David B Submitted: 2018.11.15

Just letting you know that the speaker cables have arrived (SP4s with 2 day burn in).

I installed them last night and had a quick listen.

I know it¹s early stages yet, but I certainly agree with the vast majority of descriptions from your happy customers. Detail, imaging, and musicality are all very impressive. The cables have made quite a substantial positive change to my system.

I¹m very happy with the SP4s; and I am looking forward to the MA4s arriving too.

I will send you a more detailed feedback/review once all the cables have settled into my system.

All the best and thanks for making a great product.

I would highly recommend these cables to anyone.

Kind regards,

David B

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Joseph B Submitted: 2018.01.22

Hello Mike,

Just a quick note to let you know that I'm sending my SP2 cables via USPS Priority mail today to fulfill my trade-up obligations for my SP4s. All I can say is…wow. The sound is so natural and engaging. At the moment I'm listening to a Jane Monheit recording. I can't recall ever being so drawn into her vocals. Thanks again for exceeding my expectations.

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Donald P Submitted: 2017.10.20

HI MIKE OMG!!!! THE cables aren’t even broken in but it sounds like I got a new subwoofer, new speakers and a new amp. It also sounds like there are no cables at all. I cant imagine what they will sound like when broken in because they are already amazing.


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Michael B Submitted: 2017.05.19

I’ve just received a new pair of your SP4 speaker cables; I’m surprised and very impressed.

When I first read about your product I was interested and skeptical. In a previous life I designed specialty interconnects and cables and the fact that you use small gauge solid core wire is what first got my attention. I first tried your SP2 cables and MA2 interconnects. I didn’t expect much, maybe a slight change. I was impressed with the interconnects, so I bought another pair of the MA4 interconnects, then another pair. Now I've replaced my SP2 cables with SP4’s. After so many years of reading marketing BS I finally found an audio cable product that matches the marketing. Your product is the best sounding cable I’ve encountered. I’ve had many brands of cables; yours truly provide a dramatic, positive difference to my hobby.

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Thomas J Submitted: 2016.08.09

Hello Mike, the SP4's speaker wire are doing great. They made my system sound a little fuller and it seems like the volume has increased. They do bring out every note in the music. they sound good. I feel I made a good choice. I am very happy with these. Thank you for working with me on getting the right cables for my system. thank you !!

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Gary Lewis Submitted: 2016.05.06


Your RF4 speaker cables are outstanding! Sorry, I don't believe in the excessive break-in for cables. Everything I've read, heard, and experienced does not confirm this need. I did only a few hours burn-in when I would be outside and maybe listened to 10-15 hours within the first two weeks. But, even when I ordered them, I really didn't expect them to make any difference in my system. After the first listening, I knew I was wrong; the RF4's were very good but so were my old cables.

After two weeks, I re-connected my old cables and I was taken back by the difference. My old ones were awful. There must be something to magnetic interaction with non-insulated stranded wire cable that did produce noise or cancellations that I couldn't hear. My first impression was what I wrote earlier-I could hear more depth, especially in the decay of sound, and more pianissimo's as well as the inside instruments in an orchestra.

I've taught music courses in performance, theory, and history in higher education for 50 years and have had a passionate interest in the accurate reproduction of music. I often listen with a score in hand. Unfortunately, it's almost impossible now for me to listen to music without being hyper-critical. It's a curse; background music is just annoying clutter.

Thus, from the few hours that I've listened through you cables, I've done so with a fair amount of critical or objective listening. I was even listening with some unbelieving negativity. It would have been cheaper to return them than to keep-but I couldn't. By far, these cables made a significantly sufficient improvement in my system to justify the expense. In a word, they were outstanding! Thank you for the opportunity to listen through them as well as to allow a little time to overcome my skepticism!

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"My Morrow Audio SP4 reference speaker cables demonstrate not only genuine quality and value, they are also stunning sonically. My system has definitely hit new levels of coherency and realism."

