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®
True to the Music™
Reamp HP
COMPACT STUDIO REAMPER
User Guide
Radial Engineering Ltd.
1165-1845 Kingsway Ave, Port Coquitlam
British Columbia, Canada, V3C 1S9
Tel: 604-942-1001 • www.radialeng.com
Email: info@radialeng.com
www.radialeng.com
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Radial® Reamp HP User Guide
Table of Contents Page
Overview.......................................................................................1
Features .......................................................................................2
Getting Started .............................................................................3
Making Connections ................................................................. 4-6
The Mono Switch ..........................................................................6
The Level Control ..................................................................... 6-7
The Lift Switch ..............................................................................7
Specications ...............................................................................8
Warranty .......................................................................Back cover
Thank you for purchasing the Radial Reamp HP, a compact
studio device designed to make it as easy as possible to add the
power of Reamping into your workow. With the Reamp HP, you
can connect directly to the headphone output on an interface or a
mobile device, and then use this signal to feed your guitar pedals
and ampliers to add a new creative element to your mixes.
We recommend you take a few minutes to read this short
manual before you begin using the Reamp HP, as it covers the
various features of the device and tips for setup and use. Should
you have any questions about the Reamp HP or any other
Radial devices, please visit our website at www.radialeng.com
for additional resources and frequently asked questions.
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True to the Music
OVERVIEW
Reamping is a powerful studio technique that uses a two-step process:
The rst step involves recording your original audio track, and the second
step (which the Reamp HP is built for) is where you send the recorded
audio track back through guitar pedals and ampliers and record the
results. Reamping can be used to try out a guitar DI track through a
variety of ampliers without altering the performance or tiring out the
musician, or it can be used for experimenting with a track by layering
eects pedals or trying new recording techniques.
As Reamping continues to gain in popularity, a growing number of home
studios are employing this technique. However, one problem that arises
in this scenario is that most small-format audio interfaces have a limited
number of line-level outputs available to feed signal to a Reamp device.
These outputs are usually already connected to a pair of studio monitors
and outboard analog eects, meaning that in order to free up an output
for Reamping, it might be necessary to power down some gear and repatch cables at the back of the interface.
The Reamp HP was created to streamline this process by tapping the
audio signal from a headphone output jack for Reamping, as this output
is found on the front panel of most interfaces and is easily accessible
when the inspiration to Reamp strikes. This simple but eective design
makes it easy to get started with Reamping in any studio using just a few
quick steps.
Using the Reamp HP in 3 steps
Connect the headphone output from your interface to the Reamp HP
Feed the output of the Reamp HP into your pedalboard and amplier
Record the output of your amp back into your audio interface
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Reamp HP™
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FEATURES
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True to the Music
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2 3 4 5 6
1. INPUT: 1/4” TRS stereo input jack accepts signals from the
headphone output on an audio interface to use for Reamping.
2. MONO: Sums the left and right input channels together. When
disengaged, only the right channel is used to feed the output of the
Reamp HP.
3. MINI IN: 3.5mm input jack for easy connection to the outputs of
smartphones, tablets, and laptops.
4. LEVEL: Controls the output signal level from the Reamp HP for
optimal gain-staging through ampliers and pedals.
5. LIFT: Disconnects pin-1 at the input connectors to remove buzz
and hum caused by ground loops.
6. OUTPUT: 1/4” TS mono Reamp output used to feed guitar amps
and eects pedals.
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True to the Music
GETTING STARTED
The Reamp HP is completely passive, meaning it doesn’t require any
power to operate. As soon as you’ve made your connections it will be
ready for use.
The output of the Reamp HP uses a standard ¼” TS instrument cable
to connect a mono signal to your guitar eects pedals and amplier.
We recommend keeping your cable lengths under 15ft to minimize the
possibility of noise and interference on your audio signal.
The inputs of the Reamp HP use ¼” TRS or 3.5mm (1/8”) TRS cables.
These cables have an extra conductor that allows them to transmit both
the left and right channels from a headphone output jack to the Reamp
HP.
Tip
Sleeve
¼” TS
Connects to the
Reamp HP output
¼” TRS 3.5mm TRS
Tip
Ring
Sleeve
Connects to the
Reamp HP inputs
Connecting to the Reamp HP Inputs
The Reamp HP is designed to connect directly to the headphone output
jack on your audio interface. This allows you to get started as quickly
and easily as possible, without having to unplug any cables at the back
of your interface.
