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In the Forum: Audio Discussions
In the Thread: Sub-woofer integration with mains
Post Subject: Re: Sub-woofer integration...Posted by Romy the Cat on: 7/1/2005

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 skushino wrote:
The sub arrived before the main speakers, so I practiced integration with my existing speakers.  They are rated full range to 20Hz, so I expected little change in performance.  Instead, what I noticed with the addition of the sub was two things:  1) better sense of acoustic space and 2) better HF playback.  The added bass was mostly noticed only when level (crossover and/or gain) was set too high.  The portrayal of acoustic space is very beneficial in my smallish 15' x 18' listening room.

Scott, I do not see anything extraordinary. What you mentioned are some of the very normal benefits of using a LF dedicated channel (I tend do no use work subwoofer)

 skushino wrote:
Now, I'm working on integrating with the horn main speakers.  This is more difficult due to the higher crossover freq.  Question: Can anyone share a disciplined process to optimize the sub?  Placement, level, crossover, bass boost, phase, etc.  Without a disciplined approach, the combinations of variables is infinite.  How do tools like RTA figure into the process, vs using your ears?  I have done some experiements with placement, but size and weight deter me from endlessly moving the thing around the room. 

As far as I understand you are using the Edgar’s Seismic Sub. It is OK unit (not without some cruel compromised). I do not know how are you planning to use it as you have just one of them and I am a firm believer that one LF source MUST NOT be used under any circumstances… and particularly at 80Hz. Get another unit and then you will be able to get a result worth something. Anyhow, to set up it properly, and particularly if you have no experience with it, there is no other ways then to use a 1/12dB RTA. I would have difficulties to comment on phasing and some other issues on this sub as this sub is time-wise completely screwed, as most of that type bass horns are. As I can recall Edgar used some kind of very high order filter in there with very heavy EQing the bottom response… So, only God know what is going on in there phase-wise and I would not worry about it. Besides, in the 15' x 18' listening room you have no leverage to manage it anyhow…. So, buy, borrow or steal an analyzer and then everything will be juts started….

Rgs,
The caT


 

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