UPDATE: I have since been optimizing my system and thought I would send you a few pics in the event you would like to augment my comments with photos for your site. I assume it might help enhance your site as you build up positive feedback and allow "browsers" to see the actual real-world systems within which your cables have been installed.

I continue to be delighted by the SP4 cables and look forward to many hours of audio bliss as they continue to break-in and smooth out even further.

Kind regards, -Todd

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Got home last night from camping and had to check on the SP4 since I had left the system running while we were gone. Somewhere between 200 and 300 hours they transform and are much better than the SP3. I think the SP4 is better out of the box than the broken in SP3 and a broken in SP4 may be another 50% or more better than the SP3. The instruments are bigger and more in focus. Easier to place the performers and are more life sized. Incredible imaging. As good as the SP3 is, I am shocked by the precision of the SP4.


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Before this adventure with Morrow Audio, I had never heard speaker cables make such a difference. ICs, yes; PCs, yes; but not speaker cables. Your work, Mike, makes speaker cables vital, absolutely vital to the experience of listening to recorded music.

These SP4s are very detailed and revelatory, very realistic in presentation, and very, very musical. The placement of voices and instrumentation is "visually" very accurate, but not sharp and intrusive and distracting. The space around the voices and instruments is wonderful. Nice work!

UPDATE: I am just stunned... I've been working on my student's written work all day, listening to whatever the computer queues up in its playback through the DAC. So often this morning and early afternoon, I've heard jaw-dropping detail and musicality in a remarkable balance.

Just a few moments ago, I heard the palm on the drumhead... never heard that before in that particular bit of music. Literally, the musical sound-texture of a human hand on the drumhead leather... I've heard that detail before, but not to the palpable complexity of texture and detail, the contribution these make to the musical experience that the SP4s bring.

Oh well, you must get tired of these rants and ravings from others and me about these cables. I bet sometimes you want to make a cable that shuts us up, renders us mute (as Medusa turned warriors to stone) (as Odysseus must have been, listening to the Sirens... no more banal blabbing, just all ear), giving you some space to do your work!

UPDATE 2: Well, it's just amazing to listen to this system, which I know inside and out, over all kinds of music and types of instrumentation, some quite exotic by western standards, and to be surprised and literally awed.

Today I heard a vocalist, Hamza el Din, in the audio space created by the SP4s & MA4's. This came in a way I've never heard him before.

Literally, my experience was as if he were in my listening room singing and playing... the sense of voice and space, a human presence, Hamza el Din! Sadly, he has passed away. My experience this afternoon was as if he returned to sing and play in my listening room. Now this, especially while I was working, I have never, ever experienced in audio. It was very much like a front row experience at a small, intimate concert. Such things are just very, very unusual in my world.

:) Ed

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"I've had the SP4 speaker cables for a little while now and I am hugely impressed. My previous setup was all tubes with anticable and the sound was just great with lots of presence and very palpable. Needing more power, I then went with all solid state. It was great but the sound didn't have that palpable feeling or presence I'd become accustomed to. Well, swapping in the SP4s changed all that and more. Wonderful cables Mike, I hope others give these a trial. Thanks Brett"

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Hey Mike - got those SP4 speaker cables yesterday; I'd never had cables that cost that much before, and I wasn't sure what to expect, but yeah, those are impressive - they make a MUCH bigger difference than I would have imagined. And they're supposed to keep getting BETTER over the next hundred or so hours, even though they've been through the break-in machine? Lucky me! Thanks, Larry.

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Dmitri Kochtcheev

Mike, First off i would like to say thank you for your cables and for the excitement you brought to my music listening. Unlike most of your customers, i can't really compare your products to the others as i just bought my first hi end system. For whatever reason, i just liked your site, your personality and your videos which make a lot of sense. I decided to give it a shot and i did a right choice. I am very very happy with the results. Great detail, very realistic, "fair" sound. My Classe and B&Ws love your MA4 and SP4s Thank you, Dmitri Kochtcheev

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"Mike, I have never taken the time to provide written feedback to anyone about any audio components I have purchased and placed in my system. However, I'm compelled to make my experience with Morrow Audio cables the exception.