Use a TRS cable as shown above to connect the 1/4” INPUT or the
3.5mm MINI IN from the Reamp HP to your source device. You can use
either of these inputs and get the exact same results, as both of these
connector types are provided in order to make it easy to connect to the
Reamp HP without the need for adaptor cables. Keep in mind that you
should only send signal to one of the Reamp HP inputs at any given time.
In general, you’ll nd that most audio interfaces will have ¼” headphone
outputs, while laptops and other playback devices like smartphones and
tablets will be equipped with 3.5mm headphone jacks.
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Connecting the Reamp HP to your audio interface
It’s more common to use a recording interface for Reamping, as this will
allow you to select any audio track in your digital audio workstation (DAW)
and send it through the Reamp HP, while simultaneously recording the
results through your amplier.
Connecting the Reamp HP to a mobile playback device
(Microphone connected to an audio interface not shown)
The 3.5mm INPUT allows you to easily connect a mobile playback device
like a smartphone or a tablet to the Reamp HP. This makes it easy to
audition new ideas on the y, or even take the output of your favorite
music making app and feed it through your amp for to create a unique
eect.
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The Mono switch
The MONO switch, located between the input
connectors, allows you to select whether the
Reamp HP accepts a stereo or a mono input
signal.
The Mono switch
When this switch is pressed in, the Reamp HP accepts a stereo
(left-right) input and sums both channels together equally to feed the
¼” OUTPUT for Reamping. When the MONO switch is left in the out
position, the Reamp HP will ignore the left channel of your source device
and only allow the right channel to pass through the Reamping circuit.
As a general rule of thumb, if you are sending a stereo audio track to the
Reamp HP you should set the MONO switch to the in position. If you are
sending a mono audio signal (like a guitar DI track) to the Reamp HP,
leave the MONO switch set to the out position. Then in your recording
software pan the source track all the way to the right, or assign it to the
right output of your audio interface. An easy way to remember this rule
is to send mono audio tracks to the Right output channel for Reamping.
Connecting to your pedals and amplier
The OUTPUT jack provides an instrumentlevel, high-impedance, unbalanced signal
that is optimized for connection to guitar
pedals and ampliers. Use a standard 1/4” TS
instrument cable to connect this output to your
The 1/4” TS Output
guitar amplier.
You can also insert eects pedals into the signal chain in between the
Reamp HP and your amplier to give you more ways to experiment with
your audio signal.
To complete the Reamping process you will need to record the resulting
signal from your amplier, so the nal connection required is to place
a microphone on the amp and plug it into the mic input on your audio
interface for recording.
The Level control and gain-staging
The LEVEL control on the Reamp HP sets the
amount of attenuation applied to the signal
before it feeds the OUTPUT for Reamping.
This is useful because the outputs on your
audio interface may be capable of producing
higher signal levels than a pedal or amplier is
The Level control
designed to accept.
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The Level control and gain-staging (continued)
The LEVEL control allows you to reduce the output of the Reamp HP to
prevent clipping or distorting the input of your amplier or your eects
pedals.
The Reamp HP itself is capable of handling very hot input levels, so for
best results you will want to provide as much signal level as you can from
your audio interface. Start by turning up the fader on the track you are
using in your Digital Audio Workstation (DAW) until you have a healthy
signal level just shy of clipping, then check any software associated with
your interface itself to see if you have additional output level controls
available. Finally, turn up the local headphone level control on the
interface itself to approximately 80% of its maximum setting.
Note that the output from a mobile device like a smartphone or tablet will
likely be somewhat lower than the outputs of an audio interface, so you
may need to adjust the LEVEL control and the gain on your amplier to
compensate. Don’t be afraid to turn the LEVEL control all the way up to
the maximum setting if necessary: doing so will not increase the noise
oor of the Reamp HP.
Tip: If you have a mono audio source but still need more signal level
through your amplier, you can assign your source track to both the
left and right outputs of your interface, then set the MONO switch
to the in position. The Reamp HP will sum both copies of this mono
signal together and provide you with 3dB more signal from the
OUTPUT of the Reamp HP.
