Z40+ Integrated Amplifier Upgrade Program

LTA is proud to announce the next generation of our most powerful flagship integrated amp, the Z40+ Integrated Amplifier.

After trying over two dozen component combinations, and countless hours of listening tests and comparisons, the new Z40+ upgrade improves the tone and texture across all frequencies, and there is more detail and clarity around the performers.

These sonic upgrades are achieved through adding a massive 100,000µF of additional capacitor storage and changing resistors at key points in the audio path to non-magnetic Audio Note Tantalums, each value specifically chosen for their location.

Stereo subwoofer output has also been added. For those who prefer mono subwoofer output, that can be requested at no additional charge.

What’s Included in the Plus Upgrades

1. 100,000µF of additional capacitor storage

2. Audio Note resistors

3. Subwoofer Output (Stereo is standard. Mono available by request at no charge)

4. Updated Volume Control w/ Adjustable Gain & “Hi-Res” Settings

5. Custom LTA-branded remote control

Listening Notes from LTA’s Director of Sonic Quality

Yes, that is a real job title - some people have all the luck - and along with a cadre of test listeners, it’s their job to make sure the sound of the Reference+ upgrades keeps the LTA sound our customers love while raising the bar in the right areas.

Whether you are Sunday morning classical, late night jazz, or sweaty rock club listeners, everything comes out sounding sweet and immersive with the Plus version. There is tonal sheen, midrange elegance, and startling, controlled dynamics like never before. The Reference+ upgrades reveal more emotion in the music.

We’ve found that with the Plus update, listening fatigue is a footnote of the past, no matter the source. Even the most challenging torture tracks become immediately palatable and better yet, unskippable. When pushing to "live sound" decibels, instruments and vocals stay in place and simply get more vivid and real instead of breaking up or becoming shouty (suggesting the listener be more reasonable with the volume control.)

Whatever your preference, you'll find new appreciation for your all time favorites and fall in love with the latest new releases.

Note: The Reference+ Upgrade does not include the Mullard EL34 tube upgrade. You can purchase each of these separately at the Amp Upgrades page.

How It Works

1. Place your upgrade order

2. LTA will send you a return shipping label

3. Pack your amp securely in its original box and packaging (if you don’t have the original packaging, let us know), affix the label, and take it to your closest UPS/FedEx dropoff location

4. When we receive your amp, we’ll do the upgrades and ship it back to you ASAP after a full week of play-testing and burn-in. We will have your amp for about two weeks, give or take, once it’s received.

5. Enjoy!

Note that due to the additional components required, the Plus upgrades add two inches to the depth (front to back) of all units, making the depth 18” including connectors.