SSL SSL2+ 2-In/4-Out USB-C Audio Interface

In January of 2020, Solid State Logic (SSL) introduced two desktop audio interfaces, the SSL2 and the SSL2+.If you are an audio engineer, you are no doubt very familiar with SSL. You’ll find their mixing consoles in most major recording studios, and more number one hits were recorded with SSL equipment than with any other brand. Their 4000 series is particularly coveted.Now, what SSL has done is condense everything the brand is known for in a compact, affordable package. I’m talking about solid build quality, pristine analogue microphone preamps, and super clean 24/192 kHz conversion. I’m talking about low-latency monitoring, high-performance headphone preamps, and a special Legacy 4K button.Each preamp has a 5-segment LED meter for visual level reference. You can plug in microphones that require 48V phantom power, but you can also use ribbon and dynamic microphones like the Shure SM7B without needing a Cloudlifter ($150 in savings right there!). That’s because the preamps have an ultra-low noise floor of -130.5 dbu EIN, and offer a gain range of 62 dB. That’s enough for very detailed and clean recordings.In the back there are two studio-grade Neutrik mic/line combo jacks, and two 1/4″ outputs for your studio monitors. In addition, the SSL2+ has two 1/4″ headphone outputs as well as MIDI I/O over 5-pin DIN jacks. You’ll also get two pairs of RCA outputs with the 2+ to attach some outboard gear.THE MAGIC NUMBER ELEVENMost voice overs will be quite happy with the cheaper SSL2. I chose the 2+ because I’ve always wanted an interface I could plug two headphones into. My Beyerdynamic DT880’s, which I use for recreational listening, and my Austrian Audio Hi-X55’s which are my editing cans.What I also like is that both units are USB-powered (USB C & A). No more ugly power brick. If you have an Apple computer like I do, the unit is plug and play. If you’re a Windows fan, just download the ASIO/WDM Driver and you’re in business.Esthetically speaking, these interfaces have the familiar SSL look and color scheme with a simple, logical setup for the knobs. I particularly like the big blue monitor level knob which goes to…. eleven!Speaking of the exterior, what’s this 4K Legacy button all about? SSL puts it this way:"Engaging this switch allows you to add some extra analogue ‘magic’ to your input when you need it. It injects a combination of high-frequency EQ-boost, together with some finely tuned harmonic distortion to help enhance sounds. This enhancement effect is created completely in the analogue domain and is inspired by the kind of extra character the legendary SSL 4000-series console (often referred to as ‘4K’) could add to a recording."Of course that’s just the company talking, so what do I find of this 4K effect? First off, it’s not a miracle cure for bad audio. I’d call this effect a subtle sound colorizer that’s actually quite pleasing to the ear. It adds some mojo to your mix, especially if you’re using a dark sounding microphone. Mind you, once you’ve recorded in this mode, you cannot undo the effect like you would with a digital plugin.To hear the difference, here’s a short recording, first without 4K and then with the switch engaged. Lastly, you’ll hear me line by line without, and then with 4K. I’ve used my new and “darkest” sounding microphone, meaning the one that accentuates the lows in my voice.IT WORKS OUT OF THE BOXWhat I like about the SSL2 and 2+ is the fact that these units are pretty much self-explanatory. There’s no need to go into a virtual mixer (as was the case with the iD22) and fiddle around with different settings. Everything just works as advertised. The online user guide is easy to follow -even for beginners- and SSL support is very responsive and eager to help.By the way, these SSL desktop interfaces also come with free digital audio workstations like Pro Tools First and Ableton Live Lite (plus some other cool stuff for those who are into music production).PROS AND CONSLet’s end this review with a list of what I liked and liked less. I’ll start with what I liked less about the SSL2+.The housing seems sturdy, but it’s part plastic, part metal. Audient (their main competitor) makes all-metal units, but they are more expensive (the iD14 model is about $300 with fewer features).There’s no on/off button. What’s up with that? My Audient iD22 didn’t have one either. It’s less of a problem with the SSL2+ because it’s bus-powered, so it turns off when you shut your computer down.The cord connecting the unit to the computer is too short. My preamp sits to the right of my iMac, and I needed a longer connection. I just don’t like it when you’re excited to try out a brand new piece of gear, and you can’t because of a short stupid cord.The LED’s don’t show enough dynamic range. It’s a five-step ladder LED meter going from -40 to 0, and I’d like to see a few more intermediate steps. It’s not a deal breaker though, because most of us will set the gain looking at our DAW.The headphone sockets are on the back. I prefer to have more direct front access. That way, the cords don’t get entangled in a mess of wires.The 48V phantom power buttons are black and small and they don’t light up when engaged. In poorly lit surroundings it’s not always easy to see if these buttons are pressed down.Unlike my iD22, the SSL2 and 2+ units don’t have a high-pass filter which I think is a useful feature if you want to cut down on low rumble in your recordings (and your microphone doesn’t have that switch). I’ve attached a Shure A15HP – In-Line Hi-Pass Filter to my unit and it does the job, but you can also filter your audio with a plugin in post.I’ve read reviews that don’t recommend using low-impedance headphones with these units. Nonsense! My Austrian Audio Hi-X55 cans have a low impedance of 25 ohms, and sound magnificently detailed through the SSL headphone amps.And then there’s the Legacy 4K effect. Some reviewers love it and won’t record anything without it. Others think it’s just a gimmick.Now for the pros.By building these interfaces in China, SSL was able to put them on the market at an insanely low and very competitive price. The SSL2 is a little over two hundred dollars, and the 2+ comes in under three hundred. This includes the production pack software package.These may be entry level units, but they definitely bring superb Solid State Logic sound quality to your home studio. The overall no-frills design is intuitive and just makes sense. I like the sloped shape, and the controls are smooth and sturdy. This plug and play audio interface is easy to use. You don’t need an external power supply, and yet it has enough oomph to go to 11, and feed a dynamic/ribbon microphone!CONCLUSIONIn short, the SSL2 and SSL2+ offer outstanding value for money. Don’t let the audio snobs talk you into buying expensive boutique preamplifiers. Spending more cash doesn’t automatically mean your sound quality will get exponentially better.In fact, the more money you spend, the smaller the audible improvements will be. Who are you trying to impress? Your Facebook friends or your Insta-buddies?Give me a break!For a little over two hundred bucks you can get all you need to power your voice over studio with pizzazz!What’s more, you’ll feel very good about having saved some hard-earned money.And that’s a logical, solid state to be in!

