# IR-1 asking for 4 files when creating custom IR **URL:** \ **Category:** Support\ **Created:** [February 11, 2024, 8:53pm UTC](https://forum.waves.com/t/ir-1-asking-for-4-files-when-creating-custom-ir/8839 "2024-02-11T20:53:20Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![hzdsnabula](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.waves.com/hzdsnabula/32/1648_2.png) [@hzdsnabula](https://forum.waves.com/u/hzdsnabula)\ **Post date:** [February 11, 2024, 8:53pm UTC](https://forum.waves.com/t/ir-1-asking-for-4-files-when-creating-custom-ir/8839/1 "2024-02-11T20:53:20Z")
Hi there. I’ve made a stereo recording of the sweep in a room. When creating the wir file, IR-1 asks for 4 files. L-L, L-R, R-L, R-R. I only have L and R. So how do I proceed? I’m guessing L-L = L and R-R = R Should L-R be silent or L or R And similarly, should R-L be silent or L or R thx ---
**Author:** ![simon.a.billington](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.waves.com/simon.a.billington/32/158_2.png) [@simon.a.billington](https://forum.waves.com/u/simon.a.billington)\ **Post date:** [February 12, 2024, 3:13am UTC](https://forum.waves.com/t/ir-1-asking-for-4-files-when-creating-custom-ir/8839/2 "2024-02-12T03:13:10Z")
Ah, perhaps it’s not Left Subtract Left (L-L), but essentially a stereo version of a mono file with Left information in both the Left and Right Channel. And the same thing for R-R. While the L-R would be standard stereo configuration and R-L would be to have the channels swap sides. So the Left information now comes out the Right channel and the Right information would come out the Left. I imagine these configurations are for mono instances of the plugin, or even potentially multichannel version assignments. ---
**Author:** ![hzdsnabula](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.waves.com/hzdsnabula/32/1648_2.png) [@hzdsnabula](https://forum.waves.com/u/hzdsnabula)\ **Post date:** [February 12, 2024, 7:57am UTC](https://forum.waves.com/t/ir-1-asking-for-4-files-when-creating-custom-ir/8839/3 "2024-02-12T07:57:36Z")
Ah, 4 stereo files. I’ll give it a shot ---
**Author:** ![hzdsnabula](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.waves.com/hzdsnabula/32/1648_2.png) [@hzdsnabula](https://forum.waves.com/u/hzdsnabula)\ **Post date:** [February 12, 2024, 8:09am UTC](https://forum.waves.com/t/ir-1-asking-for-4-files-when-creating-custom-ir/8839/4 "2024-02-12T08:09:07Z")
Doesn’t appear to be it. IR-1 asks for 4 files. When I feed it the first stereo file (L-L) it then asks for 2 more files. So it seems it need 4 channels. ---
**Author:** ![simon.a.billington](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.waves.com/simon.a.billington/32/158_2.png) [@simon.a.billington](https://forum.waves.com/u/simon.a.billington)\ **Post date:** [February 16, 2024, 11:38am UTC](https://forum.waves.com/t/ir-1-asking-for-4-files-when-creating-custom-ir/8839/5 "2024-02-16T11:38:36Z")
That’s bizarre. I reckon your best bet would be to get onto support, someone at Waves will know. Then when you get a response let the rest of us know!! > **[Contact Us - Waves Audio](https://www.waves.com/contact-us)** > > Whether you're already a Waves product owner or simply have a question, select the most convenient way to reach us, and we'll do our best to help you. ---
**Author:** ![hzdsnabula](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.waves.com/hzdsnabula/32/1648_2.png) [@hzdsnabula](https://forum.waves.com/u/hzdsnabula)\ **Post date:** [February 16, 2024, 1:44pm UTC](https://forum.waves.com/t/ir-1-asking-for-4-files-when-creating-custom-ir/8839/6 "2024-02-16T13:44:15Z")
I’ve sent them a support request. In the mean time, I just tried importing L-L as just left, and L-R as L and R with R phase inverted and so on. Works better. You mentioned “…Left Subtract Left (L-L)…” I didn’t catch that initially, so now I tried this. Anyways, I’ll let you guys know what they reply. ---
**Author:** ![hzdsnabula](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.waves.com/hzdsnabula/32/1648_2.png) [@hzdsnabula](https://forum.waves.com/u/hzdsnabula)\ **Post date:** [February 19, 2024, 1:36pm UTC](https://forum.waves.com/t/ir-1-asking-for-4-files-when-creating-custom-ir/8839/7 "2024-02-19T13:36:33Z")
This from Waves support: If you only have a stereo recording, you can split it into two mono files (L and R) and load them twice or use the **Efficient Stereo** component, which only requires two convolutions (L and R). More information can be found on page 8 of the IR1 Convolution Reverb ---
**Author:** ![simon.a.billington](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.waves.com/simon.a.billington/32/158_2.png) [@simon.a.billington](https://forum.waves.com/u/simon.a.billington)\ **Post date:** [February 22, 2024, 2:51am UTC](https://forum.waves.com/t/ir-1-asking-for-4-files-when-creating-custom-ir/8839/8 "2024-02-22T02:51:11Z")
That helps!! It seems to be absent of more useful information though. If the manual was clear enough you wouldn’t be getting in contact with them. 🤔 Were you able to do anything with this information?? ---
**Author:** ![Rohlfie](https://avatars.discourse-cdn.com/v4/letter/r/b2d939/32.png) [@Rohlfie](https://forum.waves.com/u/Rohlfie)\ **Post date:** [April 12, 2024, 9:19pm UTC](https://forum.waves.com/t/ir-1-asking-for-4-files-when-creating-custom-ir/8839/9 "2024-04-12T21:19:39Z")
I’ll weigh in here, as I just reviewed the process again. If you want to create a full stereo convolution reverb with IR-1, you need to have recorded the left speaker first, followed by the right speaker with a pair of microphones. You can then create individual files that match what is called for by IR-1 when loading your sweep captures. It can help to think of L-L, L-R, R-L, and R-R in terms of SPEAKER-MIC combinations, as in L (speaker)-R (mic). Called for first is a mono file of the capture from your left speaker with your left microphone, or L-L. Next, is a mono file of the capture from your left speaker with your right microphone, or L-R. Continue with a mono file of your right speaker captured with your left microphone, or R-L. And complete the process with a mono file of your right speaker captured by your right microphone, or R-R. If you only have both speakers captured by both microphones, try the IR-1 efficient version of the plugin, which uses two mono files, L and R. ---
**Author:** ![simon.a.billington](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.waves.com/simon.a.billington/32/158_2.png) [@simon.a.billington](https://forum.waves.com/u/simon.a.billington)\ **Post date:** [April 16, 2024, 11:33am UTC](https://forum.waves.com/t/ir-1-asking-for-4-files-when-creating-custom-ir/8839/10 "2024-04-16T11:33:44Z")
Brilliant. This also clarifies some things!!