# Headphone Amplifier Mackie HM-400 Black — THD 0.01%, SNR -66 dB, 6.3 mm output, AC 100–120 V, 483×224×46 mm

**URL:** https://aio.lv/en/product--mackie-4132828--11393208
**Data updated:** 2026-03-12 16:29 (EET)
**Category:** AV Receivers & Amplifiers
**Manufacturer:** Mackie
**Manufacturer code:** 4132828
**EAN:** 0663961054088
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 182.49 €
**Prices and availability valid until:** 2026-07-12 23:59
**Price without VAT (21%):** 150.82 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--mackie-4132828--11393208

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 25.06.2026 | free |
| Pickup points | 30.06.2026 | 1.99 EUR |
| Courier delivery to door | 30.06.2026 | 4.99 EUR |

## Summary description

Mackie HM-400 is a compact headphone amplifier designed for monitoring and mixing applications. It features 6.3 mm headphone connectivity, low total harmonic distortion (THD 0.01%) and a signal-to-noise ratio of -66 dB. Input impedance is 20 kΩ, powered from AC (100–120 V, 50–60 Hz). Dimensions 483×224×46 mm, weight 3.6 kg; AC cable included.

## Long description

The Mackie HM-400 Black headphone amplifier is a compact rackmount unit designed for monitoring and mixing applications. It provides a single 6.3 mm headphone output and is built to deliver low distortion and a clean signal path for reliable cueing and personal monitoring. The unit accepts AC mains power (100–120 V, 50–60 Hz) and is supplied with an AC cable. Its 19" rack width and shallow depth make it suitable for studio racks and small setups where consistent headphone distribution is required.
Advantages
The HM-400 offers low total harmonic distortion (THD 0.01%) and a measured signal-to-noise ratio of -66 dB, ensuring a clear and accurate listening reference. With a 20 kΩ input impedance and a standard 6.3 mm headphone output, the amplifier supports common professional headphones without introducing significant coloration. The compact footprint, 3.6 kg weight and included AC cable simplify installation in rack systems and mobile rigs.
Suitable for
 Home and project studio headphone monitoring
 Live sound cue mixes and band rehearsals
 Broadcast and podcast monitoring
 Education and practice rooms requiring reliable headphone distribution
Key specifications
 Output connector: 6.3 mm headphone jack
 Total harmonic distortion (THD): 0.01%
 Signal-to-noise ratio (SNR): -66 dB
 Input impedance: 20 kΩ
 Power supply: AC 100–120 V, 50–60 Hz (cable included)
 Dimensions (W×D×H): 483 × 224 × 46 mm
 Weight: 3.6 kg
 Colour: Black
How to use
Install the HM-400 into a 19" rack or place it on a flat surface with adequate ventilation. Connect the audio source to the amplifier's input using compatible cables and set headphone(s) into the 6.3 mm output. Power the unit from an appropriate AC mains supply (100–120 V, 50–60 Hz) using the supplied cable. Adjust the output level to a comfortable monitoring volume and verify signal quality before extended use.
Usage recommendations
For best results, use headphones with nominal impedances and sensitivities typical of studio models. Avoid extreme output level settings to prevent hearing damage and clipping. When integrating into a rack, leave space for airflow around the unit and route power and audio cables to minimise hum and interference.

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

The price is 182.49 € (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 25.06.2026 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 Headphone Amplifier Mackie HM-400 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 Headphone Amplifier Mackie HM-400?

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/11393208/66205374_large.webp