I bought this because of the percentage of positive user ratings and SSL brand reputation. It replaced a MOTU M4, which was OK but sounded a bit hard-edged and constantly drifting audio levels in monitor and main outputs.The SSL was a breeze to install and setup. I find the sound to be more balanced and warm, and the controls are stable.I've only performed audio editing so far and haven't engaged the "4K" feature.Overall I'm really pleased with it--a keeper.

Take it from me, the SSL 2+ destroys higher end microphone preamp‘s and audio interfaces. I have the popular Audient ID22, famously known for it's quiet preamp‘s and also an iconic dedicated microphone preamp the Focusrite ISA One. I’ve used each directly through it’s own microphone preamps and also routed through the inserts directly hitting the Audient converters to the ISA ONE. Both of these are not as good as compared to the SSL 2+ microphone preamp‘s. I am kicking myself right now for spending more money thinking that more expensive equals better. The Audient ID22 is absolute garbage compared to the SSL 2+ and even the ISA One is no match. This audio interface should be at least $500, I don’t know how SSL does this but this is beyond remarkable. They have literally changed the game! And don't even get me started on that magical 4K button, it's pure GOLD! I have my setup hooked up in an acoustically treated room using high end Adam A7 monitors and an RE-20 and SM7B dynamic microphones.I also tried the Motu M4 audio interface and although I did enjoy the visual metering, the microphone preamp’s were so garbage that I immediately sent it back. So my advice is the following:Get the SSL2 or SSL2+ (the preamps are the same), some good monitors, and stick to a good dynamic microphone. (Condensor microphones IMO should be used for professional work like Audiobook narration and Voice-Overs or if you have a professional grade recording studio with proper treatment which leads to my next point. Your MOST IMPORTANT and BIGGEST expense should be on treating your room appropriately with acoustic panels. Dynamic microphones are more forgiving than condensors for a bad room but still, nothing and I mean absolutely nothing will give you better results than a properly treated room. You can spend $3000 on a microphone and another $2000 on a preamp but if your room is not treated properly it will sound no better than $100 because you will get a lot of echo and reverb which will sound terrible on your recording. You want your sound to be as quiet as possible which ONLY proper room treatment will give you.

The sound is impeccable for a device not only in this price range but possibly 3x as much. I also own and use RME equipment, but for a small, lightweight, portable great sounding interface, it can hardly be beat. It has knobs spaced out to where you can turn them without crashing into something else. No software, no gimmicks, no hassle. Easy to use.The biggest downside to me is that it is a USB powered interface. It does not have an isolated power supply of its own. Personally, I despise USB. It may be ok for mice and keyboards but it is a disaster for audio. Always has been and always will be. It's not the direct fault of the device, but all USB audio devices in general (combined with today's generation of motherboards) when supplying power to the device - USB ground loops. USB is today's equivalent of the old RS-232 cable nightmare of the 80's and 90's. Nothing is easy. Too much hassle to get something so simple to work properly. Bah!