Colossal, timbre-twisting passive equalization using metal-film resistors, film capacitors, and hand-wound inductors to organically sculpt the tone from subtle to vivid. Manley’s tube stages handle huge HF boosts without sibilance and unbelievable fatness without mud. “It’s like a Pultec on steroids.”
Each band can be bypassed or set to boost or cut. This provides twice the control resolution over conventional EQs. It also eliminates the problem of a center detent not guaranteeing flat response.
Each band is capable of 20 dB of boost or cut combined with amazing headroom and freedom from clipping.
Steep LP and HP filters for maximum effectiveness and achieved passively for minimal coloration. Low Pass Filters get progressively steeper as the frequency point rises. All of the High Pass Filters, and the Low Pass 6K, 7K5, and 9KHz Filter slopes are 18 dB/octave, the Low Pass 12kHz filter has a 24dB/octave slope and the 18kHz filter has a 60 dB per octave slope.
Transformer balanced floating outputs for ease of installation and a touch of desirable flavor. These too were custom designed for the Massive Passive to accommodate the huge boosts possible.
All-Passive tone sculpting circuitry
Unique Shelf curves use the "bandwidth" control
Overlapping and Interleaved Frequency choices
Every band switchable to shelf or bell
Vacuum tube make-up gain and line drivers
Parallel symmetrical topology
Premium components throughout
Passive HP and LP Filters plus gain trims
Inputs: Balanced XLR & 1/4” (accepts unbalanced)
Outputs: Balanced XLR (accepts unbalanced) & Unbalanced 1/4”
Level +4 dBu nominal
Bypass Switch bypasses EQ & tube circuits: 1/4” Jacks (not hardwire)
Bypass Switch bypasses EQ, tube circuits & Input Buffer: XLR Jacks (Hardwire Bypass)
Gain Trim: -6dB - 0dB - +4dB
44 Frequencies (roughly 1/4 octave spacing)
Frequency Range: 22 Hz to 27 kHz
EQ Boost/Cut Range : Maximum 20 dB boost or cut
Nominal Q range: 1.5 to 3 (uniquely active in shelf modes)
Maximum Input Level: +21dBu
Maximum Output Level (1kHz sine, 1% THD+N, BW 22Hz-22kHz, Load 100kOhms): +35dBu
Frequency Response (@ +4dBu, Load 100kOhms): -0.1 dB @ 10Hz, -1 dB @ 60 kHz
Total Harmonic Distortion (THD+N) (1kHz sine @ +4dBu, BW 22Hz-22kHz): 0.006%
Output Headroom (Reference to +4dBu): 31dB
Dynamic Range (Reference to Maximum Output): 123 dB
Noise Floor Typical (Unity Gain): -88 dBu (A-Weighted)
Signal to Noise Ratio (Reference to +4 dBu, BW 22Hz-22kHz): 92dB
Input Impedance: 20kOhm
Output Impedance: 150 Ohm
Tube Complement: 2 x 5751, 4 x 6922
Auto-mute warmup delay = 20 seconds
Power Consumption (120/240VAC): 44 watts
Mains Voltage & Frequency (VAC/Hz): Internal Universal Power Supply 90-254 VAC / 50-60Hz
Size (3U): L 19” x W 10” x H 5.25”
US and EU parcels ship via UPS, ETA 1-7 working days from pickup day zero. That also applies to most
All shipments are fully insured.
Bigger shipments requiring pallets or custom made crates ship to US, CA, JP, CN, AU and other outside of EU locations via DHL Air Freight, ETA is normally approx. 7-14 working days from pickup day zero.
Big shipments inside EU ship via different freight companies, recently mostly via ACE Logistics. Freight forwarders can use different courier companies for deliveries to final destinations.
Palletising and crating time can vary depending on the size of the shipment and packaging queue. We pack all our shipments with great care.
You are most welcome to pick your order up yourself from our Retrosonic Pro Audio showroom, studio and warehouse in Tallinn, Estonia.
We ship worldwide – contact us for a personal shipping quote or any other questions.
VAT (Value Added Tax) can be deducted if you have a company with a valid EU VAT number or if you're based outside of the EU. Non-EU buyers pay all and any import tax and duty as regulated by their local customs.