Austin Custom Brass

ACB Custom Reserve Trumpet Mouthpieces: The Next Generation!

(16 reviews) Write a Review
1.00 LBS
Free Shipping
On Sale
  • ACB Custom Reserve Trumpet Mouthpieces: The Next Generation!
  • ACB Custom Reserve Trumpet Mouthpieces: The Next Generation!
  • ACB Custom Reserve Trumpet Mouthpieces: The Next Generation!
  • ACB Custom Reserve Trumpet Mouthpieces: The Next Generation!
  • ACB Custom Reserve Trumpet Mouthpieces: The Next Generation!
  • ACB Custom Reserve Trumpet Mouthpieces: The Next Generation!
MSRP: $329.99
Now: $279.00
Was: $329.99
— You save $50.99






These Custom Reserve pieces are the next step in our development as a company here at ACB. They have taken a few years from concept to initial designs, to working prototypes, to this final project, and we are so excited to share these with you! 


There are a couple of big points to differentiate the Custom Reserve line from our standard series:


  1. The O is underlined in the name for a reason: the Custom Reserve line feels incredibly open. These are designed to be played with a full air stream and as little body tension as possible. We do have a few videos to share with everyone who purchases a CR line mouthpiece to help in the acclimation process. Some will find it instantly easy to go from a standard series piece to the CR line, but even I found it a bit of an adjustment that is 100% worth the effort! The commercial pieces especially are a huge step ahead as they have such a full and rich sound while still maintaining tremendous efficiency. 
  2. The Custom Reserve mouthpieces only come in this exclusive blank and only in brushed gold plate. We could potentially do a silver plated piece on request, but no blank substitutions. This external blank profile design is absolutely paramount to all the of the elements that make these pieces so unique. We will not be offering the Custom Reserve in acrylic or delrin at the moment due to the internal specs being too crucial to the playability of the CR line. We are working on an acrylic rim solution but still have not been happy with the results in prototyping.  
  3. There are no alterations on these pieces because of their design. We can customize a standard series line mouthpiece if needed, but the CR pieces each have very specialized rim, cup, throat, throat length, backbore taper, and other dimensions to optimize them fully. We have spent the time really fine-tuning these!


Here's a quick comparison of the ACB 3C  versus the new CR 3+ (please note I don't normally play this size but had both available at the home studio for a video):


Here's a sneak peek into the TA1L+

View this post on Instagram

A post shared by Trent Austin (@austincustombrass)

Custom Reserve Mouthpiece Sizes:

The sizes in the Custom Reserve line are also a bit limited, based on over a decade of the most popular models we sell at ACB. Other cups can potentially be ordered but will be a 12-14 week wait most likely.

While totally revised, there are some relative comparisons between our Standard Series line and these Custom Reserve mouthpieces. If you are familiar with the rims in our Standard Series, each of these below they will feel similar on the embouchure.   More detailed videos and technical  information coming shortly. 



            ACB CR 1+ (This piece is modeled after our 0C  or PAPA  BEAR in the standard series)   

.684 ID  1.070 OD


  • ACB CR 1.25+ (This piece is modeled after our 1.25CS in the standard series)   

ID .671  OD  1.068 


  • ACB CR 2+ (This piece is modeled after our MV3C in the standard series) 

ID  .664  OD  1.072

  • ACB CR 2D+ (This piece is modeled after our TA2 in the standard series) 

 ID  .664  OD  1.072

  • ACB CR 3B+ (This is a completely new design based on a deeper version of our 3+ with a more B hybrid cup shape)

  ID .653 OD 1.066

  • ACB CR 3+ (This piece is modeled after our 3C in the standard series please check out the comparison video above!)  

ID .653 OD 1.066  

  • ACB CR 4+ (This piece is modeled after our 3CS in the standard series)

 ID .650 OD 1.066

  • ACB CR TA1+ (This piece is modeled after our TA1 in the standard series)  

ID .639 OD 1.084

  • ACB CR TAL+ (This piece is modeled after our TA1L2 in the standard series) 

ID .639 OD 1.084

  • ACB CR TAZ+ (This piece is modeled after our TAZ in the standard series)  

ID .625 OD 1.076

  • ACB CR L1.25+ (This piece is modeled after our Lead 1.25 in the standard series) 

ID .627 OD 1.056

  • ACB CR L3+ (Designed for Shop Manager Kyle Lambert this piece is completely new for this line only!)   

