You Cant Buy It but you Can Build It


One of the things, well the primary audio thing that fascinates and pleases me to no end is superlative hand built systems. Not from boutique vendors but from audiophiles who want something they can't find on a shelf or buy.

  I am a minimalist and figure the fewer devices needed to get to great fidelity the better. I am in the camp that feels if you have to have a lot of devices or fancy exotic things in your audio stream then you began with the wrong speakers.

 My system consists of a Dell Workstation PC with the hi def Realtek driver installed. 1/8" jack out to XLR to either a Xilica XP3060 if the speakers need DSP and bi-amping or straight to the amp. From the Crown XLI800 amps to the speakers and that is it. 12gage zip cord from amps to speakers and crimp fork end connectors.

  The speakers are two way and consist of the following. A Klipsch K-402 horn with Klipsch 1132 drivers with the latest version phase plugs is the HF side of things. crossover point is 650 and 12db Linkwitz Riley with four PEQ's and gain set in the Xilica. Driver is full output to just over 18khz which is past where most of us can hear anyway.

 The LF bass bin is a horn derived from the Klipsch MCM 1900 MWM single fold bass bin. This bin was altered to have a 60" depth and 60" mouth (minus 17" in the middle for the woofer plenum)  and 18" chamber ht ID and to have a true 108" throat depth. Constructed out of 25mm Baltic Birch. Has a single K-43-K Klipsch woofer in there and goes down to 27hz before serious drop off starts. I have not figured out the exact DB efficiency of this system but figure it is somewhere north of 105db. There are four PEQ's and gain setting from the xilica for this bass bin also.

 

  What started this whole thing was I wanted to hear Bach Pipe Organ music like I was right there and the same for Cello chamber music. Or Japanese Fireworks or any thing else I could find of high fidelity that interested me. I have grown to like most things recorded well that I can find. Key here was life like reproduction as close as I could get using things I have heard in person as reference points. If the fireworks would impact me in person with a felt boom along with sound I wanted that. If the 32' pipe made things move around on table tops I wanted that. Now I rarely play at those volumes but if I want to I can. But I also wanted the true to life definition that would have accompanied this just like real life. I did not want someones idea of signature sound I wanted realism. Once the PEQ's are set I do not fiddle with PC EQ and leave it flat all the time.

 

  As a pure all horn system sound reproduction is effortless and the headroom creates superb sound at 75db as well as 105db and up if you care to go there. The Crown XLI800's are solid state and 200 watts per channel. I leave them up half way and adjust the rest with the PC sound card control which rarely goes above 50%. 

Total cost to build using todays prices and all new components would be about $7400. Frugal shopping for electronics will save you off that. My actual cost after hunting for a year of so was under $4000.

 Now a word about tube amps and DACs and all that stuff. The Xilica has the ability to basically tailor sound for almost any effect, if you take the time to learn to do so. Along the way you end up having to get Room Equalizer Wizard, or REW, which is free software for analyzing sound using your laptop and a calibrated UMike. These active DSP systems are NOT plug and play.

  Not all PC's will give you great fidelity. My Dell happens to be one of those fortunately. If you go this route make sure you download the latest Hi-Def driver for your sound card. If I was not happy with the sound card, or suspected it to not be good, I would get an aftermarket one.

 Peer validation is always nice and the stream of repeat visitors I have lets me know the pieces to this puzzle worked out well. I quit my search for better when I got these dialed in.

 

mahlman

Bob Carver's The Cube sub was indeed 12" x12" x12" and went down to 2Ohz loud! Long excursion butyl surround and a 2000watt class D amp (the size of a chocolate bar) inside. Now that's innovative thinking! Ditto for his Amazing Speaker from 1990 - four high-Q 12" woofers mounted vertically on one side of a six-foot trapezoidal open baffle crossed over passively at 100hz to a 60" ribbon mid/tweeter! 20hz to 20khz for $3000. Why bother with big horn-loaded boxes and complex active crossovers with multiple amps? 

I had that little carver subwoofer and it pressurized the room good, but didn't sound very good. My friend has the carver amazings, they aren't built very good and his apogee's blow them away in sound quality.

@sns      I agree with noise and funny things can cause them. Going to all SSD hard drives eliminated some and my corded mouse was guilty of more when moved while the stereo system was on. Beyond that there was and is no hum or noise audible when everything is turned up and the room is dead quiet with no music on. If I can't hear anything under those conditions I don't worry about things and leave them alone. As small as that Macmini is I can see you having interference where the much bigger PC box my Dell Precision resides in has components far more spaced out.

  @jasonbourne52  I know deep bass can be had that way but I still believe that a single fold horn with a cloth pleated woofer that hardly has excursion visible at fairly loud levels generates the cleanest sound. It would have been far easier to go the way you went as there are many DIY plans out there for these little box subs. At the end of the day precise sound was the main consideration for my build after getting to the wanted bass notes. There is a superior presence to lower notes that the club thump large excursion boxes just can't do, in my opinion. I know some of my friends really like the club thump though and build or buy just for that. Your small sub in my world would do Star Wars good but not pipe organ music.

Noise you can hear is not the problem, its internally generated noise raising noise floor, supressing signal/info/resolving power. Noise floors that aren't heard at idle do exist, you'll never understand until you experience.

 

Surprised a diy doesn't understand or experienced this.

@sns  OK I will bite. So how do you know this has existed on your setup and what did you do to stop it. I would also point out that just because you have had problems in this area does not mean I have thus experiences may differ.

  I guess part of my verification process involves people bringing their favorite music with them when they visit and telling me what they hear. Of course one could say that there is too much time between when they listen at home and when they listen here for the comparison to be valid. Over time though and with differing ears I reach a conclusion about my work and none complain about fidelity. 

  At some point in time even if others have found a way to tweak output to be better in their eyes that does not mean the next person will like it. I am really close to not looking for further improvements as I am quite happy with what I have and any fiddling is for academic purposes without much hope for real improvements. You come up with good suggestions and specifics that would apply to my system, and not be MacMini specific, I just might try them. My suspicions right now are that your tiny little PC has issues with interference mine won't have due to extreme overcrowding of components.