The perfect satellite/subwoofer system ...


...is essentially a 4-way system and preferably fully active.

Bear with me.

The original satellite/subwoofer systems were often 2-way satellites with a subwoofer, or a 3-way system. This caused a number of problems which I think have overall contributed negatively to their acceptance in the modern day audio world. Either the satellites were too small, and had a high crossover to the subwoofer or they used larger mid-woofers and then the the tweeter crossover was too low, again limiting the dynamic range of the system as a whole. 

A perfect satellite/subwoofer system has to have lots of dynamic range in the satellite and the subwoofer along with excellent vertical and horizontal dispersion. The 2-way + sub is a compromise.

Also, by going active we can achieve something we almost never see in passive speakers:

Perfect 4th order filters.

That gives us excellent vertical and horizontal dispersion (assuming the right size drivers).

The solution is, perhaps, using a 3-way satellite system with 4th order (electro + acoustical) filters, and an expected -3 dB point of ~ 80 Hz (the THX standard). As part of this equation it also means the 3-way ends in an 8 or 10" woofer, which being bandwidth limited is going to have excess dynamic range.

Yes, I’m bored, and yes I’m hoping to take some wind out of the discussion about science vs. A’gon. :D

erik_squires

Showing 1 response by m-db

Being a hack with only a pair of dated Mackie powered PA speakers as my only active speaker reference, any taking of wind is out.

I do believe a much finer level of subwoofer integration has been easily obtainable for well over a decade. Like most aspects of this hobby if you haven't heard it you simply can't know whats missing. More importantly, just how simply it is to use.   

When my push pull tube amplified mains were down I repositioned my HT two-way Triangle Comet's in their stead, leaving the two Velodyne DD-12 Plus subs in the rooms Crawl established asymmetrical bass modes.

After choosing the laptop or TV, plugging in the mic and loading the Sweep Tone CD I ran the twenty minute Plus Auto EQ through the Triangles and the subs to compensate for the speaker change. To better compensate the subs to the Triangles basic low frequency presentation I play a self recorded file of my Double Basses and drums through the Triangles and the subs.

To further tweak to my taste I used the manual drag and drop of the Velodyne Plus Frequency Response and Parameters Screen. I slightly altered by ear the Q (bandwidth) Parametric Filter within the 40-50Hz and the 50-63Hz bands which also changes the slopes on both sides of the filters. These changes are easily audible to anybody when playing a very familiar recording. Saved to memory in any of the six customizable presets while the mains remain in the analog domain. That's it.

While these adjustments are covered on pg. 10-11 in the Velodyne User Interface Manual they neglected the how to and what to listen for. Even though music fans don't have that you-are-there post production experience of their favorite recording, subjective satisfaction can easily be accomplished. Without trial and error subwoofer room positioning, manufacturers predetermined auto only equalization or a third party download and accessories. 

Most, if not all the professional periodical reviews also neglected to get past the Plus' very effective, now over twelve year old system and room Auto EQ optimizing feature. Sadly for the home audio community, during Velodyne's time remaining the manufacturer's priorities took a dramatic turn. 

http://velodyneacoustics.com/pdf/digitaldriveplus/DD+Manual.pdf https://www.velodyneacoustics.com/pdf/digitaldriveplus/DD+UserInterfaceManual.pd