# Headphone Amplifier Mackie HM-400 Black — 6.3 mm output, THD 0.01%, SNR -66 dB, 100–120 V AC

**URL:** https://aio.lv/en/product--mackie-4132828--12087264
**Data updated:** 2026-03-13 08:59 (EET)
**Category:** AV Receivers & Amplifiers
**Manufacturer:** Mackie
**Manufacturer code:** 4132828
**EAN:** 663961054088
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 184.49 €
**Prices and availability valid until:** 2026-07-14 23:59
**Price without VAT (21%):** 152.47 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--mackie-4132828--12087264

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 03.07.2026 | free |
| Pickup points | 08.07.2026 | 1.99 EUR |
| Courier delivery to door | 08.07.2026 | 4.99 EUR |

## Summary description

The Mackie HM-400 Black is a rackmount headphone amplifier designed for monitoring and distribution in studios and live sound environments. It features a 6.3 mm headphone output, 20 kΩ input impedance, low harmonic distortion (THD 0.01%) and a signal-to-noise ratio of −66 dB. Powered from 100–120 V AC (50–60 Hz), the unit measures 483 × 224 × 46 mm and includes an AC power cable. Suitable for multi-listener monitoring and integration into PA or studio racks.

## Long description

The Mackie HM-400 Black is a rackmount headphone amplifier designed for monitoring and distribution in studio and live sound environments. With a single 6.3 mm output and a compact 19" rack form factor, the HM-400 provides low harmonic distortion and consistent performance for multi-listener monitoring and cue mixes. The unit accepts mains power at 100–120 V AC (50–60 Hz) and ships with an AC power cable; its chassis dimensions are 483 × 224 × 46 mm, making it suitable for integration into standard equipment racks.
Advantages
The HM-400 delivers precise headphone output with THD as low as 0.01% and a signal-to-noise ratio of −66 dB, ensuring clean reproduction of audio material. Its 20 kΩ input impedance helps maintain signal integrity when connected to a variety of sources, while the rugged rackmount chassis and included power cable simplify installation and long-term use in studio or live environments.
Suitable for
 Headphone monitoring for recording and mixing sessions
 Cue mix distribution for performers and engineers
 Integration into PA or studio equipment racks
 Practice rooms and rehearsal spaces requiring a reliable headphone feed
Key specifications
 Output connector: 6.3 mm headphone jack
 Input impedance: 20 kΩ
 Total harmonic distortion (THD): 0.01%
 Signal-to-noise ratio (SNR): −66 dB
 Power: 100–120 V AC, 50–60 Hz
 Dimensions (W × D × H): 483 × 224 × 46 mm
 Rackmount: 19" chassis
How to use
Install the HM-400 into a standard 19" rack space and connect the AC power cable to a suitable 100–120 V AC outlet. Route the audio source to the amplifier inputs using appropriate cables and connect headphones to the 6.3 mm output. Adjust input and output levels on connected source devices to achieve the desired monitoring volume while avoiding clipping. Ensure proper ventilation around the chassis to maintain reliable operation during extended sessions.
Usage recommendations
For best results, use the HM-400 with headphones that have appropriate impedance for monitoring applications and keep source-level gain moderate to minimize noise and distortion. When integrating into a rack, secure the unit and allow airflow; periodically check cable connections and mains voltage compatibility to ensure stable performance.

## Specifications

| Feature | Value |
|---|---|
| Power source | AC |
| LED indicators | Switch, Status, Power |
| Gain | 18 dB |

### Outputs

| Feature | Value |
|---|---|
| Headphone connectivity | 6.3mm |

### Power

| Feature | Value |
|---|---|
| Power consumption (typical) | 24 W |
| AC input frequency | 50 - 60 |
| AC input voltage | 100 - 120 |

### Audio

| Feature | Value |
|---|---|
| Signal-to-Noise Ratio (SNR) | -66 dB |
| Total Harmonic Distortion (THD) | 0.01 % |
| Input impedance | 20000 Ω |
| Frequency range | 20 - 20000 |
| Output impedance | 47 |

### Weight & dimensions

| Feature | Value |
|---|---|
| Weight | 3.6 kg |
| Height | 46 mm |
| Width | 483 mm |
| Depth | 224 mm |

### Inputs

| Feature | Value |
|---|---|
| Audio (L/R) in | 12 |

### Packaging content

| Feature | Value |
|---|---|
| Cables included | AC |

### Technical details

| Feature | Value |
|---|---|
| Product colour | Black |

## FAQ

### How much does the Mackie HM-400 Headphone Amplifier cost, and is it available for purchase?

The price is 184.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 5 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 03.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay, Installment. All transactions are 100% secure and encrypted.

### Can Mackie HM-400 Headphone Amplifier be purchased with a lease?

Yes, the purchase is available both on credit and with an interest-free installment plan. Learn more about installments and credit options: https://aio.lv/en/payment#b3

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Mackie products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Mackie service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

### How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: weight, product colour, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

### Where can I download the instructions for Mackie HM-400 Headphone Amplifier?

You can download the instructions in PDF format from the “Instructions” section on the product description page. The file contains complete information about installation, setup, and usage.

## Image

https://aio.lv/img/cache/product/12087264/67570991_large.webp