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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

Showing 2 responses by apogeum

apogeum
34 posts
 

I leave them up half way and adjust the rest with the PC sound card control which rarely goes above 50%.

Don't you lose some resolution  if you do it like that? Even with 24bit the limit is -24dB for digital volume control. I use a combination with digital volume control and Khozmo attenuators. That is for my feeling   the best compromise between not loosing resolution and at the same time keeping all the transients because I only need to shorten a tiny part of the signal to ground.
 

 

apogeum
34 posts
 

What Ohm value did you choose and why?

I use a 100K ladder type attenuator because I wanted the input impedance (100k) of my amp not below 50k after adding the attenuator. Input impedance should be in the range of 10 times or more the output impedance of what you use for driving the amp etc.

The other odd thing was a corded laser mouse. When I moved it around you could hear it also.

My feeling is that a USB interface with galvanic isolation and getting rid of some unnecessary background processes would already be a big leap forward while still using the Dell laptop. No more noise when using the mouse and less noise in general. The Xilica XP 4080 offers Ethernet and USB input. Don’t know about the XP-3060.

If the Xilica is only for DSP  you could also do it with software only like HQPlayer, writing the filters for the convolution engine  in REW, thus making it even more simple.

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