ID .628 OD 1.079



Questions about sizes? Check out this reference guide: 

View this post on Instagram

A post shared by Trent Austin (@austincustombrass)

Free US Shipping on all pre-orders!


If you have additional questions, please send us an email!  

Prior to ordering please check our Shipping and Returns policy.

Also note weight indicated in the ad is shipping weight not actual weight of the items.


View AllClose

16 Reviews

  • 5
    4+ & L3+

    Posted by Alex on 17th Oct 2023

    I bought both the 4+ and the L3+ to replace the 5CS and Lead 1 I have and I couldn't be happier with the results. Super efficient and easy to play. The richness in tone and sound compared to the standard series I came from is insane. I was able to actually pick up the L3+ and play it on a gig 30 minutes later with no issues. Love these mouthpieces and love this company! Acbassador for life!

  • 5
    CR 2D+

    Posted by G. Kaltenbach on 4th Aug 2023

    This is the best sounding mouthpiece I have ever played, and I would whole-heartedly recommend it.

  • 5
    CR TA-1+

    Posted by Kevin Ralston on 2nd Jun 2023

    I've had the CR TA-1+ for a couple of days now. As far as an acclimation period to get used to the open throat - I haven't had any problem. It plays beautiful. Been using a M. Unity as my go-to which is rather open throat so that may be why I haven't needed time to get used to it. The ACB CR is more so and I find it very expressive and can get good ring or good mellow easily. Loving' it.

  • 5
    ACB Custom Reserve Mouthpice

    Posted by Dave Dubinsky on 9th Apr 2023

    I’ve now been playing on my ACB CR L3+ mouthpiece for roughly four months, and love the full, rich, centered tone quality achieved, throughout 3 full octaves, while providing ease of flexibility, on demand. I just ordered and received a second CR L3+, to serve as a back-up, if I ever need it. Excellent design, appearance and functionality! Thank you, Trent and ACB R&D!

  • 5
    Custom reserve 4+

    Posted by Conal on 22nd Mar 2023

    I’m very pleased with the sound I am already getting from this new mouthpiece. Altogether refined than my previous mouthpiece I think. I have lost a bit of range but I think this will improve as I acclimate and I’ve abandoned my old piece altogether now in favour of better sound and intonation. It’s extremely comfortable and hence endurance is no problem even if surmounting some of the usual breaks is currently a bit challenging.

  • 5
    Austin Custom Reserve Mouthpieces

    Posted by Dave Dubinsky on 11th Feb 2023

    I’m not a mp hawk, hound or collector. I had been using my Schilke Tpt mp for about 25 yrs. However, being a very satisfied, loyal ambassador, of ACB, I was tempted to purchase a mp from ACB’s new Custom Reserve line. Well, as I anticipated, there was going to be an adjustment period; a time for my decades old embouchure to adapt to the new mp. Now, 3-4 months later, I’m so g as opt that I made this change. My sound is more open, in all registers, and I find it easier to reach into the high register. So, today, I’m going to purchase a second Austin Custom Reserve mp. After all, I don’t want #1 to be lonely! Incidentally, I’m playing on the L3+.

  • 5
    Custom reserve mouthpiece

    Posted by Russell Ryan on 12th Jan 2023

    Absolutely love the my new custom reserve mouthpiece! I thought it would take an adjustment period to play this mouthpiece, but from day one it felt great! Completely opened up my sound and a month later it just keeps getting better!! Kudos to Trent and his wonderful staff! Keep up the great work!!

  • 5
    ACB Custom Reserve Trumpet Mouthpiece

    Posted by Jordan Ashby on 5th Jan 2023

    This has got to be one of the best mouthpieces I've ever had the privilege to perform with. I bought the 2+ model as I normally play on a 1.5C. This piece has got the richness in tone that I wanted, but also makes it more efficient for upper register playing due to the shortened length in the throat. This is a great all around piece to play on!

  • 5
    Custom reserve

    Posted by Brian Kuszyk on 28th Dec 2022

    This is really a special mouthpiece. Trent has somehow made this one of the best and most efficient mouthpieces I have ever played. Just made it through 26 Nutcrackers and loved it. I love the balance between the smaller cup, large throat and awesome backbore. Well done!!

View AllClose