Crown IC-150A (1976–1977)
The IC-150A weighs 9.1 kg and its frequency response runs out to 100 kHz. It doesn't shout. You mostly notice how little it gets in the way.
Overview
The Crown IC-150A isn't the amplifier most collectors expect from Crown. , the IC-150A took a different path: precision, transparency, and tight control. Crown built it in limited numbers between 1976 and 1977. It was a solid-state stereo preamplifier for high-end audiophiles and system integrators who wanted ultra-low distortion and flexible signal routing. It cost $399 at launch, which was no small sum back then. It sat in a niche, and the goal was a system that disappears sonically.
Built as a control amplifier with extensive input options and a unique panorama system, it allowed users to manipulate stereo image placement in ways few preamps of the era could match.
The IC-150A has a low profile in mainstream vintage circles, but people who've used it respect it. It wasn't widely advertised or mass-produced. Crown's no-nonsense design philosophy stands behind it. Today it turns up occasionally in forums and auctions, often paired with its companion power amp, the D-150A, as a complete high-fidelity chain that still holds up.
Specifications
| Manufacturer | Crown International |
| Model | IC-150A |
| Type | Control amplifier / Preamplifier |
| Production years | 1976–1977 |
| Original price | $399 |
| Frequency response, High level | 3 Hz to 100 kHz ±0.6 dB |
| Frequency response, Phono | 10 Hz to 20 kHz ±0.1 dB |
| Input sensitivity/impedance, High level | 100k Ω |
| Input sensitivity/impedance, Phono | 0.75 mV (max) / 47k Ω |
| Gain, High level | 20.8 dB |
| Gain, Phono | 30 dB to 50 dB |
| Tone control, Bass | ±15 dB at 30 Hz |
| Tone control, Treble | ±15 dB at 15 kHz |
| Signal-to-noise ratio, High level | 95 dB |
| Signal-to-noise ratio, Phono | 85 dB |
| Total harmonic distortion | 0.05% or less (20 Hz – 20 kHz) |
| Filter, Low | 24 Hz, 6 dB/octave |
| Filter, High | 5 kHz, 12 dB/octave |
| Power requirements | 100 VAC, 50/60 Hz |
| Power consumption | 2 W |
| Dimensions (W x H x D) | 432 x 133 x 206 mm |
| Weight | 9.1 kg |
Key Features
Panorama Balance Control with Image Placement
Unlike a standard balance knob that merely shifts volume between channels, this system allowed continuous adjustment from normal stereo to mono, reverse stereo (left and right swapped), and everything in between. More than a gimmick, it gave users precise control over soundstage geometry—useful for optimizing speaker placement or compensating for asymmetrical room layouts. andEight Input Systems with Adjustable Phono Gain
The IC-150A has eight input options for a wide range of sources. Two dedicated phono inputs take magnetic cartridges, with gain adjustable between 30 and 50 dB. That lets you match different cartridge outputs without overdriving the stage. The remaining inputs are tuner, auxiliary, and tape loops. Input impedance for high-level sources is a high 100k Ω, which keeps loading on upstream gear low.
Extended Frequency Response and Ultra-Low Distortion
High-level response runs from 3 Hz to 100 kHz within ±0.6 dB, well beyond the audible range. Total harmonic distortion is rated at 0.05% or less across 20 Hz to 20 kHz. The phono stage is optimized for RIAA compliance and holds ±0.5 dB of RIAA accuracy.
Dedicated Tone and Filter Controls
The tone controls are wide: ±15 dB at 30 Hz for bass and ±15 dB at 15 kHz for treble. These aren't subtle trimmers. They allow dramatic shaping when needed. There are also switchable filters: a 6 dB/octave high-pass at 24 Hz to cut subsonic rumble, and a 12 dB/octave low-pass at 5 kHz to reduce high-frequency noise. They help with older recordings or tapes with surface noise or hum. Together the filtering and tone adjustment let the preamp handle a wide range of source material and listening rooms.
Collectibility & Value
The IC-150A has no broad market presence, but demand exists among Crown enthusiasts and vintage audio purists. A serviced unit paired with the D-150A power amp once carried an asking price of $1,150, which suggests strong value for fully restored examples. Untested or uncleaned units typically sell for far less, reflecting the risks of age-related wear.
Common operational issues include speaker "womping" or oscillation, often traced to system interaction rather than the preamp itself. High noise or hum has been reported, though sources suggest this can sometimes come from downstream equipment, such as a power amp with the volume controls turned up too high when no signal is present. Maintenance typically means a full service: cleaning the switches, potentiometers, and jacks, and inspecting the internal connections. With its solid-state design and high-quality internal components, the IC-150A is generally reliable if kept clean and powered with stable voltage.
Market Value
┌──────────────────────────────────────────────────────────────────────────┐ │ CROWN IC-150A Nov 2026 │ ├──────────────────────────────────────────────────────────────────────────┤ │ High $700 Latest $370 │ │ Median $453 Trend — │ │ Low $290 Volume ~2/mo │ ├──────────────────────────────────────────────────────────────────────────┤ │ $700 ┤ │ │ │. . │ │ │ │ │ $486 ┤ . │ │ │ . │ │ │ .│ │ │ . . │ │ $200 ┤ │ │ ├─────────────────────────────────────────────────────────────────│ │ vol │█ █ █ █ █ █ █│ │ └─────────────────────────────────────────────────────────────────│ │ 2026-04 2026-06 2026-08│ └──────────────────────────────────────────────────────────────────────────┘
eBay completed sales. Excludes accessories, parts, and non-working units. Hover points for details.
eBay Listings
Recently sold on eBay: $316–$660 (median $453, based on 7 completed sales, past 12 months)
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Related Models
- Crown C-4 (1965)
- Crown D-150
- Crown D-150A IOC
- Crown D-150A (1975)
- Crown D-60 (1972)
- Eico 3150 (1967)
- Fisher CUSTOM-ELECTRA-I (K-14/K-15) (1957)
- Fisher CUSTOM-ELECTRA IV (E33/E44) (1960)
- Akai AM-2400 (1978)
- Akai AM-2600 (1977)