Austin Custom Brass Trumpet Backbores

$95.00 $75.00 (You save $20.00)
Weight 1.00 LBS
Height 5.00 (in)
Width 5.00 (in)
Depth 5.00 (in)
Shipping $3.00
weight Required

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Austin Custom Brass Backbores


ACB backbores are now in stock!

All ACB  tops and Backbores utilize the now universally accepted "Warburton"  threads,  making them compatible with almost every other maker's  modular components!


I've been working on a new design for the trumpet backbore line to make them as acoustically  efficient as possible.   Currently I have 7 different tapers available:


T:  Tight:  commercial backbore which provides the most resistance and "zing"  to your sound

MT:  Medium Tight:   Provides great resistance, especially for players who tend to "back-up"  with very tight commercial backbores.

S:  Standard:   Provides the best balance between resistance and sound spread for most players. 

MO:  Medium Open: A great slightly open symphonic shape produces a rich,  warm tone but still gives ample resistance when needed.  

O:   Open:   This is a very large, open backbore designed for the orchestral musician to provide the feel and sound spread that most orchestral players prefer


Also I have two special  sized backbores that are different than the "standard" line:


A1:  This backbore is a very large, symphonic backbore that is in between the MO and O  but feels like it combines both feel and sound shapes from the two other shapes.  It's  a wonderful backbore suited for the classical player or jazz soloist wishing for a large sound!


A2: The A2 is a weapon!  Designed to be mated with extreme compression mouthpieces,  this might be the ultimate commercial backbore I've played.  It works great above high C and mates with 27, and 28 tops extremely well!



Finally, we do have 2 specially designed short-shanked C trumpet backbores!

AOS: Designed for C trumpet players looking for a large and warm sound, it's open and free-blowing. It provides a feel and sound spread that is perfect for orchestral playing and for chamber music.

AK: This backbore is a very large, symphonic backbore that is based on some of the best of Tottle designs. Used by orchestral players for decades (and very popular at one time in the BSO) the AK is an open backbore with a huge sound! 



All backbores will be made with a #27 (.144)  throat.   



For Gold plate add $30 and 3-4 weeks for delivery.

Product Reviews

Score: 5 out of 5 (based on 9 ratings)
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Great backbores
Written by J on 28th Sep 2018

ACB rocks! MO and O backbores shipped the next day!

Review of backbores
Written by Murray Gordon on 16th Sep 2018

Perfectly made and outstanding!

All you need is there (S backbore)
Written by Mark on 13th Sep 2018

I am very happy with my purchase. It had all the qualities that I wanted in sound and ease of playing :)

Heavy Tight Backbore
Written by Harrison on 24th Aug 2018

I wanted a heavier mouthpiece so more sound transferred into the horn and a lead mouthpiece because I play quite a bit in the upper register, Double A on a regular basis. This piece plays crisp, notes are well defines, and I cut through a 25 piece brass group that plays loud. It's a keeper!

Written by Blaine on 2nd Dec 2017

Fantastic quality and Trent provides a great description of each. I have the MO and S backbores that I pair with an MV3C and MV3L. I have an MT on the way as well. I like to experiment swapping them around for different sounds I like. I have used another brand of two piece system in the past and I prefer these backbores by far. Simple sub set of options to pick from depending on what you want, no guessing between a 3-4 like you have to with competing brands. I think this is huge when making an online purchase when you can’t test before buying.

Written by Juha on 13th Jan 2017

Slug backbore great all-round backbore for me.And works great acrylic tops

great backbore
Written by kevin s on 5th Jul 2016

I had trouble with my old mouthpieces, partly because the backbores were so restrictive. Trent paired his new Gen II 3S top with the T backbore and I've got a winner,

best backbores around
Written by E Bone on 30th Jun 2016

I've always had a hard time with backbores from other manufacturers. With ACB backbores, however, they just seem to work great for me. Perfect balance of resistance and color. Thanks Trent!

ACB mouthpiece system the best ever
Written by Bill Mirrielees on 25th Aug 2015

Just got finally dialed in with the perfect mouthpiece combination of top, blank and backbore for my A4. Fabulous!