The Lift switch
The LIFT switch on the Reamp HP helps to
eliminate buzz and hum that is often caused
by ground loops. When this switch is engaged,
it disconnects the audio ground path between
both inputs and the 1/4” OUTPUT jack.
The Lift switch
The Reamp HP is equipped with an isolation transformer that will
eliminate the vast majority of ground loops, but in some cases the LIFT
switch can provide further assistance with this issue.
There is no right or wrong setting for this switch: once you’ve made your
connections to the Reamp HP and your amplier, turn on the amp toggle
this switch and leave it in the position that results in the least amount of
noise coming from the speaker cabinet.
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True to the Music
SPECIFICATIONS*
Audio Circuit Type: ............................................Passive, transformer isolated
Frequency Response: ......................................20Hz to 20kHz (+/-0.5dB)
Dynamic Range: ................................................>96dB
Total Harmonic Distortion: .................................0.0015% @ 1kHz
Input Impedance: ...............................................11.8k Ω
Output Impedance: ............................................1.5k Ω
Equivalent Input Noise: ......................................-105dBu
Noise: ................................................................-125dBu
Maximum Input: .................................................>+20dBu
Features
Level Control, Mono, Ground Lift
Input connections: .............................................1/4” TRS stereo, 3.5mm TRS stereo
Output Connectors: ...........................................1/4” TS
General
Construction: .....................................................16 gauge Steel Chassis & Outer Shell
Finish: ................................................................Durable Powder Coat
Power: ...............................................................Passive, no power required
Conditions: .........................................................For use in dry locations only between 5C and 40C
Warranty: ...........................................................Radial 3-year, transferable
* Subject to change without notice.
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THREE YEAR TRANSFERABLE LIMITED WARRANTY
RADIAL ENGINEERING LTD. (“Radial”) warrants this product to be free from defects in
material and workmanship and will remedy any such defects free of charge according
to the terms of this warranty. Radial will repair or replace (at its option) any defective
component(s) of this product (excluding nish and wear and tear on components under
normal use) for a period of three (3) years from the original date of purchase. In the event
that a particular product is no longer available, Radial reserves the right to replace the
product with a similar product of equal or greater value. In the unlikely event that a defect
is uncovered, please call 604-942-1001 or email service@radialeng.com to obtain an
RA number (Return Authorization number) before the 3 year warranty period expires.
The product must be returned prepaid in the original shipping container (or equivalent)
to Radial or to an authorized Radial repair centre and you must assume the risk of loss
or damage. A copy of the original invoice showing date of purchase and the dealer name
must accompany any request for work to be performed under this limited and transferable
warranty. This warranty shall not apply if the product has been damaged due to abuse,
misuse, misapplication, accident or as a result of service or modication by any other than
an authorized Radial repair center.
THERE ARE NO EXPRESSED WARRANTIES OTHER THAN THOSE ON THE FACE
HEREOF AND DESCRIBED ABOVE. NO WARRANTIES WHETHER EXPRESSED
OR IMPLIED, INCLUDING BUT NOT LIMITED TO, ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE SHALL EXTEND
BEYOND THE RESPECTIVE WARRANTY PERIOD DESCRIBED ABOVE OF THREE
YEARS. RADIAL SHALL NOT BE RESPONSIBLE OR LIABLE FOR ANY SPECIAL,
INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSS ARISING FROM THE USE
OF THIS PRODUCT. THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, AND
YOU MAY ALSO HAVE OTHER RIGHTS, WHICH MAY VARY DEPENDING ON WHERE
YOU LIVE AND WHERE THE PRODUCT WAS PURCHASED.
To meet the requirements of California Proposition 65, it is our responsibility to inform you of the following:
WARNING: This product contains chemicals known to the State of California to cause
cancer, birth defects or other reproductive harm.
Please take proper care when handling and consult local government regulations before discarding.
®
www.radialeng.com
Radial Engineering Ltd.
1165-1845 Kingsway Ave, Port Coquitlam, British Columbia, V3C 1S9
Tel: 604-942-1001 • www.radialeng.com • info@radialeng.com
Radial® Reamp HP User Guide - V1.0, 08-2022
Copyright 2022 Radial Engineering Ltd. All rights reserved.
Specications and appearance subject to change without notice.
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