Subwoofer addition to Sasha

Hi...in incredibly in-depth article from Roy Gregory just came out about adding subs to Sashas...you have probably seen it. But just in case, here it is:

http://www.theaudiobeat.com/blog/vtl_wilson_system.htm

alfa100 said:

thank you LL21 i can se u have a big DD18+ Please tell me how u have it set up. you may pm me.

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Happy to help...i benefited from the distributor himself coming to calibrate the system and show me (twice) how its done.

1. My system is the Wilson X1/Grand Slamms...so i am able to run them full range and NOT have to cross them over which is fortunate in terms of the setup. It means i dont have to worry about a crossover compromising the quality of the full range sound from the main Wilsons.

2. I then placed the Sub in 1 of 2 places where it could possibly go in the room and off-hand, its not bad sound

3. I then used the Velodyne Microphone and test sweep CD to basically play from 15hz-200hz over and over...and OVER again...while making adjustment to the following controls on the Velodyne. Each time the sweep came (it was on infinite repeat on my Transport for about 2 hours)...i could see how each change i made altered the frequency response

- 8 band EQ from 15hz-200hz. I could push up or down the frequency in any 1 of 8 different frequencies that are selectable between 15hz and 200hz
- I can then change the 'Q' around the particular frequency so that if i am suppressing the decibels at that frequency, i can also broadly affect frequencies just above and just below that spot...or very narrowly affect frequencies above and below...(ie, for a 30hz suppression, i could apply it to frequencies between 20-40hz or only 27-32hz
- I can then cut off the Velodyne above a certain frequency and choose the roll off...in my case 42hz at 24db rolloff
- I can then cut off the Velodyne below 15hz using various roll-offs...in my case, 24db again because the room did not tolerate sub-15hz frequencies too well...too much 'roar'
- I can then can minimize or maximize servo response...which self-corrects the cone movement by comparing the signal to the movement 3,000 times/second or something. i always use MAX servo

There were also a few other settings (like movies vs music) which i did.

So far so good...hope that helps. The frequency is now flat from 15hz-200hz to around 3db+/-. and about 1.5db+/- from 20hz to around 100hz.

LL21 said:

Hi...in incredibly in-depth article from Roy Gregory just came out about adding subs to Sashas...you have probably seen it. But just in case, here it is:

http://www.theaudiobeat.com/blog/vtl_wilson_system.htm

Click to expand...

This article makes me travel back ten years - my only really successful experience with subwoofers was using the Watchdog II with the Wilson Watt/Puppies 7. I have to say it was a period of musical enjoyment. Unfortunately I was never able to get a second similar woofer. Only much later I found that the german Audio magazine had given an higher score to this combination than to the Maxx2's.

BTW, the old Watchdog II was a bargain - it included the controller and a custom 400W amplifier designed by Richard Marsh.