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Some rooms are cruel to bass and there are few options to get real bass without construction changes or very dramatic room acoustics interventions. I'll try post a pic of the current subwoofer setup i'm designing where a sub drops off below 30Hz but will go down "far enough" and have more...

Yep, and it's that room gain, which when harnessed with correct phasing which allows smaller units to punch above their weight in some rooms where the bigger units might burn off some of their potential once EQed. For larger home theaters, one can have one behemoth in a corner exciting all major...

That 35Hz null was common with all available subwoofer positions and the mains...there was enough headroom for any normal person. The biggest constraints were due to a projector screen interfering with mains horizontal positioning. I have frequently applied reasonable Q cuts around 20-40Hz post...

I have set up plenty of subs and usually modes and nodes are a bigger differentiator than the differences between most subs (within reason) . Multiple smaller subs with the correct processing (not all on .1 and global EQ) yields great results in my experience. In my book a 10 or 12 is a small...

I would start with a simple measurement evaluation to see how what measures correlates with your experience and then look at your options. Optimal setup can often times make up for the difference between the existing sub and an upgraded sub. Rooms aren't kind, getting the most out of them is...

The factors in the reduced motor strength also make for very repeatable motors within reason. Qts 0.6 suggests many things but around that mark I'd opt for for a 3" coiled woofer in numbers or look at fewer more potent options.

I put an ear out and their Qts apparently measures out closer to 0.6 . This is unfortunately quite typical of woofers in this price segment. Measures alright in the Italian / Spanish / Thai OE woofer they're copying but with the lower material grades and bigger tolerances the parameters end up...

Nick really knew his stuff when he designed the AE gear, aged really well to this day.

A quick model of strainger's room shows a 12m depth gives him some very nice gain 20-30Hz with some potential nulls mid 30s and 50s. Seems like a nice space for some HE bass exploration if the sub in question loads to about 30Hz in a corner.

Good move, it's amazing how small improvements in position can play out in more balanced LF. One can use pretty much any sealed speaker at the listening position. This hack allows one to get the data much more quickly. One can reverse process the nearfield response of the sealed speaker to get...

One really has to look at the room. Many paths lead to rome. If an IB manifold is placed sub-optimally, the fact that it has a virtually unlimited rear space won't make a difference in regards to the coupling between room and IB. For a single manifold it's often worth while investigating the...

Around fs of such systems, usually the room modes dominate and the differences between woofers can be EQed if one is open to such processing. Placement of the manifold is a far more important concern. I have two 18" folded TL sonotubes gathering dust if anyone wants to try the approach in a room...

The big IBs are best modeled with advanced tools to optimize, there is not just a room and a speaker overlaid but they influence one another. Big horn subwoofers have similar mechanisms of operation which can yield some truly stupendous results if optimized.

There is a half wavelength resonance in an IB manifold which will resonate like an organ pipe. Distortion harmonics in the driver will excite this resonance if you encounter significant distortion regardless of the filter before it, so it's worth paying attention to.

I recently built an OB again and found them dry and fun. 100dB sensitive on axis (~95dB power response) out of 4 ohms reminds one of why these are such bang for the buck, a whole lot of fun. I think people no longer post DIY threads unfortunately, the culture has waned and in stead of extensive...

Active elevates horns, the designs dragging along the old lore are just too compromised other than having a presentation that demands attention. With low resonance and well behaved horns in the time and frequency domains, the presentation goes from hash to focussed by pulling everything together...

You get your sparky to install a plug line on the supply side with its own RCD for the meter.

When looking at measurements, one tries to split off ones analysis in the modal region typically 200Hz and below and the region above. I would investigate what's going on at 500, 350 and 200Hz based on the waterfall plot in the midrange, perhaps there is a reason for the energy at those...

The devil is in the detail. Many of these slatted walls are built to serve with a tuned rear cavity only a few cm deep for the application of conference/board rooms where they work really well. I have seen both felt-backed and slotted MDF backed units with open area percentages that somewhat...

tl;dr fiberglass is more absorptive at the same density. Rockwool works great with a membrane front. Rockwool is cheaper, however the locally manufactured rockwool usually has greater reflectivity and lower absorption than the overseas items. The fiber diameter is greater and more variable than...