WiiM Sub Pro User Experience

adias

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I never found a need to use subwoofers in my audio systems until now. That is because I never felt necessary to complement the bass end of those systems; they sound balanced to me and appropriately wide ranging for the mostly classical and jazz music playback I favor.

The exception is a new audio playback system I set up in my garage. Never paid much attention to detail there, given its role as a fill-in music background setup. My interest in its playback quality peaked when I installed the recent WiiM Amp Ultra (see comments HERE). That system plays through a pair of very affordable Neumi BS5 bookshelf loudspeakers which are actually surprisingly good and well reviewed. Of course, their bass response starts to drop below 80Hz or so, and I thought they could be complemented by a subwoofer. Enter the WiiM Sub Pro.

The Sub Pro is delivered in a fairly large box (21x18x18") and weighing over 30lb. To reach the unit there are actually 3 boxes - the outer one, a second one glove-fitted to that and again snuggly inserted in that a third one with product picture and other details, and... inside that surrounded by hefty foam inserts and inside a fabric bag, the unit itself.

Two outer cardboard boxes:

IMG_0790.JPG

Inner product box:

IMG_0791.JPG

IMG_0792.JPG

Encased in foam surround-filling: product manual and box with power and RCA cables:

IMG_0793.JPG

Finally product wrapped inside fabric bag:

IMG_0794.JPG


The Sub Pro is a handsome piano-black finished box with a bottom cavity, open front-to back. The subwoofer's driver and port are firing down into that open cavity.

IMG_0801 2.JPG


The Sub Pro has in the back left-to-right connections for Power, Ethernet, and RCA and a Reset pushbutton.
Screenshot 2025-08-16 at 9.20.36 AM.png

The Sub Pro manual recommends a RCA connection for best performance, but preferring to reduce cabling I opted for WiFi as a signal connection. I found that the WiFi connection worked just fine.

I positioned the Sub Pro near a cabinet/back-wall corner, on the floor, aligned on the same frontal vertical plane as the main speakers (a conventional subwoofer position).

As many other WiiM products, setup is a breeze. Connect the power cable to the Mains, fire ap the WiiM Home App (WHA) and push the Reset the button on the back of the subwoofer. On the WHA, on the Devices tab, click 'Add Device' and poceed to install the Sub Pro. I chose to connect it with the WiiM Amp Ultra.

Once the new WiiM sub Pro is installed, its performance parameters are adjusted under the attached device Settings (in my case the Amp Ultra). There are controls for device Level, Crossover Frequency, Phase (0 or 180).

Since I knew the bass characteristics of the main speakers I initially chose a crossover frequency, set the Sub Pro level to +3dB and started playing without any other equalization, neither for main speakers or Sub Pro. What I heard was a more natural wide-ranging sound presentation. I did not hear boom bass, or even noticed the subwoofer playing, but simply removing the Sub Pro from playback the sound field changed, losing its former presence. This fits my goal of extending low frequency response naturally, without an artificial overblown booming bass. I imagine for those seeking that, increasing the Sub Pro Level digital control will provide that.

For further setup detail see Factory Setup Instructions HERE.

My next step was to experiment with the RoomFit technology. One does that correcting separately the Sub Pro and the main speakers. The Sub Pro RoomFit process is found under the WiiM Sub Pro section of the attached WiiM device (the Amp Ultra in this case). In addition a RoomFit analysis for the main speakers should also be done taking into account the presence of a subwoofer - I chose to run the RoomFit for those starting just slightly below the sub crossover point.

As usual with room correction approaches, I am still fine tuning the parameters and listening to decide what I want as sound filed presentation. But, in my case, with pretty neutral mains speakers a slightly elevated Sub Pro sound level is quite good indeed!


For further RoomFit details see Factory Sub Pro Room Correction Instructions HERE.
 
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I never found a need to use subwoofers in my audio systems until now. That is because I never felt necessary to complement the bass end of those systems; they sound balanced to me and appropriately wide ranging for the mostly classical and jazz music playback I favor.

