Dear colleagues, it is without any doubt one of the best CFM56 sound to PMDG 737 NGX, but until now, definitely, it is not the gold standard for B737. For me, right now, all the sound packages developed to P3DV4 should be compared to FSLabs A320. It is very hard to beat it. I will explain my point of view reporting the following pro and against facts:
PRO
1) the spool up sound is the best ever simulated to PMDG 737NGX
2) the wind sound is very well sampled at cruise level
3) the sound samples are well normalized, so you won´t explode your sound system
AGAINST
1) the sound in general at cruise level is not closest to the real thing. In 737 at cruise level there is more low frequency sound and we almost never hear the high pitch sound of engines! The real sound at the cruise level is almost a mix of low frequency rumble of the engines and wind sound. In this package we are hearing the high frequency of engines....That is definetely not real
2) It is very strange that seems to me that on this sound mix.....the low frequencies are not well represented. I miss a lot the absence of low frequencies.

CONCLUSION
It is the best sound for PMDG 737NGX, but I was expecting something more, mainly because it is a payware product. It might be due I have the FSLabs A320, which is the closest to the perfection in terms of sound to P3D. But I´m waiting for corrections on the sound mix to solve my questions. Thanks guys, good work!

Thanks guys

Highly recommended.

Compared software sounds to sounds of 737's online(YouTube, Boeing.com etc)videos and the similarity is amazing. Recent service pack includes APU sounds etc.

Product is worth the minimal investment.

Im a owner of both the cockpit and cfm audio packs and all I got to say is WOW - not just because of the immersive audio itself but the fact that this developer is a truly enthusiast who really takes the time to make perfection and to listen to his users. Im one of those picky customer who use a high end audio system for my flight simming aswell as for music and movies and I instantly had some feedback and contacted the developer and right after I written to him I got an answer and he got to work, improving his work of art - just to satisfy me as a customer. That is world class suport and heart that I think other developers should aim for!

I cant wait for this devs next piece of art - he makes it even funnier to flight sim!!

Thank you!

Love it! What an improvement over the stock PMDG engines and environment! Great job on this one. IF I had to be critical, I would have to say that, for the novice simmer, the install directions did not seem easy to understand, even incorrect. But as many simmers have made changes like this to their aircraft to improve sounds, etc., it wasn't difficult to figure out how and where to place the files and backup the old one. All-in-all, this one little addition has made a HUGE difference to my simming enjoyment! Thanks again & keep up the great work!!!

Great sound pack. Made a first flight today with these sound and really impressed. Recommend it to all 737 pilots.

Many thanks for this product. I would also rate it at three as the power of the CFM engines are not properly heard from the cockpit. Being a passenger 99% of the time I do appreciate more of the base sound, the cracking sound of the cabin, the hydraulic sounds of the flaps and also more louder wind when up at cruise level ... I do believe from a cockpit this might be all simulated perfectly right but still after waiting 20 years for a decent 737 sound set (since FS98) this is still not it :) Still thank you and keep rocking !!! You belong to the best.

Immersive audio always produce quality add-ons. I am very happy with the product considering this is only the first version and knowing and update is on the way. I have to agree with the previous reviewer a bit that the engines should be screaming on 95% thrust and the bass is barely noticeable. I also understand on different audio systems and settings this will sounds differently as well. In my case is 5.1 with a huge sub and if I remember correctly I have it set to 80Hz which is something to consider as well. Comparing this product to TSS sounds for the NGX (which I used until now) I think is a very good start but there's work to be done. Giving 5 stars for the initial release and waiting for an update which fixes the issues.

Unfortunately I can only give this three stars, I am a fan of other products like the cockpit sounds, it is a excellent product ! I travel 2-3 times a month mostly on 737s and there is a slight level of bass that is missing from this audio file. I have but kickers in stalls and they barely go off which is killing the immersion for me. Throttle set at 95% engine should be screaming and there is a presence of base which is missing in this product. The sound files for the most part all good but they sound a little flat. May have to return back to TSS

such a great product and support, highly recommended.

well, it took me some time to get it working, but I believe it was my fault, as a flight dispatcher I have being several times in the cockpit of a Boeing 737 NG the sounds as very accurate, as well with the support I got from Predrag Drobac to make it work I give this product and as well the Majestic Sound Pack 5 stars.

You did it again!After many years using the def pmdg sounds, it's high time that we use something fresh!Excellent rendition to the sim, well done Pedrag!

First time reviewing a product. I am a 737NG Fan and have been flying on simulators for over 15 years. These sounds produced from immersive Audio in my opinion are the best 737NG CFM engine sound packs to date! Youtube any 737NG video inside or outside and you will not come closer than Immersive audios CFM engine soundpack for the 737NG. Takeoffs sounds will give you a vibe as if you are moving something very heavy! Five stars without question. Immersive Audio development team great job! Keep this standard.

Excellent job by Immersion Audio. Only thing I would like to see is the same sounds being modified for use with the 600-700 series. Otherwise I'm very pleased with my purchase, highly recommended.

First off - I am a hobbyist. I work with music and therefor know my speakers and reference headphones very well. My complete audio chain is as short as possible to deliver the most accurate (flat) sound from whatever system I use.

Typically I am not a fan of modding an original product like the NGX. The stock sounds are already pretty good, I would say better than most 3rd party sounds. Prior to replacing any sounds, I subconsciously neglected to fly the NGX and always picked other aircraft. When trying to pin-point what made me do that, I found the stock sounds - especially in cruise - fatiguing to my ears.

The first replacement sounds I got were by TSS. While these sounds are high quality and I have nothing negative to say about them - they didn't "feel right" for the flight deck, but for improvement they were much easier on my ears.

With the 737NG CFM Immersion sounds Immersive Audio did a fantastic job in creating a sound environment, that I can imagine being present on the real aircraft. The first thing I was concerned about, was the return of those frequencies I mentioned earlier. I am very happy to report that those are not present at all.

The quality of audio is excellent and certainly fits the NGX simulation very well. At first I was a little mislead by the volume of the sounds through the promo video, but after a couple of flights it all seems very natural. That is what makes this package so good - it all feels very well tied in with the original product, the NGX goes hand in hand with the sounds.

One critical point I found was that the sounds behind the engines are super silent, which makes it almost feel a bit "unreal" when looking at the plane from a chase perspective or panning around it. Also the transition between the front and aft of the wing seems a bit too harsh for me.

Over all this is a solid add-on, that does what it's supposed to do, nothing more or less. With the price in consideration there's no other option than to fully recommend this product.

The Picasso of sounds has done it again and they keep outdoing them selves! ITS A MUST HAVE, ESSENTIAL to every NGX pilot

Amazing product for NGX!

Huge thanks to developers, who made this awesome SOUNDPACK!

Fly high!

Cheers, Vojtech

just great like always good job.......................................