Tight and extended bass. Black I mean totally black background. Clean and pure music without any distortion.

None that I have seen so far.

Absolutely a wonderful power cord compare to the value. I have use them with my CD Player and Power Amp. And boy I was blown away with the soundstage. It has wonderful vocal, mids are much more highlighted then before and the overall increase of details. My system now is very warm and liquid. Me myself never believe that Power Cord or in that matter any cable will change the sound, but believe me now I do believe in cable makes a lot of difference to a system. Bass is wonderfully balance and tight and extended. You have to have it to believe. Good power cords are usually expansive, but this one has a reasonable price tag and it is a very good value for the money and definitely a good investment in your audio system.

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Nordust, Analysis Plus.

In reading my previous review on the HT Pro-AC11 I made a mistake. The rating should be 5 overall.

Reduces grain in the sound, blacker background, true timbre of instruments and voices emerge.

none

I bought the HT Pro-AC11 Power Cords because I had read the reviews here and elsewhere about the sonic benefits of upgrading the power cords. I was skeptical at first. I first tried one with my newly purchased Pathos Classic One amplifier. I had really liked the sound before, but upon plugging it in, I noticed an immediate clarity emerge at all frequencies, with the outline of the various instruments and voices clearer, and the sound appeared "cleaned" of grainy sound, which I had not noticed before. Also, bass extension and definition improved. Then I purchased another unit and hooked up to the CAL CL-15 CD player. I once again noticed a further reduction in grain in the sound. Now the timbre of the piano, violins, and voices seemed entirely true.There was more detail, blacker background. Previously, I had kept the tweeter adjustment on my Revel M20s at -.5 db because these speakers have a forward presence. With the new AC cords, I have the adjustment at 0, with the result that the sound is totally natural. I feel that I have now totally optimized the system. I am sure there are better cords out there, but these are a great starting point, and are keepers for me.

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Stock power cords

great bargain buy

a little rigid

I am using 5 of these in conjunction w/ highwire power wraps. I think bpt power conditioner, acme audio cryo treated outlet will do more wonders than the AC cord. As cords are system dependent, your mileage may vary. The AC11 is highly recommended, increasing detail in my soundstage. MY HT: http://www.geocities.com/chinje2000/ht.htm

Price value, treble and bass extension, soundstage, dynamics.

none

Hi all, first of all I HAVE used this cord and I DID hear a significant improvement on MY system. Having it connected on my Krell integrated the improvement over the stock cord was significant in terms of a wider soundstage, better frequency extension at both ends and better dynamics. On “my system” it was much more of an improvement on the Krell than on the CD Transport. For the price I paid for it I think it was well worth it. Just a couple of my thoughts after my brief impressions on the Pro AC-11: These particular tweaks (i.e. interconnects, speaker cables and power cords) in audio as most of you may know, are very system dependent. On some systems (after the proper break-in time passes) they might do wonders and on others not as much. They also can be used as tone controls to tame brightness on some systems and increase details on others. What I am trying to say here is that the bottom line is, cables DO make a difference whether purchased pre-made or (much cheaper) made as a Do It Yourself project (CAT5). In some cases (as in mine) they make so much of a difference in particular systems that it seems as if an actual component (amp, CD, etc.) was upgraded and therefore even possibly saving you some money from having to upgrade that particular piece of audio gear. It’s just a mater of tries and time before you can find the proper cable that matches best for your own system. IMHO all the technical explanations from some skeptics about how a power cord (and all cables for that matter) will not work because of such and such factors... well all I can say is, “don’t knock it till you’ve tried it”. Why it works? WHO CARES? It just does! All the theories in the world won’t change the fact that in MY system the sound with this cord improved SIGNIFICANTLY. Believe me I am not dumb for anybody especially for some “audio hype” to fool me. I have 2 ears and I can judge for myself, as I did. Again, in my own honest opinion, cables, even aftermarket power cords DO make a difference! (Now having said that, that also doesn’t mean I would be spending an “outrageous” amount of money on them either). But don’t take my word for it (or listen to the skeptics), give this or any other cord a listen for yourselves and you can be the judges, trust your own ears! Highly recommending this product. Enjoy life and the music!

flexible for an 11 AWG cable

none for the price

Objectivists, listen up! Okay...it doesn't make sense that an aftermarket power cord can improve the sound from audio equipment. After all, we're not talking about interconnects that carry music but a cord that transmits raw AC power from point "a" (the wall outlet) to point "b" (the audio component). And once it enters the gear it's converted to DC, anyway. Furthermore, the miles of overhead wire between the substation & your home acts as an antenna that picks up RF, not to mention the homes, businesses, etc., adding noise to the AC grid. Therefore, an aftermarket cord can do nothing to IMPROVE the quality of the AC as it travels 6' from the wall to your gear. At best, all it can do is to prevent it from getting worse. Right? Wrong! I too was skeptical about any benefit an aftermarket power cord could bring to audio gear, but after reading + reviews on the Harmonic Technology Pro-AC11 I thought to give it a try. If it didn't work I'd just sell it (and while opening the box I was already thinking about the wording for my "for sale" ad). But once connected there WAS an improvement.Using the AC11 power cord for cd player didn't produce as significant an improvement as I encountered when switching to Cardas Golden Cross interconnects & Cross speak cables. But it was definitely worth the money. Hooked up to my cd the AC11 produced a sound that had noticeably less grain. So I bought 3 more AC11 cords for amp, preamp, and PS Audio P300. The three additional AC11 cords produced a further reduction of grain along with tighter bass. Out of curiosity, a few weeks later I then switched back to the 14 AWG stock power cords that came with the gear to hear what type of degradation in sound may result. I was expecting to hear a moderate increase in grain to the sound. But what I instead heard was a SIGNIFICANT increase in grain. Also, the noise floor was noticeably higher and the bass was loose, lacked pitch, and the music was far less involving with the stock AC cords. (All AC electrical connections were treated with Caig's ProGold.) The improvements brought by the Pro-AC11 power cords are clear and obvious with my equipment.