The exception is a new audio playback system I set up in my garage. Never paid much attention to detail there, given its role as a fill-in music background setup. My interest in its playback quality peaked when I installed the recent WiiM Amp Ultra (see comments HERE). That system plays through a pair of very affordable Neumi BS5 bookshelf loudspeakers which are actually surprisingly good and well reviewed. Of course, their bass response starts to drop below 80Hz or so, and I thought they could be complemented by a subwoofer. Enter the WiiM Sub Pro.

The Sub Pro is delivered in a fairly large box (21x18x18") and weighing over 30lb. To reach the unit there are actually 3 boxes - the outer one, a second one glove-fitted to that and again snuggly inserted in that a third one with product picture and other details, and... inside that surrounded by hefty foam inserts and inside a fabric bag, the unit itself.

Two outer cardboard boxes:

View attachment 25554

Inner product box:

View attachment 25561

View attachment 25556

Encased in foam surround-filling: product manual and box with power and RCA cables:

View attachment 25557

Finally product wrapped inside fabric bag:

View attachment 25558


The Sub Pro is a handsome piano-black finished box with a bottom cavity, open front-to back. The subwoofer's driver and port are firing down into that open cavity.

View attachment 25562


The Sub Pro has in the back left-to-right connections for Power, Ethernet, and RCA and a Reset pushbutton.
View attachment 25560

The Sub Pro manual recommends a RCA connection for best performance, but preferring to reduce cabling I opted for WiFi as a signal connection. I found that the WiFi connection worked just fine.

I positioned the Sub Pro near a cabinet/back-wall corner, on the floor, aligned on the same frontal vertical plane as the main speakers (a conventional subwoofer position).

As many other WiiM products, setup is a breeze. Connect the power cable to the Mains, fire ap the WiiM Home App (WHA) and push the Reset the button on the back of the subwoofer. On the WHA, on the Devices tab, click 'Add Device' and poceed to install the Sub Pro. I chose to connect it with the WiiM Amp Ultra.

Once the new WiiM sub Pro is installed, its performance parameters are adjusted under the attached device Settings (in my case the Amp Ultra). There are controls for device Level, Crossover Frequency, Phase (0 or 180).

Since I knew the bass characteristics of the main speakers I initially chose a crossover frequency, set the Sub Pro level to +3dB and started playing without any other equalization, neither for main speakers or Sub Pro. What I heard was a more natural wide-ranging sound presentation. I did not hear boom bass, or even noticed the subwoofer playing, but simply removing the Sub Pro from playback the sound field changed, losing its former presence. This fits my goal of extending low frequency response naturally, without an artificial overblown booming bass. I imagine for those seeking that, increasing the Sub Pro Level digital control will provide that.

For further setup detail see Factory Setup Instructions HERE.

My next step was to experiment with the RoomFit technology. One does that correcting separately the Sub Pro and the main speakers. The Sub Pro RoomFit process is found under the WiiM Sub Pro section of the attached WiiM device (the Amp Ultra in this case). In addition a RoomFit analysis for the main speakers should also be done taking into account the presence of a subwoofer - I chose to run the RoomFit for those starting just slightly below the sub crossover point.

As usual with room correction approaches, I am still fine tuning the parameters and listening to decide what I want as sound filed presentation. But, in my case, with pretty neutral mains speakers a slightly elevated Sub Pro sound level is quite good indeed!


For further RoomFit details see Factory Sub Pro Room Correction Instructions HERE.

Thanks for the excellent review 👏😊

Is it possible to shoot the driver through the slot? I'm interested in the shape and arrangement of the port.
 
Excellent user review. Thanks.

The construction is interesting: A bass reflex speaker firing into a ported cavity. Depending on tuning one could achieve a 6th order acoustic rolloff.
 
The Sub Pro has in the back left-to-right connections for Power, Ethernet, and RCA and a Reset pushbutton.
View attachment 25560

The Sub Pro manual recommends a RCA connection for best performance, but preferring to reduce cabling I opted for WiFi as a signal connection. I found that the WiFi connection worked just fine.
Thanks for the detailed pictures and writeup!

