Not so Easy to Skip the Preamp?

I assume you have tested all of the components individually in other systems and they are all working properly? If so, then what computer type are you using and what playback program? Have you checked that the computer output to the Hagtech, and the Hagtech to the DAC are all configured with compatible bit depths and sample rates? If you are using a Mac and iTunes, you must restart iTunes after changing the parameters in Audio Midi Setup.

As someone mentioned above, if you are sending 16 or 20 bits, you may also be throwing a lot of bits away. Is the volume in iTunes (or whatever your playback program is) set very low? If so, you may want to get a couple of passive attenuators and put them between the DAC and amp. They should have enough attenuation so that you playback program is near full volume at normal listening levels. You can get decent ones from Parts Express for about $25, or "audiophile grade" ones from Rothwell or elsewhere.

4est

One of the reasons I thought I could get away with no preamp is because the Behringer has volume controls for each channel.

CBW723

Yes, it sounded so bad that I switched out the monitors, then made sure I was using the same cables and everything was fine.

Also, the DAC has sounded great in another application.

Re computer program, I use Windows XP and I am not an expert, but the OS usually recognizes whatever I plug in and it works fine.

For playback, I am using lots of different things, but Foobar and WAV files whenever I am testing, and in this case to discover how bad it sounded.

Re "sending" 16 or 20 bits or whatever.....not sure how to change those settings, but I think in "preferences" in Foobar.

But I am not talking about splitting hairs - I am talking about really pretty bad, muffled, veiled, distorted sound compared to the same amp and the same speakers and the same cables in another desktop system.

Everything is the same, other than the fact that the good sounding desktop signal first goes through a Behringer DEQ2496 which functions as a preamp of sorts.

So I would guess either an "impedance mismatch" of some sort, or insufficient gain, but again, a bit puzzling and appreciate all suggestions.

Oh...full disclosure....

As I was hoping to A/B compare this system with a leaner, meaner (?) Hagtech interface straight into the Audio Research DAC, I did not switch out the Behringer amp as that is what I am using in my other desktop system.

So I suppose there is a greater than 0% chance that the amp is defective or needs repair?

But I have a few of them and have generally had 0 sound or reliability issues with them.

So still a bit puzzled why it wouuld sound surprisingly bad, when all my other Behringer desktop systems have sounded surprisingly good.

I'm a little confused. Is your setup like this?:

Computer->Hagtech->DAC5->DEQ2496->A500->Speakers

If so, what role does the DEQ2496 play?

Better check the amp. You may have been lucky with the A500s, but I was not. For me, 3 out of 5 were bad, one within a month, two straight out of the box. I also found that the volume controls are not good—best to leave them at full output.