reduction, which removes background noise from "old" sources).

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The settings for LPs are from the early days of mono LPs. I guess once things became standardized by the late 50s and especially once stereo LPs came along, they all used the RIAA curve (which I believe was based on what RCA was using with their New Orthophonic LPs).

For what it's worth, I haven't yet tried a 78 RPM record through the SugarCube. I have to find a spare headshell and the 78 RPM cartridge/stylus (I had one in a Shure M44 body). Luckily the new turntable (SL-1210G) has a 78 RPM setting on it. Saves me dragging an old turntable up from storage.
 

GDBY2LV

Well-Known Member
Good luck finding one. I think I saw one of those models for about $3,000 + on line. Ouch!
I used Rudy’s suggestion, and source for equipment, and found the SC-1 for sale in England. It arrived a few days ago, and after much tinkering, ordering a preamp, and calibration with the record it comes with, etc. I can say it was worth the expense. I can listen to my vinyl with only a pop or two, on each side. It even makes the UMe vinyl okay. Especially the Carpenters RPO records. It even cleaned up about 50% of the distortion on Someday. Thank you Rudy for your help, and information with the set up. It really is an incredible invention, that actually works. FYI, It will not take out the groove noise, or sound between cuts. Just pops and tics. A real friend for vinyl junkies.
 

Rudy

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I know a few who own these, and once they have the SugarCube in their system, they don't want to live without them. Even today, I still find myself pulling out records I had given up on, and it also takes away some of the worry about buying used records that aren't as advertised. Some hardcore audiophiles even remark at how transparent the unit is--it adds or subtracts nothing to the sound...except the noise.

I just wish they could sell these for less money, so more of our A&M Corner friends could enjoy them. They do work better than any software-based product I've used, and I've tried many, even expensive professional-grade plugins. But with the higher-quality components inside, and developing their proprietary software in-house, I doubt they will ever get much less expensive. The entry level for new units is the SC-1 Mini, and unfortunately with the supply chain issues, they've been out of stock for well over a year, with only an occasional unit appearing on sites like Music Direct very briefly before they sell out (a matter of hours).
 
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