I just replaced Kimber Kable Silver Streaks, Kimber Kable 8TC's and Nordost Frey's with your Morrow cables, specifically the MA3, MA4 and SP4's.

I'm not an audio expert and won't try to imitate one, however I know what significant changes I have heard in my system since installing your cables.

I'm experiencing a realism that I was missing. The sound stage is much larger and more open. Detail is better than ever and the sound is extremely clean, clear and concise. Importantly, it is neutral and not tainted. The dynamics are not over exaggerated but tight and clean. I feel like I'm hearing what the artists intended in their music presentation. In the world of audio you don't know what your missing until you hear what you were missing.

Please feel free to share this with your customers or anyone who might be in the market for cables. Your cables really do make a difference. WOW!" Kevin

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I am REALLY impressed with the level of detail these provide. Case in point playing Jim Messina's newer CD "Under a Mojito Moon", I am now CLEARLY hearing back round percussion instruments at a level of clarity that were simply not there before (smeared). I also thought psycho-acoustically I was hearing mild distortion thru a right channel midrange, after replay it happed to be the reverberation of an ending note of an acoustic guitar string inside the body of the instrument, which blew me away. Sound stage improved dramatically and bass is a little better defined. After the dips of further break in are completed I'm sure I'm going to be in for a good ride. Jay

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Giancarlo Fabbri

For a long time I followed the discussions on the Americans audiophile forums about the Morrow cables, I was surprised how virtually all people who had purchased becaue, focusing especially on their value for money. After reading other favorable reviews on the cables Morrow and moved by curiosity I decided to buy the MA1 interconnect cable also saw the discounted price.

I connected the MA1 between the CD player and the pre (replacing a quadruple price cable MIT). The cable was new and needed a right break-in but the sonic character after a couple of days it soon became clear.

The first impression was that of transparency, fluidity and extension of the extremes of the sonic range and this was only the beginning ! More the MA1 sounds more sounds better, the virtual window of the soundstage is recreated now sharper, wider, more real and the "live" effect much more pronounced.

The American audiophiles of the various forums were right, the Morrow cables have an intrinsic value much higher than the price paid and in comparison to high-end cables much more famous (and much more expensive) of international level.

My experience with the Morrow cables has continued with buying 2 +2 mt of the SP4 speakers cable in bi-wired version. No surprise there ! The SP4 sounds (or not sounds) exactly as I imagined: neutral , transparent, tonally very correct and sizing, how properly should be, the instruments and the soundstage recreated. The sonic window is filled with new nuances now, sounds never heard before or never perceived before. I think that there aren't many comparisons in terms of musicality with these SP4 and other cables of the same price (and even much more). These cables are so transparent to highlight the negativity of everything which stands upstream of the audio system where they are connected.

Personally, I have always been convinced of the sonic superiority of the solid core cables compared to stranded wires and Morrow cables are a prime example. After thirty years of audiophile listenings and looking for the " right cable ," I consider the SP4 a definitive cable in the context of high-end cables with a cost still human and the bi-wired version further enhances the sonic characteristics of transparency, realism and fluidity of the sound message.

In the future, my experience with Mike Morrow will continue (finances permitting) with MA5 interconnects, replacing the MA1 between CD Player and pre and another pair of MA5 between preamp and power amp. I'm already foretasting the final effect ... Pink Floyd here, in my living room playing here three meters from my listening chair. Thanks Mike!

Best Regards. Giancarlo Fabbri Urbino (Italy)

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Solid Core: Using solid core wire removes the stranding distortion found in stranded wire designs. This eliminates the smearing effect, allowing much more information to pass through.

Small Gauge: Using a proprietary small gauge wire removes the skin effect distortions that are unavoidable in larger gauge construction. You will hear things in your music that you never heard before.

Individually Insulated: Insulating each strand of wire individually allows the signal to flow unhindered instead of jumping from strand to strand. Great detail in your music is achieved. The emotion of the music comes through.