Kazrog Avalon EQ Bundle – Analog Tube EQ Plugins

EQ can make or break a mix. But not all EQs behave the same way when you push them. The Kazrog Avalon EQ Bundle gives you two studio-standard analog equalizer circuits — the Avalon VT-747SP and the AD-2055 — modeled at the component level and running as VST3, AU, and AAX plugins inside your DAW.

The VT-747SP is a six-band tube EQ paired with an opto compressor in a single plugin. The AD-2055 is a five-band parametric EQ with continuously variable Q and musical bandwidth behavior. Together, they handle everything from tracking to mix bus processing. In other words, you get two different analog flavors in one bundle.

How These Plugins Behave Differently From Standard Digital EQs

Most EQ plugins apply a clean digital filter. The Kazrog Avalon EQ Bundle, however, reproduces the actual circuit behavior of the hardware — saturation curves, frequency interaction, and how the impedance shifts when you drive the input. Kazrog mapped every transistor, capacitor, and transformer stage from the original Avalon units. As a result, the plugin reacts like an analog channel strip, not a digital emulation with a retro skin.

The VT-747SP covers a high-pass filter, four bands of shelving and peaking EQ, and an optical compressor stage. The compressor uses an opto cell — the kind that responds to average signal level rather than instantaneous peaks. Consequently, your transients stay intact while the body of the sound tightens up.

Route a vocal, a bass track, or a full mix bus through it. You get the same interaction between EQ and compression that engineers rely on in hardware. That interaction is difficult to replicate with standard digital tools.

The AD-2055 gives you two fully parametric mid bands, a low shelf, a high shelf, and a high-pass filter. What separates it from a standard parametric EQ is the Q behavior — the bandwidth widens naturally as you add gain. A 5 dB lift at 3 kHz, for example, sounds open rather than honky. That is the Avalon characteristic, and the plugin preserves it accurately.

For surgical EQ work, pair these with the FabFilter Total Bundle. For more analog-modeled plugins, browse the VST plugins collection.

What’s Included

The VT-747SP Tube Equalizer

The Avalon VT-747SP has appeared on more commercial records than most EQ plugins combined. Its six-band EQ section includes a high-pass filter, a low shelf, four overlapping peaking bands, and a high shelf. The optical compressor, meanwhile, uses a photocell that responds to average level rather than peaks. As a result, it grabs the body of the sound without killing the attack.

In the Kazrog Avalon EQ VST, the tube saturation comes from modeled 12AX7 and 12AT7 stages. Drive the input and the plugin introduces even-order harmonics that add weight. Back it off and the signal stays clean. The EQ bands also interact with the compressor the same way they do in the hardware — push a frequency band and the compressor reacts accordingly.

On vocals, try this: high-pass at 80 Hz, a 3–5 kHz presence lift, and 2–3 dB of compression. The vocal sits forward without harshness. The same chain works on bass, acoustic guitar, and room mics. In short, the VT-747SP covers a wide range of tracking and mixing duties.

The AD-2055 Parametric Equalizer

The AD-2055 is a five-band parametric EQ with two fully parametric mid bands, a low shelf, a high shelf, and a high-pass filter. What engineers notice first, however, is how the bandwidth interacts with gain — the Q widens naturally as you boost. A 6 dB lift, for instance, doesn’t sound pinched or resonant. It stays smooth and musical.

Try it on your drum bus: 2 dB shelf at 100 Hz for low-end weight, then 2 dB at 5 kHz for snare presence without sibilance. On the master bus, it works as a broad tone shaper. Two or three dB of adjustment across the low and high shelves is often enough to balance an entire mix from top to bottom.

For background on why component-level analog modeling matters, Sound On Sound’s comparison of analog vs. digital EQ design covers the technical differences clearly. Additionally, the KVR Audio forums have detailed threads on Kazrog’s modeling accuracy.

Who This Bundle Works For

If you mix R&B, soul, rock, jazz, pop, or lo-fi, the analog character of these plugins will show up in your tracks immediately. The Kazrog Avalon EQ Bundle gives you the sound of two hardware units that would cost over $5,000 combined — with no maintenance or rack space required. That alone makes it a practical choice for producers working in home studios or professional facilities.

If you already use digital EQs like FabFilter Pro-Q for surgical work, the Avalon plugins sit alongside them as a color EQ. Broad shaping, tonal adjustment, saturation — the two approaches complement each other naturally. After all, having both precision and character in your toolbox gives you more options during a mix.

For electronic and hip-hop producers, the VT-747SP compressor is worth the bundle on its own. The opto behavior tames 808 sustain while keeping the attack intact. Moreover, the tube EQ adds weight that translates to smaller speakers — useful when you are checking your low end on laptop speakers or headphones.

System Requirements

• Formats: VST3, AU, AAX (64-bit only)
• Windows: Windows 7 or later, 64-bit
• macOS: macOS 10.12 or later — native Apple Silicon (M1/M2/M3) support
• DAW support: Ableton Live, Logic Pro, Pro Tools, FL Studio, Cubase, Studio One, Reaper, and any VST3/AU/AAX host
• Sample rates: Up to 192 kHz
• Authorization: License file — no iLok, no dongle
• Delivery: Instant digital download after purchase

Final Thoughts

These two plugins cover more ground than most EQ collections twice their size. If your mix needs analog weight — the kind that comes from real tube saturation, musical EQ curves, and opto compression — the Kazrog Avalon EQ Bundle delivers it without the $5,000 hardware price tag. Furthermore, you avoid the maintenance that comes with keeping vintage units operational.

Add the Kazrog Avalon EQ Bundle to your cart →