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PS Audio Mini Lab

Less grain & tighter, deeper bass

somewhat loose fit at the IEC end

Okay...while there''s a potential for improvement in sound by upgrading interconnects or speaker cable, there''s absolutely no reason to expect an improvement by upgrding a power cord. After all, cables & interconnects transmit a low-voltage signal carrying music while a power cord just moves only raw AC, which will be converted into DC anyway once it enters into a component. Furthermore, it''s impossible for 6 feet of wire carrying AC power to "imporve" the quality of the AC power. After traveling through miles of overhead wires that act as antenna (picking up RF), not to mention other types of noise inserted into the grid by homes, businesses, apartment rooms, etc., what can 6 feet of "high quality" wire to do to "improve" the sound? At best, all it could do is prevent the quality of the AC from getting worse. It CANNOT improve it. Right? Wrong. I didn''t expect to hear an improvement from my Pro AC-11 power cord, and was already thinking about selling it online as I was opening up the box. But once hooked up (to my cd player) I heard a significant improvement. It wasn''t as big an improvement as changing to my Cardas cables/intercoonnects, but it was well worth the money. There was less grain to the sound and bass was slightly deeper and much tighter. Noise floor was lower and the music was more involving. My only complaint was with the single crystal IEC, the fit was somewhat loose on the the cd player''s recepticle (whereas the original 14 AWG fit tight). Hence the reason for 4 stars, otherwise 5. I sent it back to H.T. and they are correcting the problem. So don''t take seriously the previous post from someone who talks a lot but never used the product. Try it yourself.

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PS Audio Mini Lab

Looks impressive.

Can only worsen sound quality.

Some people spend so much on their system that when they keep on spending, they actually make the sound WORSE. Power cords are a perfect example. Bryston says it best: “Thanks for your interesting inquiry re power cords. I can answer fully with normal engineering considerations and simple iinformation: There are likely to be 50 miles of cable and half a dozen or more transformers between you and the power plant generating the power that your sound system uses. It is unlikely, to say the least, that a power cord occupying the final six feet of that 50 miles can do anything positive to change the conditions of that power. It is possible to do damage to power delivery of course, by restricting current flow for instance. That would be the case if you had a cord which was too thin for the power needs, for example. If the power cord was much larger than necessary, however, it would unfortunately be limited by outside factors, such as the size of the wiring in your walls, or outside your house. It is also possible for a power cord to incorporate bandwidth-limiting components, to restrict the influx of RF or other contaminants to the 60Hz waveform. It is not possible, unfortunately, to do this without restricting the flow of 60Hz current to some degree as well. Most audio products, especially including Bryston audio components, contain internal circuitry designed to eliminate these contaminants within the power supply. They are designed to operate from an unrestricted source of 60Hz current, and will actually work less well if the current is restricted from the outside. In sum, it is certainly possible for a six-foot power cord to have an affect on the sound, and to change the sonic quality, for the worse. It is not possible, unfortunately, for this change to be an improvement, at least in connection with Bryston products. Bryston recommends that the customer do careful listening prior to spending what is usually a very substantial amount of money on exotic power cords. Remember that it is in the cord vendor''s direct financial interest to proclaim an improvement in sound quality for their products, and that any change is not necessarily a desirable one.” The typical 60Hz AC waveform contains approximately 3% distortion. Bryston''s power supplies filter out this distortion and noise with a typical efficiency of 99.999%.

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Absolute power cord.

Brings out the details!

Really stiff

I recently added one of the Pro-AC11''s to my system and there was an immediate boost in the details, depth, and image of the sound. I tried moving the cable around amongst the various components and found the most significant improvement when plugged into the CD player. The Wireworld Stratus was an improvement over the stock cord, but the Pro-AC11 was an even larger improvement. Takes a little breaking in as it can be a bit bright for the first day or two. Try one out if you are looking for a good tweak. Another cheap tweak is to add a "Hubbel" hospital grade AC outlet. Noticeably boosts details and volume, giving a fuller sound. Available through mail-order at: http://www.uhfmag.com/AC.html Associated equipment: Rega Planet 2000 CD Linar Preamp 2 Linar 250 Power Amp Sonus Faber Grand Piano Home Speakers Harmonic Tech Truth-link Interconnects Harmonic Tech Pro-11 Speaker Cables

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Wireworld Stratus

Fast detailed sound

Cord is alittle stiff

My Sony SCD-777ES sounds super great with the Pro-AC11 attached. Fast detailed sound with tight bass extension. Now I have to decide on interconnects from Harmonic Technology. Will it be the Truth-Link or Pro Silway MKII?

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Cardas Twinlink