Best Interface Modules Under $100 2025

Affordable interface modules under $100 - great value without compromising quality

Last updated: November 5, 2025 • Next update: November 12, 2025

PRICE RANGES: Under $100 Under $200 Under $300 Under $500

SKILL LEVELS: For Beginner For Intermediate For Professional For Advanced

GENRES & STYLES: For System Integration For External Connections For Level Matching For Format Conversion For Studio Integration For Signal Routing

BRANDS: Intellijel Designs Expert Sleepers Doepfer Befaco ADDAC

Ritual Electronics Flexibilité - Professional Music Instrument Photo

⭐ 4.5/5 (31 reviews)

Sound:

6/10

Build:

7/10

Value:

8/10

Ritual Electronics Flexibilité

by Ritual Electronics

Format Conversion External Connections Level Matching

Key Feature:

• Essential for studio integration

✓ PROS

• Connect modular to external equipment
• Level and impedance matching

✗ CONS

• Additional cost for basic functionality
• Not directly creative or musical

Ritual Electronics FlexibilitéExpression pedal adapterOutputs unipolar (0 V to +5 V) or bipolar (-5V to +5V) control...

⭐ 4.5/5 (31 reviews)

Sound:

6/10

Build:

7/10

Value:

8/10

Art. 518305

$79

Buy at Thomann View Details

Intellijel Designs Stereo Line In 1U - Professional Music Instrument Photo

⭐ 4.7/5 (56 reviews)

Sound:

6/10

Build:

6/10

Value:

9/10

Intellijel Designs Stereo Line In 1U

by Intellijel Designs

Studio Integration External Connections System Integration

Key Feature:

• Connect modular to external equipment

✓ PROS

• Essential for studio integration
• Connect modular to external equipment

✗ CONS

• Multiple types may be needed
• Not directly creative or musical

Intellijel Designs Stereo Line In 1UInput moduleFor connection with Palette Case7U Case (only with 7U Audio Jacks Board...

⭐ 4.7/5 (56 reviews)

Sound:

6/10

Build:

6/10

Value:

9/10

Art. 488613

$81

Buy at Thomann View Details

Intellijel Designs Headphones 1U - Professional Music Instrument Photo

⭐ 5.0/5 (47 reviews)

Sound:

6/10

Build:

7/10

Value:

10/10

Intellijel Designs Headphones 1U

by Intellijel Designs

Format Conversion Signal Routing External Connections

Key Feature:

• Protect sensitive modular circuits

✓ PROS

• Enable use of external processors
• Protect sensitive modular circuits

✗ CONS

• Not directly creative or musical
• Multiple types may be needed

Intellijel Designs Headphones 1U, Headphone and stereo output for Eurorack systems, High-quality headphone output for...

⭐ 5.0/5 (47 reviews)

Sound:

6/10

Build:

7/10

Value:

10/10

Art. 440171

$86

Buy at Thomann View Details

Intellijel Designs Stereo Out 1U - Professional Music Instrument Photo

⭐ 5.0/5 (28 reviews)

Sound:

6/10

Build:

6/10

Value:

8/10

Intellijel Designs Stereo Out 1U

by Intellijel Designs

Level Matching Studio Integration Signal Routing

Key Feature:

• Protect sensitive modular circuits

✓ PROS

• Level and impedance matching
• Enable use of external processors

✗ CONS

• Additional cost for basic functionality
• May introduce noise or coloration

Intellijel Designs Stereo Out 1UOutput moduleTo connect with Palette Case7U Case (only with 7U Audio Jacks Board V2) or...

⭐ 5.0/5 (28 reviews)

Sound:

6/10

Build:

6/10

Value:

8/10

Art. 469646

$86

Buy at Thomann View Details

Doepfer A-139-2 Headphone Amplifier - Professional Music Instrument Photo

⭐ 4.9/5 (16 reviews)

Sound:

8/10

Build:

6/10

Value:

10/10

Doepfer A-139-2 Headphone Amplifier

by Doepfer

System Integration Level Matching External Connections

Key Feature:

• Enable use of external processors

✓ PROS

• Enable use of external processors
• Essential for studio integration

✗ CONS

• Additional cost for basic functionality
• Not directly creative or musical

Doepfer A-139-2 Headphone Amplifier2-Channel Headphone AmplifierIn the Eurorack module format2 Inputs with separate...

⭐ 4.9/5 (16 reviews)

Sound:

8/10

Build:

6/10

Value:

10/10

Art. 367624

$65

Buy at Thomann View Details

Behringer Cu1A - Professional Music Instrument Photo

⭐ 5.0/5 (6 reviews)

Sound:

8/10

Build:

6/10

Value:

8/10

Behringer Cu1A

by Behringer

System Integration Signal Routing External Connections

Key Feature:

• Essential for studio integration

✓ PROS

• Enable use of external processors
• Level and impedance matching

✗ CONS

• May introduce noise or coloration
• Not directly creative or musical

Behringer Cu1AEurorack ModuleTwo-Channel USB-C Audio Interface48 kHz ConverterHeadphone connection with volume control...

