Benchmark DAC-1 mods

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audioengr

Op-amp replacement
« Reply #20 on: 17 Apr 2005, 06:27 pm »
Finally, some customers have requested the op-amp replacement for the Benchmark DAC-1.

The result is quite remarkable.  In fact, using the balanced outputs, it outperforms my reference, the Perpetual P-3A.  Best sounding DAC I have ever heard.  Uncanny soundfield, almost scary when noises appear to come from the room instead of the recording.....

I am planning to prototype a Superclock3 for the Benchmark DAC-1.  The frequency required is not available, so I'll have to mod a 27MHz unit to make it work.  Ordering parts today....

audioengr

Benchmark DAC-1 mods
« Reply #21 on: 20 May 2005, 05:36 pm »
The SuperTurboclock for the DAC-1 has been modeled and successfully installed in a customers unit.  It is an improvement over the stock clock module, probably 10% better.  This has been added as an option on the website.

sevenfifty

  • Jr. Member
  • Posts: 4
Benchmark DAC-1 mods
« Reply #22 on: 17 Aug 2005, 08:28 pm »
Hi everyone. I browse here occasionally and spend some time at head-fi. I have read some posts here on Empirical Audio when I was considering upgrading my DAC1. I ended up going with the turbomod done by Steve at Empirical Audio. I just got my unit in last night and wanted to share my initial impressions. I posted here as well as audiogon b/c I checked out these two sites when I was researching upgrade options.

I have only spent about an hour with it, so these are very initial impressions only. I also have an un-modded DAC1 that I have been using while my other was being modded by Steve, so the sound of the un-modded unit is fresh in my mind. Also, please note that I'm using an unmodded Marantz cd5400 as a transport. I am using the RCA outs to a Singlepower MPX3 headphone amp which is driving a set of Sennheiser 650 headphones. Basically, I noticed an immediate improvement in overall sound quality. The two most noticable areas were an increase in level of detail, especially in the mids and highs as well as a markedly increased sense of 'air' around the notes. The combination of these two factors really takes the sound of my setup to a whole new level. I once again found myself dragging out discs I haven't played in a while and hearing things that I had not heard before. And this is with no burn-in time on the unit as well as using the unbalanced RCA outs. Steve says the XLR outs are even better, so I can't wait to try those. Overall, I've only listened for a short time but my initial impression is very positive and I already feel that the upgrades were worth it. I listened to my unmodded DAC1 before plugging in the modded one, and there is definitely quite a difference. Hope this helps anyone considering this mod. I will post more impressions once I get more time with the unit.

TheChairGuy

Benchmark DAC-1 mods
« Reply #23 on: 17 Aug 2005, 09:19 pm »
Yep, not sure how he does it, but Steve gets better treble response out of CD than any SACD I've heard (modded or stock)...whether it's my MSB Gold III or his Perp Tech that I've heard at a couple CES Shows now.

I don't have a big room, so really gargantuan bass is wasted and lost, but high hats/cymbols and upper register piano notes are alive here with 'air' and distinct placement.

Enjoy - wait till you mod (or buy newer, better) that transport.  It's a bigger deal than you'd think it could be.  Many here have now found that out with Steve....

sevenfifty

  • Jr. Member
  • Posts: 4
Benchmark DAC-1 mods
« Reply #24 on: 18 Aug 2005, 02:05 am »
Quote from: TheChairGuy

Enjoy - wait till you mod (or buy newer, better) that transport.  It's a bigger deal than you'd think it could be.  Many here have now found that out with Steve....


Unfortunately for my wallet, I'm now a believer. But my ears sure are happy 8) . Hopefully the new/modded transport will be on the way soon.

One thing I've noticed while listening this evening - I think some of the sense of air has to do with not only the increased detail, but the reproduction of low level sounds i.e. the reverberation of percussion, etc. off of the walls of the studio/hall. Must keep listening....

sevenfifty

  • Jr. Member
  • Posts: 4
Benchmark DAC-1 mods
« Reply #25 on: 28 Aug 2005, 08:29 pm »
Okay everyone, here are the results of my comparison of my stock DAC1 vs. the Empirical Audio modded DAC1 (including  opamp replacement and superturboclock3).

My setup is as follows:

Source: Marantz cd5400 digital out via coax using Cardas digital high speed cable with bnc adapter included with DAC1. I have 2 DAC1 units. A stock version and one turbomodded by Steve at Empirical Audio. I connected both DAC1's simultaneously to my dual input Singlepower MPX3 via Outlaw Audio PCA 0.5m RCA interconnects. I was therefore able to switch between sources via unhooking the Cardas cable from the stock DAC1 and hooking it up to the modded DAC1 and vice versa, and then switching from input 1 to input 2 on my MPX3. The time to switch b/n sources took approx. 15 seconds. The signal path from the Marantz to my HD650/Zu combo was identical from the cdp->Cardas->bnc adapter (included w/ DAC1)->DAC1->Outlaw PCA IC->MPX3->Zu->Senn650. The stock power cords were used with the DAC1s, ground pin lifted via adapter.

Now, although this is a work in progress, here is a summary of my experience thus far:

First, while listening to jack johnson's cd on and on I noted that the cymballs with the EA unit were more extended in frequency, more detailed such that I could hear the impact of the cymballs and the rattle of each as they were played. Midrange was much smoother and more realistic, as well as more liquid sounding. And the bass was definitely tighter and deeper.

