New 15th July firmware update - high-pass and low-pass filters in EQ PEQ settings

[C0mbat]

Hi all,

I noticed my WiiM Ultra updating this morning so checked what was in the latest updates page (see below). There's a new PEQ feature that has added high-pass and low-pass filters. I initially struggled to find them but they are new drop down filter options in the EQ settings (you need to be on the Parametric EQ tab).

These settings seem to allow you to use one of your 10 slots per channel for the high-pass and one for the low-pass. My assumption being that you're using this to potentially a) choose individual/independent cross-over points for sub vs the speakers (by using the Freq column) and b) set the slope for each using the Q column.

What I'm confused about is how to use the Q column to set the slope. I've used an SVS sub before and the app makes setting the slope really intuitive by a) showing you the default slope and b) having recommended options for what the slope could be changed to. By having to use the Q to key in a slope how are people meant to know what they are doing is a good idea or not? WiiM don't even tell you what the default slope is in the Subwoofer settings page. Surely a better approach to this would have been to create some intuitive settings in the Subwoofer settings page?

Next question, if you do use these filters then does it bypass the chosen Crossover Frequency setting in the Subwoofer settings?

WiiM Ultra Firmware Release Notes

This firmware update is being rolled out in stages, with devices updating sequentially over the next few days. It's important to note that the device's firmware version is distinct from the WiiM Home App version. To check your device's firmware ...

faq.wiimhome.com

 

[Wiimer]

Hi all,

I noticed my WiiM Ultra updating this morning so checked what was in the latest updates page (see below). There's a new PEQ feature that has added high-pass and low-pass filters. I initially struggled to find them but they are new drop down filter options in the EQ settings (you need to be on the Parametric EQ tab).

These settings seem to allow you to use one of your 10 slots per channel for the high-pass and one for the low-pass. My assumption being that you're using this to potentially a) choose individual/independent cross-over points for sub vs the speakers (by using the Freq column) and b) set the slope for each using the Q column.

What I'm confused about is how to use the Q column to set the slope. I've used an SVS sub before and the app makes setting the slope really intuitive by a) showing you the default slope and b) having recommended options for what the slope could be changed to. By having to use the Q to key in a slope how are people meant to know what they are doing is a good idea or not? WiiM don't even tell you what the default slope is in the Subwoofer settings page. Surely a better approach to this would have been to create some intuitive settings in the Subwoofer settings page?

Hi

This test by @dominikz may be helpful.

D

Post in thread 'WiiM Ultra Firmware v5.2.723250 Update - Jul 15, 2025'

Saturday at 1:06 PM

I have no idea (yet) What's going on in this case but the displayed transfer function does look wrong for sure.

The LP/HP filter visualization in WiiM Home App is incorrect, but the actual filter shapes when the response is measured look exactly as expected for any Q value (i.e. they measure the same as the corresponding generic "LP Q" and "HP Q" filters created in REW).

I measured this today on my WiiM Amp Pro, here are the results:


@WiiM Support Any plans to fix the incorrect/misleading HS/LS/HP/LP filter visualizations in the WiiM Home App EQ view?

• dominikz

• 

Next question, if you do use these filters then does it bypass the chosen Crossover Frequency setting in the Subwoofer settings?

I don't think so.

LP/HP is the same as PK or LS/HS - it allows full bandwidth adjustment of both the Sub connected to the Ultra's sub out and main speakers.

If the subwoofer settings has a crossover of 80Hz, and you set LP to 50Hz in PEQ, frequencies above 50Hz will be cut off. (You will probably hear very little sound from the main speakers.)

For multi-room playback of 2 WiiM devices, use HP for WiiM 1 (Main Speakers) and LP for WiiM 2 (Sub) to substitute as a crossover.

 

[Krabin]

My assumption being that you're using this to potentially a) choose individual/independent cross-over points for sub vs the speakers (by using the Freq column) and b) set the slope for each using the Q column.

What I'm confused about is how to use the Q column to set the slope. I've used an SVS sub before and the app makes setting the slope really intuitive by a) showing you the default slope and b) having recommended options for what the slope could be changed to. By having to use the Q to key in a slope how are people meant to know what they are doing is a good idea or not? WiiM don't even tell you what the default slope is in the Subwoofer settings page. Surely a better approach to this would have been to create some intuitive settings in the Subwoofer settings page?

Next question, if you do use these filters then does it bypass the chosen Crossover Frequency setting in the Subwoofer settings?

WiiM Ultra Firmware Release Notes

This firmware update is being rolled out in stages, with devices updating sequentially over the next few days. It's important to note that the device's firmware version is distinct from the WiiM Home App version. To check your device's firmware ...

faq.wiimhome.com

Hi!

Starting at the assumptions
a) Yes, but not with a single device. They apply to all the outputs including the line out, sub out, and digital outs like the other filters do. With multiple devices, then you could use one for subwoofers and one for mains.

b) Yes, the Q value does influence the slope, but more accurately, it determines the quality factor, which is basically the level of the cutoff frequency (the frequency you set it to) and the surrounding frequencies. A high Q raises them and can create a peaking resonance, while a low Q lowers them and rounds off the curve. Here is a post with some measurements I took of them that should hopefully help visualize it and a little more explanation:
https://forum.wiimhome.com/threads/...ls-hs-lp-hp-and-sub-crossover-are-doing.7710/

Unfortunately the graph in the app isn't accurate yet, so it's quite unintuitive, but fortunately they seem to be working on fixing that. No, it does not affect the sub crossover filter.

Feel free to ask more!