The HO8 is built for larger sessions rather than isolated overdub use only.
Studio Rack
HO8 All Discrete 8-Channel Mic Preamp
An eight-channel all-discrete mic preamp with 24 high-voltage op-amps and a 56V linear power supply, built for drums, orchestra, and other multi-channel sessions that still need low noise and high gain.
8 Channels
24 High-Voltage Op-Amps
56V Linear PSU
75 dB Gain
Drum Recording
Why It Matters
Four things that define the HO8
The unit centers on 24 independent high-voltage op-amps.
Its power supply is part of the core product story, not a hidden implementation detail.
The HO8 is built for high gain while maintaining ultra-low noise.
Workflow Reference
Think in repeatable multichannel capture, not eight unrelated gain knobs
HO8 earns its place when the session needs many channels of stable, low-noise, high-gain capture without turning setup into chaos.
- Eight Channels As A System Approach the front panel as a coherent tracking rig rather than eight disconnected choices.
- High Gain, Low Noise Its value is not only channel count but also how much gain is available before the recording turns messy.
- Session Repeatability On drums, orchestra, and larger sessions, good notes are part of using the preamp well.
Quick Start
How to start with HO8 on a real tracking day
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1
Decide the channel plan before soundcheck so you are not inventing routing while musicians wait.
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2
Set the loudest source first and build the rest of the gain map around that headroom reality.
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3
Use phantom only on the channels that need it and stay deliberate around any ribbon microphones.
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4
If the channels feel inconsistent, compare source level, microphone choice, and placement before assuming the preamp channels are misbehaving.
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5
Document the channel assignment and gain map once the session is working; that pays off on revisions and overdubs.
Start simple, listen in context, and save only the settings you would actually want to recall.
Working Uses
Where owners usually notice HO8’s value first
One of the clearest use cases because the channel count fits a practical drum layout immediately.
Useful when many microphones need stable gain and low noise at the same time.
It also fits everyday multi-source studio work, not only larger sessions.
A strong choice when the goal is a reliable multi-channel front end for recurring sessions.
Working Notes
Notes that make a multichannel preamp feel like one tool instead of eight
A simple map of sources to channels becomes surprisingly valuable once edits, overdubs, or troubleshooting begin.
Let the loudest source set the gain logic before you build the entire session around quieter channels.
On a multichannel front end, phantom mistakes become easier simply because there are more places to forget what is connected where.
The point is not just eight channels. The point is eight channels that behave like one coherent front end.
Once drum or ensemble sessions repeat, channel assignments and rough gain ranges become real studio assets.
If one channel feels off, compare mic, player, placement, and room before blaming the preamp.
Specs
Key Specs
Gain Range (Mic Input)
10 - 75dB
Z&H Trim Range
-5 to +5dB
Gain Range (Hi-Z Input)
N/A
Maximum Output Level
+26.5 dBu (100k Ohm load, 0.1% THD)
VU / LED Thresholds
Green: -14dBu · Red: +24dBu
THD+N
@20dB gain: <0.005 · @40dB gain: <0.008 · @60dB gain: <0.048
IMD
<0.021
Equivalent Input Noise
< -95dB for both 200KΩ and 600Ω sources
CMRR
41.4dB at 400Hz, 1kHz, 10kHz
Phase Deviation (HPF off)
>4 degrees from 50Hz to 25kHz
Frequency Response
-3dB: 4.5Hz - 390kHz · -0.5dB: 10.5Hz - 140kHz (Mic Input @ 40dB Gain)
Impedance
Mic input 1.7kΩ · Ribbon mode 1.2kΩ · Output balanced 600Ω / unbalanced 400Ω
Unit Dimensions
9cm x 44cm x 30cm
Unit Weight
6kg / 13.23 LB
Power Consumption
100V - 240 V AC, 50 Watts Max
Owner FAQ
Questions that usually come up once you track a full session through it
Session Planning Do I really need to map the channels before recording?
Yes. On an eight-channel preamp, planning the channel layout first saves time and makes later troubleshooting much faster.
A channel map is not admin work here; it is part of getting through the session cleanly.
Gain How do I keep one loud source from forcing every other channel into awkward gain positions?
Set the loudest source first, then work outward. Headroom planning matters more here than with a small preamp.
Build the gain map around reality, not around the channel order you happen to like.
Noise Why is ultra-low noise such a big part of the product story?
Because the value of an eight-channel front end depends on high gain remaining usable across many microphones at once.
One noisy channel can spoil the benefit of a multichannel tracking rig very quickly.
Phantom Should all channels share the same phantom-power habit?
No. Enable it only where required. Treat each channel according to the microphone on that input.
Multichannel convenience should not turn phantom into a blanket setting.
Use Case Is HO8 only for large orchestra sessions?
No. It is also practical for everyday multi-mic sessions involving piano, guitar, and vocals.
The bigger point is repeatable multi-mic front-end quality, not only big-budget scale.
Drums Why does HO8 make so much sense on drums specifically?
Because the channel count naturally covers a practical drum layout and keeps the front end coherent.
That practical fit is part of why it reads less like eight random preamps and more like one tracking tool.
Recall What should I always capture in HO8 session notes?
Source-to-channel map, rough gain ranges, phantom usage, and any channel pairings or subgroup logic. Those notes save real time once sessions repeat.
The more channels involved, the more valuable that map becomes.
Downloads & Resources
Keep the key files and working tools in one place
Use the shared Setup Sheets library for now.
WIP: Dedicated setup sheet pending.
Open LibraryOpen the shorter operating guide when you need a fast setup reference without the full manual.
Open PDFUse this page for first-session workflow, quick specs, and owner FAQ while the session is live.
Open the downloadable manual when you need a formal control reference or an offline copy outside the guide.
Open PDFUse the support page when the issue moves beyond normal workflow and starts looking like routing, power, noise, current draw, phantom, or service.
Open SupportService
What to have ready before you reach out
Channel Map
Send support the exact source-to-channel assignment if the problem appears only on certain inputs.
Mic And Phantom Context
Note the microphone type and phantom state for the affected channels.
Session Context
Mention whether the issue appeared on drums, ensemble work, piano, or another multi-mic setup.