Moving on to the Garden State Soundtrack, the shaker on Thievery Corp.'s Lebanese Blonde sounded much more "in the room with me" than the stock unit. The separation of instruments was much better and the bass lines were more well defined and better controlled.

On Iron and Wine's track, Such Great Heights, the vocal texture was much more complex and I could hear at least 3 distinctly seperate voices during harmony, while listening through my stock dac1 I was unable to differentiate the voices. Also, the analog tape hum/detail was actually much more detailed w/ the modded unit ;). The other thing I noted was that I could almost 'see' the guitar strings being picked with the EA DAC1, as opposed to just 'hearing' the notes through the stock unit. Almost as if the stock box sounded compressed in comparison.

Then after throwing in the remastered 1984 from Van Halen, there just is no comparison. The drum intro on Hot for Teacher just has more air, more high frequency extension, and more detail than the stock box. Not to mention the tonality and harmonics of Eddie's guitar.

Finally, I listened to the AC/DC remaster of Who Made Who. The detail,air, high frequency extension and seperation of instruments is just unequaled by the stock unit. Bass control and depth is also unmatched.

So, after comparing apples to apples, I remain extremely pleased with my modded unit. My overall impression is that the modded unit adds musicality, detail, and removes a layer or two of 'veiling' from the sound of the stock unit without sounding bright or sibilant and maintaining a high level of musical enjoyment that I have not previously experienced. High frequency extension is improved without being sibilant or bright, bass detail and control is improved, and midrange detail has improved as well. Are the upgrades worth it? I certainly think so. This is exactly what I was hoping would come from modding my dac1. I guess the only way to tell for sure is to compare my box to other high-end sources in the same/higher price range. Hopefully I can do this during upcoming head-fi meets. In the meantime, I certainly recommend these mods and I am definitely going to have Steve work on my transport as well. Please let me know if any of you have any questions.

sevenfifty

  • Jr. Member
  • Posts: 4
Benchmark DAC-1 mods
« Reply #26 on: 4 Sep 2005, 02:03 am »
Ok, here are my speaker and headphone out impressions:

Thursday I packed up my mpx3 to send back to Mikhail as I am upgrading to a Supra. Which I figured would give me plenty of time to compare the headphone outs on my stock and modded dac1's.

Well, I have had time to compare the headphone outs. And the results are quite disappointing. There definitely is a difference b/n the two headphone outs, but it is nowhere near the difference I noted using my mpx3. So I listened a bit, switching back and forth b/n the modded and stock unit via disconnecting and reconnecting the cardas coax out from my marantz cdp used as a transport. In comparison to the mpx3, I find the headphone out on the dac1 to be rather stale and uninvolving in comparison. I listened long enough to compare the headphone outs b/n the stock and modded and have come to the conclusion that while there is a small difference, this is not the intended use for this unit. Neither in stock nor in modified form.

Listening through the head-outs was actually so uninvolving that I actually stopped out of relative boredom - I felt as if though I were listening to my now sold _relatively_ low end SS head amps.

Now, after acquiring my mpx3, I had become so enamored with its sound, that I have basically neglected my speaker setup for months. But now that the mpx3 is gone, and I found myself not enjoying the head-outs on either dac1 to any significant degree, I thought, well, might as well hook up both the stock & hot-rod dac1 to the speakers and see what happens. After all, a few people here have alluded to the benefit of the modded dac1 w/ speakers.

So here's my setup:

Toshiba 4900 dvdp -> Straightwire 1.5-2.0m digital coax -> BNC adaptor -> Stock & Empirical Audio modded DAC1 (manually switched) -> Outlaw Audio 0.5m PCA IC -> NAD S100 Preamp -> Outlaw Audio 0.5m PCA IC -> NAD S200 Amplifier -> DH Labs Silver Sonic T-14 Speaker Cable -> Madisound Cygnet Mark 1 Speakers (Utilizing Peerless 8" Driver and Peerless Fabric Dome tweeter). Simultaneous output from preamp goes to NHT X-2 crossover to Rotel RB-870 BX (one channel) amplifier to Madisound NHT1259 Subwoofer and cabinet via Straighwire IC.

I sat in the sweet spot on my couch and used Feist's cd Let It Die as my source disc. I was immediately reminded of the results I obtained when using the rca outs with the Singepower. High frequency extension was much better. Sense of air surrounding instruments was much better. Textural detail of vocals was much, much better. Bass extension and control was much better. But the biggest difference I noticed with my speaker setup is that overall musical enjoyment and involvement was significantly better with the modded dac1. My speaker rig doesn't have the greatest soundstaging, so I can't comment on that too much, but overall dynamics and sense of realism/live performance-in-front-of-you were basically in a different league than the stock box. As a matter of fact, it has added such new life to my speaker setup that I'm considering having my 2nd dac1 modded as well.

In summary, I must say that the headphone output mod, while providing a slight difference, is not really worth the extra cash. At least according to my ears and my 650s.

Alternatively, utilizing the rca outs to both my Singlepower mpx3 setup and my speaker rig, there is basically no comparison and the more I listen, the more I am thrilled with my mod investment. My original plan was to sell my 2nd dac1 to pay for the mods on the 1st one, but after listening to this extent, I am seriously considering sending my 2nd dac1 in to be modded as well so I can throw it into my speaker rig, as it has really provided a kick-in-the-pants that has been missing over the last few months.