Amp Modeller and Impulse Response Cabinet
Leave Your Amp At Home!
Based on* a Fender® Deluxe Reverb
The Deluxe is one of the most recorded amps in history for good reason. This amp is clean, bright, and mid-scooped, with plenty of headroom. At higher Drive settings it delivers an overdriven sound unique to its architecture. We chose the Deluxe’s Normal channel for its round tone that plays well with pedals. While preserving access to all the tones originally available with this channel, our model gives you something extra: a midrange control. With the midrange at noon, you get the original fixed-resistor value and standard tonal characteristics of the Deluxe. Turn down the midrange for a more scooped sound, or turn it up for tweed-era tones.
Based on* the Brilliant channel of a Vox® AC30TB
The amp that defined the guitar sound of the British Invasion. Our model of the AC30TB Brilliant channel is jangly, bright, and chimey, providing air for subtle passages with a light touch, and bite when you want to dig in. For this amp, the Middle knob acts a Tone Cut knob, providing high-end roll-off just before the power tubes, per the original AC30 design. In addition to the full available gain of the original amp, toward the top end of the Drive knob’s range of travel, we’ve added a frequency-shaped front end boost to tighten the low end while driving the amp further into saturation.
Based on* a Marshall® Plexi (Super Lead model number 1959)
This powerful amp is meatier, with higher gain than the other two amps, and has a powerful midrange response. This amp features a buttery, smooth overdrive. At higher Drive settings it will deliver all the high gain distortion and growl this amp is known for, and then some. Setting the Drive control at around 2 o’clock gets you the maximum gain the original Plexi design allowed. Beyond that, our model has some additional gain on tap, giving you access to custom hot-rodded Plexi high gain tones.
Our Matrix Modeling™ process captures all the subtleties and unique character of each amplifier. From the unique composition of each tone stack, to component values, bias levels, corner frequencies, and tube stage gain; all of these factors affect the way a note or chord reacts and evolves over time, and all have been mathematically modeled with the highest fidelity. We included multi-stage power sag, so that the sag response and time constant for each stage of the amplifier is modeled separately, adding further harmonic complexity and realistic feel.
We also modeled the compression, limited cone movement, and speaker distortion that can happen at high signal levels. We carefully set the range and taper for each knob to make it easy to dial in a variety of great tones with intuitive, predictable amp-like responsiveness. Combining the meticulous reproduction of original circuits with careful fine-tuning has resulted in three stellar amp models that deliver the response, feel, and inspiring experience of playing through the original amps at their best.
Tone Stacks That Hit All The Sweet Spots
Aggressively boost the treble, and Iridium beautifully reveals all the subtle nuances of even the softest fingerstyle playing. Crank the bass, and enjoy resonant low end that will make you swear there’s an amp in the room even when monitoring through headphones. True to the tone stacks of the classic amps we modeled, Iridium’s tone controls have the same interdependences as found in the original circuit designs. Iridium gives you amp EQ that is a joy to use, yielding a wide variety of great tones in any direction you go.
More Audio Examples
In this video, the people who work at Strymon get out their instruments and play through Iridium! From customer support, to marketing, to engineering, this video features Strymon employees playing through Iridium by itself as well as in combination with other pedals.
Nine Stunningly Realistic Cabs.
Iridium comes pre-loaded with a carefully curated collection of premium cabinet IRs from OwnHammer, Celestion, cabIR and Valhallir. You can also load your own IRs using Strymon Impulse Manager software.
Deluxe Reverb® 1×12″ by OwnHammer
Impulse of a vintage Fender® Deluxe Reverb 1×12″ open back combo with a 1978 Fender CTS ceramic 12″ speaker.
Blues Junior® 1×12″ by cabIR
Impulse of a 1×12″ Blues Junior cabinet with a Jensen® C12N speaker.
Vibrolux® 2×10″ by cabIR
Impulse of a 1965 Fender Vibrolux 2×10″ with Jensen C10NS speakers.
AC30 2×12″ AlNiCo by OwnHammer
Impulse of a Vox® AC30/6 open back 2×12″ combo with 2001 Celestion® T0530 Blue AlNiCo speakers.
1×12″ AlNiCo by Celestion
Impulse of a Celestion Blue AlNiCo speaker in a closed back 1×12″ cab.
Mesa® 4×12″ by Valhallir
Impulse of a 4×12″ Mesa Boogie halfback with two Celestion Black Shadow® MC-90 and two ElectroVoice® Black Shadow EVM12-L speakers.
GNR 4×12″ by OwnHammer
Impulse of a 1971 Marshall® 1960B “basketweave” 4×12″ cabinet with 1971 Celestion T1221 G12M-25 speakers.
2×12″ Vintage 30 by Celestion
Impulse of a Celestion Vintage 30 in an open back 2×12″ cab.
Marshall 8×12″ AlNiCo by cabIR
Impulse of a 1965 Marshall 8×12″ re-issue full stack cabinet, with Celestion T652 AlNiCo speakers.
Unprecedented IR Technology.
