Comparision of euraudio DIY loudspeaker designs

Note to the material cost calculations: Surface finish, e.g. painting or veneering is not included in the material cost calculation. The material cost was calculated with moderately priced crossover components specified in the building description. Note also that shipping costs may significantly add to the total of expenses.

The listed loudspeakers:

Vivace 100: A small 2-way vented bookshelf speaker

Kharis 100: A 2-way vented nearfield monitor

Lumina 100: A 2.5-way closed box low distortion floorstanding loudspeaker

Lumina 110: A 2.5-way vented low distortion floorstanding loudspeaker

 

Vivace 100

A small 2-way vented bookshelf speaker

Designer

István Gerencsér

Design goals

My goal was to design a cheap, small bookshelf speaker with smooth frequency response, for listening to background music.

Advantages

- smooth frequency response

- high performance/cost ratio

- very cheap

Disadvantages

- bass boost is needed when placed far from walls

- stand is needed when not placed on bookshelf

- low sensitivity and low power rating

Material cost

Vivace 100 utilizes two very low priced SB Acoustics drivers. In this way the material cost of one loudspeaker is about 90 EUR only (2018 prices).

Prospective technical data

Impedance: 4 ohms

Frequency range +/- 3 dB: 65-25,000 Hz (with +5 dB bass boost)

Rated noise power: 35 W

Sensitivity: 85 dB SPL/2.83V RMS/m (@1kHz)

Listening setup

Vivace 100 features the "boostable rolloff" frequency response characteristics, which I generally adopt in my cheaper two-way designs, that is sound pressure gradually falls off from 1 kHz to 100 Hz. When this loudspeaker is placed far from the back wall, the bass needs to be boosted by 5...6 dB to reach flat frequency response. For more information on "boostable rolloff" CLICK HERE.

The recommended position of the Vivace 100 is on a bookshelf surrounded by books and far from the side wall. In this position, there is no need for a bass boost.

Building description

Building Vivace 100

 

Kharis 100

A 2-way vented nearfield monitor

Designer

István Gerencsér

Design goals

My goal was to design a cheap yet quality nearfield monitor using the Dayton DA175-8 aluminum cone midwoofer that is known to have a good price/ performance ratio.

Advantages

- high quality

- high performance/cost ratio

- cheap

- no subwoofer needed for music

Disadvantages

- stand is needed

- very low sensitivity (sit close to listen)

- there is some peaking in the bass response around 70 Hz (punchy bass)

Material cost

Kharis 100 utilizes two low priced drivers and a relatively simple crossover. In this way the material cost of one loudspeaker is about 145 EUR only (2018 prices).

Prospective technical data

Impedance: 8 ohms

Frequency range +/- 3 dB: 45-24,000 Hz

Rated noise power: 65 W

Sensitivity: 80 dB SPL/2.83V RMS/m

Listening setup

The recommended listening position of the Kharis 100 is: place it at least 1.5 meter from all walls and sit close up at 70...100 cm from the speakers. The listeners's ears should be vertically at around the midpoint between the tweeter and the midwoofer.

Building description

Building Kharis 100

 

Lumina 100

A 2.5-way closed box low distortion floorstanding loudspeaker

Designer

István Gerencsér

Design goals

My goal was to design a very low distortion loudspeaker with clear, detailed sound, which has a very smooth frequency response in its entire passband and has neither partial cone resonances nor standing wave resonances that disturb its sound reproduction.

Advantages

- audiophile grade

- high performance/cost ratio

- very smooth frequency response without standing waves or partial resonances

- low distortion

Disadvantages

- subwoofer is recommended, which needs to be set up carefully

Material cost

The material cost is about 370 EUR per loudspeaker (2018 prices). Aluminum diaphragm SB Acoustics drives were used, which have a very good price/ performance ratio, thus a medium priced, yet outstanding quality loudspeaker can be constructed.

Prospective technical data

Impedance: 4 ohms

Frequency range +/- 3 dB: 65-25,000 Hz

Rated noise power: 75 W

Sensitivity: 87 dB SPL/2.83V RMS/m

Listening setup

It's recommended to complement Lumina 100 with a subwoofer with 12 dB/octave cutoff slope (preferably Linkwitz-Riley alignment), set to 50..55 Hz cutoff frequency, with phase inversion, and placed so that the listener's ears are at equal distance from the main speakers and the subwoofer.

The recommended listening position of the Lumina 100 is: place it at least 1.5 meter from all walls and sit close up at 70...100 cm from the speakers. The listeners's ears should be vertically at around the midpoint between the tweeter and the top midwoofer.

Building description

Building Lumina 100

 

Lumina 110

A 2.5-way vented low distortion floorstanding loudspeaker

Designer

István Gerencsér

Design goals

My goal was to design a ported enclosure version of the Lumina 100, which doesn't need a subwoofer, yet maintains its low distortion properties.

Advantages

- audiophile grade

- high performance/cost ratio

- smooth frequency response without partial resonances

- low distortion

Disadvantages

- a moderate standing wave resonance along cabinet length

Material cost

The material cost is about 385 EUR per loudspeaker (2018 prices). Aluminum diaphragm SB Acoustics drives were used, which have a very good price/ performance ratio, thus a medium priced, yet outstanding quality loudspeaker can be constructed.

Prospective technical data

Impedance: 4 ohms

Frequency range +/- 3 dB: 42-25,000 Hz

Rated noise power: 75 W

Sensitivity: 87 dB SPL/2.83V RMS/m

Listening setup

The recommended listening position of the Lumina 110 is: place it at least 1.5 meter from all walls and sit close up at 70...100 cm from the speakers. The listeners's ears should be vertically at around the midpoint between the tweeter and the top midwoofer.

Building description

Building Lumina 110

 

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