⭐ 5.0/5 (6 reviews)

Sound:

8/10

Build:

6/10

Value:

8/10

Art. 576779

$94

Buy at Thomann View Details

Doepfer A-119 - Professional Music Instrument Photo

⭐ 4.5/5 (52 reviews)

Sound:

8/10

Build:

5/10

Value:

10/10

Doepfer A-119

by Doepfer

Signal Routing Studio Integration External Connections

Key Feature:

• Protect sensitive modular circuits

✓ PROS

• Enable use of external processors
• Connect modular to external equipment

✗ CONS

• May introduce noise or coloration
• Additional cost for basic functionality

Doepfer A-119, External Input / Envelope FollowerModule A-119 is used to integrate external audio signals into the...

⭐ 4.5/5 (52 reviews)

Sound:

8/10

Build:

5/10

Value:

10/10

Art. 169621

$83

Buy at Thomann View Details

Befaco 1U STAmp - Professional Music Instrument Photo

⭐ 4.9/5 (40 reviews)

Sound:

8/10

Build:

5/10

Value:

9/10

Befaco 1U STAmp

by Befaco

Format Conversion Studio Integration System Integration

Key Feature:

• Enable use of external processors

✓ PROS

• Connect modular to external equipment
• Enable use of external processors

✗ CONS

• Additional cost for basic functionality
• May introduce noise or coloration

Befaco 1U STAmpStereo Amplifier for External SignalsAudio input (3.5 mm stereo jack) with level control3 Selectable...

⭐ 4.9/5 (40 reviews)

Sound:

8/10

Build:

5/10

Value:

9/10

Art. 564590

$87

Buy at Thomann View Details

Doepfer A-119 VE - Professional Music Instrument Photo

⭐ 4.9/5 (31 reviews)

Sound:

6/10

Build:

7/10

Value:

8/10

Doepfer A-119 VE

by Doepfer

Level Matching Studio Integration System Integration

Key Feature:

• Protect sensitive modular circuits

✓ PROS

• Connect modular to external equipment
• Enable use of external processors

✗ CONS

• Takes up valuable HP space
• Additional cost for basic functionality

Doepfer A-119 VEEurorack moduleExternal input / Envelope followerWidth: 8 TE / 40.3 mmDepth: 45 mm (measured from the...

⭐ 4.9/5 (31 reviews)

Sound:

6/10

Build:

7/10

Value:

8/10

Art. 515450

$87

Buy at Thomann View Details

Expert Sleepers ES-7 - Professional Music Instrument Photo

#10

⭐ 4.9/5 (4 reviews)

Sound:

6/10

Build:

5/10

Value:

8/10

Expert Sleepers ES-7

by Expert Sleepers

Level Matching System Integration Format Conversion

Key Feature:

• Essential for studio integration

✓ PROS

• Level and impedance matching
• Connect modular to external equipment

✗ CONS

• Takes up valuable HP space
• Additional cost for basic functionality

Expert Sleepers ES-7Eurorack ModuleProvides two channels of DC-coupled CV input to a connected ES-4ES-40 or ES-6...

⭐ 4.9/5 (4 reviews)

Sound:

6/10

Build:

5/10

Value:

8/10

Art. 443423

$85

Buy at Thomann View Details

Rides In The Storm CON - Professional Music Instrument Photo

#11

⭐ 4.4/5 (46 reviews)

Sound:

8/10

Build:

6/10

Value:

9/10

Rides In The Storm CON

by Rides In The Storm

External Connections Format Conversion Signal Routing

Key Feature:

• Level and impedance matching

✓ PROS

• Enable use of external processors
• Protect sensitive modular circuits

✗ CONS

• Takes up valuable HP space
• Additional cost for basic functionality

Rides In The Storm CONEurorack moduleQuad gain converterConverts 2 channels from line level to Eurorack level and 2...

⭐ 4.4/5 (46 reviews)

Sound:

8/10

Build:

6/10

Value:

9/10

Art. 522194

$65

Buy at Thomann View Details

Befaco 1U Out - Professional Music Instrument Photo

#12

⭐ 4.8/5 (9 reviews)

Sound:

8/10

Build:

7/10

Value:

8/10

Befaco 1U Out

by Befaco

Studio Integration External Connections Signal Routing

Key Feature:

• Enable use of external processors

✓ PROS

• Connect modular to external equipment
• Level and impedance matching

✗ CONS

• Additional cost for basic functionality
• May introduce noise or coloration

Befaco 1U OutAudio InterfaceStereo input (2 x 3.5 mm jack) with level controlSwitchable cue inputStereo headphone...