Impulse responses allow the sound and character of a mic’d speaker cabinet to be captured, so that any audio signal can be processed by the resulting impulse response and sound as if it’s being played through that exact speaker cabinet. Iridium is able to deliver impulse response resolution far greater than any other piece of outboard gear.
With full 24bit 96kHz resolution for the entire 500 milliseconds of its speaker cabinet impulse responses, Iridium is able to use the absolute highest quality IRs available. This means countless details are accurately preserved and reproduced to give you a completely real speaker response. Every cabinet resonance, speaker vibration, as well as reflections between the cabinet, the mic, the floor, and the ceiling; all the minuscule cues that tell our brain we are listening to our favorite cabinet are preserved, providing completely lifelike realism.
Load Your Own Impulses.
It’s easy to replace the pre-installed IRs with custom IRs from your own collection by using Strymon Impulse Manager software. To download the software or learn more, visit strymon.net/support/iridium.
-Drive adjusts the amount of gain applied to the incoming signal. The character and response of the Drive setting is different for each amp type.
–Amp – Selects one of three different amp types. The amp selection will alter the response of the Drive, Bass, Middle, and Treble knobs.
–Cab – Selects one of three complimentary cabs for each amp type. Each cab contains two IRs (left and right). IRs can be replaced using Strymon Impulse Manager software.
–Level controls the output volume when the pedal is on. Applies to left and right outputs as well as
the headphone output. Secondary function provides Level Trim function, temporarily scaling the output level for headphone use.
–Bass adjusts the tone stack of the selected amp type to highlight the low frequencies.
–Middle adjusts the tone stack of the Round and Punch amp types to highlight the middle frequencies. Rolls off high frequencies as the knob is turned up for the Chime amp type.
–Treble adjusts the tone stack of the selected amp type to highlight the high frequencies.
–Room controls the level of natural room ambience. Secondary function allows toggling between three room sizes (small, medium, large).
–FAV recalls a stored Favorite setting. Includes all knob and switch settings. Press and hold until the FAV LED blinks to save a new Favorite preset.
–ON activates amp, cab, and room processing. RED LED indicates that the pedal is engaged.
–In – Plug your instrument in here. Instrument (default) or Line level input. TRS adapter cable required for stereo use.
–Out L – Left audio output. Use OUT L for mono output.
–Out R – Right audio output.
–EXP – Multifunction communication jack for external control of Iridium’s features and functions. Use a standard TRS expression pedal to act as a volume pedal before the amp. Can also be used to connect a Strymon
MiniSwitch, MultiSwitch Plus, or MIDI EXP cable for remote preset selection and MIDI automation.
–Power – Use the included power supply or an adapter with the following rating: 9VDC center negative, 500mA minimum.
–Audio Input Selector – Selects input/output configuration modes.
MONO : Use with a mono input signal such as a guitar.
Output is stereo.
STEREO : Use with a stereo input signal. Output is stereo.
SUM : For a stereo input that is summed to MONO and sent
out the OUT L jack.
–USB – Used to load IR files via computer.
Headphone Output – Stereo 1/8 inch headphone output. LEVEL knob adjusts volume.
In the Studio
Iridium provides gorgeous, iconic amp tones, stunningly realistic stereo cabinet impulse responses, and natural room ambience—essential elements for recording guitar in the studio.
Place Iridium at the end of your effects chain and capture stereo amp and cab tones direct into your recording interface. Or, place Iridium before your delays and reverbs to allow those time-based effects to occur post amp and cab.
Skip the hassle of miking up your amps or having to crank them up to get the tone you desire. Instantly audition amps and cabs with the flick of a switch.
You can’t always crank up an amplifier when you want to play in your living room or rehearse at home. Plug your favorite set of headphones into Iridium’s headphone jack and get immersed in the sounds of iconic amps and cabs in a natural sounding room.
Integrate Iridium into your pedalboard by placing at the end of your chain and experience your entire pedalboard tones directly in your headphones.
More Use Cases
Iridium also allows for less common use cases. Want to use Iridium’s amplifiers but not the IR cabinets? Select Iridium’s Cab Bypass mode, and connect the output(s) to the effects return or power amp input on a guitar amplifier.
Want to use Iridium’s IR cabinets but not the amps? Engage Iridium’s Amp Bypass mode, and connect a preamp or preamp pedal (such as Riverside) to Iridium’s input.
Because the purpose of Iridium is to generate amp and cabinet tones, the primary use case is for direct situations. It’s not recommended to connect Iridium to a guitar amplifier.
Amp Research & Development
Delivering the complete experience of playing into an amp through a miked cab in a room is a research and development project that has been years in the making. The amp development began in the tube emulation and cascading gain stage topography created for Riverside, and then majorly leveled up for the intense degree of real-time calculation Matrix Modeling™ required to create Iridium’s amps. We’re not just talking about the perfectly recreated tone stacks, but also things like the treble bleed on the gain controls, multi-stage power supply sag, and preamp and power amp tube emulation.
Our talented and tireless engineering team covered quite a bit of new ground on the way to recreating these classic amp designs with exact mathematical fidelity, and then expanded the capabilities of each amp in musically useful ways, giving you the full range of original amp sounds, and then some.