So the sub can be connected via Ethernet or WiFi as a management path for firmware updates and device control, but also Ethernet/WiFi as a signal path in addition to the preferred RCA cabling.
 
Like the opening post, I had never felt the need for a subwoofer in my setup but in a "why not" moment, I thought I'd give a WiiM Sub Pro a go.

I sit around 2.3m in front of my main speakers and have the Sub Pro tucked under my main wooden/ glass shelves where the rest of my gear is housed, resting on a 1cm rubber anti-vibration mat on top of an engineered hardwood floor. It’s maybe about 6-8” from the back wall, roughly half way between the speakers, but I’m really restricted re where I can place things so I’ll need to make the best of what I have. My room is a long and narrow lounge/dining room and I listen to music in tv in the lounge half, firing across the narrow width.

My listening levels are modest, typically around 60-65db measured using the sound meter app on my phone. I have a WiiM Ultra feeding fixed volume into my Linn MDSM/4 amp over USB, and the Sub Pro cabled to the Linn’s RCA outputs using a y-cable, driving my Linn M109 bookshelf speakers whose specs are as follows: frequency range: 72Hz–>20kHz, impedance: 4 ohms, sensitivity: 88dB/W/m (1kHz).

As I’m using Linn’s Space Optimisation (SO) for room correction (which I’m used to and spent a long time taking room dimensions etc to set up), I’ve not used Roomfit for the Ultra nor Sub Pro but might use EQ/PEQ as the mood takes me. The Linn also plays the audio from my TV (or strictly speaking from the Fire TV Cube plugged into the amp) and the Sub Pro is still on when I watch TV but it’s early days as to whether I notice any big difference there. I also use a Harmony Hub and remote to control the amp and TV, so everything is pretty well integrated.

After some listening tests using the tracks and the methods suggested by CoPilot below (I know, I normally eschew AI answers, but it was useful in this instance), I settled on Level: 0db, Crossover Frequency 84db, Phase 180 for the Sub Pro settings.

🎧 Subwoofer Integration Walkthrough Playlist

Stage 1: Phase & Timing

Listen for punch vs smear. Flip between 0° and 180° phase settings.

1. “Royals” – Lorde
Sparse mix, deep pulses. Bass should feel tight and centered.
2. “Billie Jean” – Michael Jackson
Kick and bass groove — listen for snap and drive.
3. “Dreams” – Fleetwood Mac
Subtle low-end — phase issues will hollow it out.

Stage 2: Crossover Matching

Adjust crossover between 70–90 Hz. Listen for seamless handoff.

1. “Teardrop” – Massive Attack
Layered bass textures — should feel unified, not separate.
2. “So What” – Miles Davis
Upright bass clarity — check for low-mid overlap.
3. “Rosanna” – Toto
Kick and bass guitar interplay — crossover affects punch.

Stage 3: Level Balancing

Set sub level slightly hot, then dial back. Avoid boom or dominance.

1. “No Sanctuary Here” – Marian Herzog & Chris Jones
Deep bass with vocal — sub should support, not mask.
2. “Angel” – Massive Attack
Sustained low-end — check for modal ringing or bloated decay.
3. “Limit to Your Love” – James Blake
Sub drops to ~30 Hz — test extension and room response.

I’ve left the system playing a variety of music and the Sub Pro now appears to be well integrated with the overall sound, lending a bit more body and bottom end rather than the muddy separate thumps I heard when I first tried it elsewhere in my room.

It may be a keeper ;)

Addendum: in terms of 'keepers', my Linn amp and speakers are keepers too. I'd always aspired to owning Linn kit, in part admittedly because of the brand cachet and build reputation, but also because they're a very local company. They started out in a small factory on the edge of a social "housing scheme" barely ten minutes from where I live before moving to their custom built factory in greener surroundings, again around twenty minutes from my house. Each piece of kit is assembled by one technician who signs it with their name, and they also bear the motto "Clyde Built" in tribute to the quality of the ships Glasgow once assembled. If that puts me behind another "loyalty wall", so be it.
 
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