⭐ 4.8/5 (9 reviews)

Sound:

8/10

Build:

7/10

Value:

8/10

Art. 564591

$98

Buy at Thomann View Details

Behringer Perfect Pitch PP1 - Professional Music Instrument Photo

#13

⭐ 4.8/5 (34 reviews)

Sound:

8/10

Build:

6/10

Value:

10/10

Behringer Perfect Pitch PP1

by Behringer

System Integration Signal Routing Level Matching

Key Feature:

• Protect sensitive modular circuits

✓ PROS

• Protect sensitive modular circuits
• Connect modular to external equipment

✗ CONS

• May introduce noise or coloration
• Not directly creative or musical

Behringer Perfect Pitch PP1Eurorack ModuleConverter for instrumentline and microphone signals to MIDIUSB-MIDI and...

⭐ 4.8/5 (34 reviews)

Sound:

8/10

Build:

6/10

Value:

10/10

Art. 566032

$85

Buy at Thomann View Details

ADDAC 309 CV to Expression - Professional Music Instrument Photo

#14

⭐ 5.0/5 (40 reviews)

Sound:

7/10

Build:

5/10

Value:

10/10

ADDAC 309 CV to Expression

by ADDAC

External Connections System Integration Level Matching

Key Feature:

• Essential for studio integration

✓ PROS

• Level and impedance matching
• Essential for studio integration

✗ CONS

• Multiple types may be needed
• Additional cost for basic functionality

ADDAC 309 CV to ExpressionEurorack ModuleAllows the use of CV signals on expression pedal inputs of effect devices2...

⭐ 5.0/5 (40 reviews)

Sound:

7/10

Build:

5/10

Value:

10/10

Art. 583754

$83

Buy at Thomann View Details

Doepfer A-119-2 - Professional Music Instrument Photo

#15

⭐ 4.6/5 (33 reviews)

Sound:

6/10

Build:

5/10

Value:

8/10

Doepfer A-119-2

by Doepfer

Studio Integration Format Conversion Level Matching

Key Feature:

• Enable use of external processors

✓ PROS

• Level and impedance matching
• Protect sensitive modular circuits

✗ CONS

• Takes up valuable HP space
• May introduce noise or coloration

Doepfer A-119-2Eurorack ModuleDual input amplifier2-Channel amplifier for audio signals and control voltagesPer...

⭐ 4.6/5 (33 reviews)

Sound:

6/10

Build:

5/10

Value:

8/10

Art. 615938

$72

Buy at Thomann View Details

How to Choose the Best Interface Modules

Budget Planning

• Under $200: Entry-level
• $200-$500: Intermediate
• $500-$1000: Advanced
• $1000+: Professional

Quality Check

• Sound clarity & tone
• Build materials & finish
• Hardware durability
• Overall craftsmanship

Key Features

• Your musical style
• Skill level match
• Intended use case
• Brand reputation

Frequently Asked Questions

Key factors include build quality, sound characteristics, playability, brand reputation, warranty coverage, and value for money. Consider your musical style, skill level, and intended use to find the best match.

Budget depends on your needs and experience level. Beginners can find quality options for $200-500, intermediate players should consider $500-1500 range, while professionals often invest $1500+ for premium features.

Higher-priced interface modules typically offer better materials, craftsmanship, and performance. They're worth it if you're serious about music, perform regularly, or need professional-grade features.

Top brands combine quality, innovation, and reliability. We evaluate brands based on build quality, sound performance, durability, and customer satisfaction to recommend the best options for different budgets.

Both have advantages. Online offers better prices and selection, while stores allow hands-on testing. We recommend researching online first, then testing in stores if possible. Many online retailers offer excellent return policies.

Related Best Lists

TOP

Best Interface Modules Under $100 2025

Ritual Electronics Flexibilité

Intellijel Designs Stereo Line In 1U

Intellijel Designs Headphones 1U

Intellijel Designs Stereo Out 1U

Doepfer A-139-2 Headphone Amplifier

Behringer Cu1A

Doepfer A-119

Befaco 1U STAmp

Doepfer A-119 VE

Expert Sleepers ES-7

Rides In The Storm CON

Befaco 1U Out

Behringer Perfect Pitch PP1

ADDAC 309 CV to Expression

Doepfer A-119-2

How to Choose the Best Interface Modules

Budget Planning

Quality Check

Key Features

Frequently Asked Questions

What should I look for when buying interface modules?

How much should I spend on interface modules?

Are expensive interface modules worth the investment?

What are the best brands for interface modules?

Should I buy interface modules online or in-store?

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