Impulse Response Technology
We knew it was theoretically possible to deliver our goal of 24bit 96kHz 500ms impulse responses, but we had to figure out how to do it in practice. This part of the Iridium project turned out to be a five-year journey through adversity.
We started with a smaller proof-of-concept FFT (fast Fourier transform) based IR convolution with shorter-duration mono cab IRs, kept working on it, and eventually tore it all down and rebuilt so we could deliver the 24bit 96kHz 500ms IR cabs that we’d dreamed of for Iridium.
Hybrid Room Ambience Design
With these amazing amps and cabs, we wanted to create amazing spaces for them to live and breathe in. When you are playing in a physical room, the first 80 milliseconds or so of early reflections are what really tell your brain what type of space you’re in. The complexity of those myriad early reflections are very difficult to simulate with an algorithm. That’s where impulse response technology is the perfect tool for the task. After a certain duration, however, impulse responses become computationally expensive, and that’s where the algorithm shines: on the long tail.
The algorithmic portions of our room ambience were dialed in for each room, with delay lines tailored to enhance and meld with each specific space and room size. Creating a seamless transition between IR and algorithm was an intensive and artistic process that ultimately resulted in completely natural sounding rooms that feel great to play in and never distract.
SHARC and ARM Co-Processors
Iridium makes the most of the powerful combination of a high-performance 32-bit floating-point SHARC ADSP-21375 processor working together with an ARM co-processor. The SHARC is the perfect choice for handling the plethora of FFT instructions Iridium’s real-time sound processing requires, including adding and subtracting simultaneously.
We’ve created an optimized high-speed communications link between the two processors, and have maximized what the ARM co-processor can do. Each turn of any of Iridium’s knobs sets off a chain of numerous coefficient calculations which we let the ARM co-processor handle, leaving the SHARC free to do its massive computational number crunching full-time at maximum capacity. Besides stellar sound and responsiveness, this combination delivers super fast patch switching. The ARM also provides USB connectivity and allows you to very quickly load and audition impulses with our Impulse Manager software. Iridium is really a new class of device. You get IR resolution never before available in outboard gear, without paying a price in patch switching time, allowing you to select presets seamlessly with the speed you expect for live performance use.
Iridium, like all of our effects pedals, is built right here in Los Angeles, California. There are many advantages to building our pedals within minutes of our design shop. Most importantly, we control every aspect of manufacturing to ensure quality and consistency at every step of the process. Every potentiometer, encoder, switch, LED, and audio component on every pedal is tested and re-tested. Using the latest Audio Precision audio analyzing gear, each pedal must exceed our exacting audio quality standards.
- Three amplifier models crafted using Matrix Modeling™, capturing the subtleties and unique tonal qualities of each amp
- Round Amp – based on* a Fender® Deluxe Reverb®
- Chime Amp – based on* the Brilliant channel of a Vox® AC30
- Punch Amp – based on* a Marshall® Plexi (Super Lead model number 1959)
- Nine Impulse Response speaker cabinets, 24bit / 96kHz 500ms
Stereo (three per amp type), pre-loaded with a curated set of IRs:
- Deluxe Reverb 1×12″ by OwnHammer
- Blues Junior® 1×12″ by CabIR
- Vibrolux® 2×10″ by CabIR
- AC30 2×12″AlNiCo by OwnHammer
- 1×12″ AlNiCo by Celestion®
- Mesa® 4×12″ by Valhallir
- GNR 4×12″ by OwnHammer
- 2×12″ Vintage 30 by Celestion
- Marshall® 8×12″AlNiCo by CabIR
- Load your own impulse responses using Strymon Impulse Manager software
- Hybrid IR/algorithmic Room control with selectable small, medium, and
- Simple, responsive amp-style controls for Drive, Level, Bass, Middle,
- Premium stereo high impedance discrete JFET analog front end with
up to 22dB of pure analog gain
Ins, Outs and Switches
- Stereo Input (requires TRS adapter cable)
- Stereo Output
- Operates at instrument and Line Level input sources
- Discrete transistor headphone amplifier
- Expression pedal input provides seamless morphing between knob positions (Expression mode), or smooth pre/post volume control with logarithmic taper (Volume mode)
- USB jack for connecting to Strymon Impulse Manager software
to add and edit your own speaker cabinet IRs
- Compatible with Strymon MultiSwitch Plus for remote selection of up to 4 presets
- Full featured MIDI control accessible via EXP Jack for remote parameter control and access to 300 preset locations (requires Strymon MIDI EXP cable or MIDI to TRS interface)
- Ultra-low noise, high performance 24-bit 96kHz A/D and D/A
converters provide uncompromising audio quality
- Super high performance SHARC and ARM co-processors
- 32-bit floating point processing
- Transparent Analog Buffered Bypass
- Strong and lightweight anodized black aluminum chassis
- 9V DC power supply included
- Power requirements: maximum 9 volts DC center-negative, with a minimum of 500mA of current
- 4.5″ deep x 4″ wide x 1.75″ tall
- 11.4 cm deep x 10.2 cm wide x 4.4 cm tall
- Designed and built in the USA