I think it is still debatable what is worse: 50Hz 4th order passive filter with huge transformers or FIR filter with separate high-quality DAC.I'm now using huge transformers, but willing to try FIR especially considering the fact that my music library is digital, because my favorite performers do not publish vinyl.So, it is already digital source and while it is digital why not to LowPass in digital ?I never suggesting it for vinyl.
| scooter wrote:|
1. Please take a look around this site for some intelligence on how detrimental digital room correction is and why. Romy and Paul are being excessively polite today regarding DSP, perhaps because the weather is nice. I'll be more direct - If you are taking the time to design and build a good system, why risk killing it with some half-baked DSP "solution"? Why not just design the system properly out of the box? DSP can be super useful for testing and system integration. Just put it back on workbench with your hammer and your chainsaw after you are "done."
I agree. LF is most difficult to implement. And this site has really unique content.But, you know, in my expirience, better quality LF is easier to integrate.Before Tapped Horns I used huge 21" driver in box from PHC (http://proaudiotechnology.com/assets/lfc_21sm_3_view_drawing.pdf)That was really difficult to integrate
|2. How many systems have you heard that properly integrate LF? Think carefully about why that is. |
There are only a handful of key elements, but you need to get them all right. Secondary elements are important, but secondary. LF is a different and extremely problematic beast because the room matters so much. Think carefully about why electronic DSP "solutions" could struggle with LF room nodes. Comments littered through this site can be a great guide.
No, when I say "true thunder", I mean that movie scenes with thunder is real!I use the same setup in my home cinema to impress my friends
|3. Also, I would like to address your "thunder" comment. A properly integrated system should be integrated. Seamless (well, as seamless as possible). Thus, if you notice "true thunder," your LF solution is not properly integrated (unless you are listening to recorded thunder). If that concept seems idiotic or trite or simplistic or childish, in your mind's eye, imagine how good music is realized in a good hall.|
I understand what you mean.I actually don't like my LF currently, but I know what is wrong. I've followed some suggestions which turned to be false.Soon I'll get 2m upper bass horn ready and change drivers in TH then hope to evaluate and share the result.
|4. Before moving forward, I think it would be a fun and useful exercise to spend a few weeks trying to get your current LF solution properly integrated. That is like taking one step back and three steps forward. I strongly believe the results will influence your new project.|
One thing is important to consider, that TH (as any other LF, I believe) works much more effectively in the corner.So, placing two of them in the corners is rational. HornResp gives +10db for my TH when I change Ang from 2xPi to 0.5xPi.But in my case, corners will be occupied by speakers, that is why I think to integrate them.May be it is good idea to build another two TH in parallel with first pair and move them around back or side walls to eliminate modes.
|5. I would like to concentrate on one element, emphasizing that by separating the LF physically, you will have an excellent "manual DSP"
solution, just put the LF boxes on sliders and shuffle them around the
room to find "optimal" placement. Once you find the "best" placement, you can easily adjust gain. I think that is a good "brute first step" for proper integration. Some people may not need to do this type of testing, but do you honestly think you have the ability to model your room's LF response without physical experimentation with absolute certainty? I certainly don't have that ability. And what if your wife redecorates the room, remodels the room, or moves you to another house? Regardless, the option to move LF around for "free" is quite a valuable "option" in the experimental phase. |