There are IR files for each mic position, so when you change the mic position, you load a different file. DSRs incorporate dynamic mic positioning, simply move the mic position within the SpeakerMix Pro interface – no need to load a different file!

Yes you can use them both together in SpeakerMix Pro, they’ll be integrated seamlessly.

No. DSRs are a proprietary Celestion format only for use with the SpeakerMix Pro plug-in.

Impulse Responses are implemented through a process called “linear convolution”. Speakers behave in a non-linear way, especially when pushed hard: you get compression on some frequencies, harmonics and dissonances as different frequencies interact with each other which contributes to overall tonality. The linear convolution process isn’t able to exactly replicate some of these contributory factors.. They sound great, but the Dynamic Speaker Responses go a step further, incorporating the acoustic effects of the speaker’s non-linear behaviour which results in even greater levels of realism.

Yes. SpeakerMix Pro includes a high-level re-sampler: the “better” the input file, the “better” the result.

You can use .wav files, any sample rate and length.



Sure! An IR can be loaded on each channel with the send controls working pre-fader, i.e. independently from cabinet levels. Engage the Solo button for the room bus and only the room components will be mixed together and will reach the master bus.

Yes, with a max length limit set to one second. It is optimized for rooms, not thought of as a general reverb engine.

Check the mixer channel is not muted, or another channel is in solo. Then, check your input and output fader levels are above -∞. Try activating the Autogain button. This adjusts your output faders automatically to preserve the RMS level through the plugin.

Yes you can use them both together in SpeakerMix Pro, they’ll be integrated seamlessly.

Yes, you don’t need a permanent connection. You simply need to temporarily connect your workstation on installation, and for periodic updates and messages when requested by the software.

Yes you can. Check the SpeakerMix manual to see how to load your Impulse Responses, both for cabinets and for rooms.

An IR is the behaviour of a system (in this case a guitar speaker miked up in a room) when subjected to a brief input signal, captured in a digital format. It is, if you like, a digital “fingerprint” of the tone of a speaker. It captures every resonance and reflection in a way that a basic EQ cannot. More than that, with a Celestion IR you get the bottled essence of the speaker, a state of the art recording studio, equipment, time and expertise all distilled into an Impulse Response file. A file that gives you great tone, quickly and easily, time and time again.

Impulse Responses are combined (convolved) with the sound of your amp to give you the speaker tone that you want. This can be done in a variety of ways, in a Digital Audio Workstation (DAW), modelling hardware, or even a simple pedal.

Watch an introduction to Impulse Responses by Pete Thorn.

Our IR download formats are generic in nature, so should work with the hardware you are using. Some pieces of hardware may need you to convert them into other proprietary formats before loading and use, or they may convert them as you load them. Check your hardware’s instructions for details to see if you can use WAV files directly or if they will need any conversion first.

Please note though that we cannot provide support for your hardware and its file conversion and loading process.

We provide digital downloads in the sample rates 44.1 kHz, 48.0 kHz, 88.2 kHz and 96.0 kHz and in lengths of 200 and 500 ms.

When you go through the purchase process you will see a list of hardware manufacturers. If you are using one of these you can choose from this list and your download will only contain the correct sample rate and/or file length for that hardware. If your hardware is not listed you will need to check the instruction manual for the sample rate required.

You also have the option to choose to download specific sample rates or an entire package of all sample rates and lengths.

Sample Rates

  • All sample rates and lengths
  • 44.1 kHz
  • 48.0 kHz
  • 88.2 kHz
  • 96.0 kHz


  • Atomic
  • Fractal (requires conversion)
  • Kemper (requires conversion)
  • Line 6
  • Logidy
  • Positive Grid
  • Two notes
  • Yamaha (requires conversion)

All our Impulse Response Digital Downloads are in a generic, non-proprietary, native uncompressed WAVE audio (.wav) format. Some hardware may need the files to be converted to a specific format before they can be loaded, while others may carry out the conversion for you when you load them. You’ll need to check the instructions for your particular hardware.

If your order contains multiple .wav files, they will be delivered to you as a single ZIP file.

A ZIP (.ZIP) file is a file that typically contains multiple files and/or folders, losslessly compressed to facilitate easy download. A double click/right-click/drag and drop onto a suitable application  of the downloaded ZIP file will begin the unpacking process and give you various options of how you want it unpacked and where you want the contents to go.

Depending on exactly what download selection you have made, you will then typically find a folder/file structure as below:

The picture above shows how a fully expanded set of files will look.

You can find instructions here. Alternatively you can add products to your basket from the individual product pages, and proceed to checkout.

Once payment has been made, you can download the product files from the ‘My Downloads’ area found within your account area.

If you are using a DAW then you will need a separate plug-in/loader (sometimes referred to as a convolver or convolution plug-in) to load and make use of Impulse Responses.  You can check out Celestion’s SpeakerMix Pro plugin here.

Hardware simulation and profiling devices commonly have the loader already “built in”.



Yes. Download our brilliant free demo mix here.

We accept Visa, MasterCard, Maestro, American Express, and PayPal (which also accepts Discover and Maestro cards).


Downloading files should not take long, but will vary depending on your internet connection, download speed, and how many files are being downloaded.

Each single cabinet product file is approximately 15MB, which based on a slow broadband connection (2Mbit/s) would take around 2-3 seconds to download. So, with a slow connection, a full package would take approximately 10-12 seconds in total.

You can log back in to your account and restart the download from within ‘My Downloads’.

You can login to your account and check this from the ‘My Downloads’ area.

There is no time limit and you can download your files up to 5 times.

No. Maybe one day though.

We decided to start with a cross section of some of our most popular models, keep an eye out for more soon!

No. Please see our End User Licence Agreements for details on sharing the files, simultaneous use of the same download and more.  Please note downloads are tagged with unique Identifiers so we can track them back to the original purchase.

Please login to your account and select ‘Account Details’ from the Dashboard. You can edit your information there.

Please login to your account and select ‘Account Details’ from the Dashboard. You can change your password there.

You can request a new password from the login screen. You will then be able to reset this using your email address.

Start by double-checking you have entered the correct information.  If this does not work, you can reset your password from the login screen.  If this does not work, contact us here.

If you can’t find the answer you need in the FAQs, click here to email us.

High gain guitar amps sound very bright without a speaker or Impulse Response to filter a lot of the high frequencies. If you don’t have the IR enabled properly, or it’s in the wrong place in the signal chain, it’s easy to get a bad sound fast.

Firstly check your convolution plugin is switched on and your IR of choice is selected.

Secondly, make sure 100% of your guitar sound is going through the IR. Sometimes the plugin will have a mix dial, set this to 100%. If you’re using a reverb convolution plugin, set it to 100% wet.

Lastly, the IR must be in the right place in the signal chain; make sure it’s after your amp. If you’ve ever rolled your tone control back with a high gain sound and wondered why it doesn’t get any darker – that’s exactly what you’re doing having the IR before the amp simulation.

After these quick few checks you should be good to go!