Foreword / YouTube Video Review

This is a kit speaker where the parts are purchased from the manufacturer and the user assembles them.

These speakers were loaned to me to review by the manufacturer. I was not paid nor did I receive any other form of compensation for this review.

All my reviews are done on my own time with great care to give you all the best set of data and information I can provide in order to help you make a well-informed purchase decision. I offer this for free to all who are interested. In return, if you want to support this site please see the bottom of this review for ways you can help. It is greatly appreciated.

The review on this website is a brief overview and summary of the objective performance of this speaker. It is not intended to be a deep dive. Moreso, this is information for those who prefer “just the facts” and prefer to have the data without the filler. The video below has more discussion with respect to the technical merits and subjective notes I had during my listening sessions.

Manufacturer Specs:

• Type: 2-way bass reflex design
• Transducers:
  • 1” ceramic-aluminum tweeter
  • 5” ceramic-aluminum cone woofer
• Crossover frequency: 1560Hz (3rd-order acoustical)
• Sensitivity: 84dB SPL 1m/2.83V
• Frequency response (-6dB): 42 - 31.6kHz
• Impedance: 4Ω (Minimum 3.2Ω)
• Recommend amplifier power: 40 - 250W
• Dimensions (including terminals): H 300 mm x W 180 mm x D 297.6 mm
• Weight (per unit) 6.8 kg

As of this writing MSRP is €950/pair which is currently about $1100 USD (plus shipping and VAT from the UK).

CTA-2034 (SPINORAMA) and Accompanying Data

All data collected using Klippel’s Near-Field Scanner. The Near-Field-Scanner 3D (NFS) offers a fully automated acoustic measurement of direct sound radiated from the source under test. The radiated sound is determined in any desired distance and angle in the 3D space outside the scanning surface. Directivity, sound power, SPL response and many more key figures are obtained for any kind of loudspeaker and audio system in near field applications (e.g. studio monitors, mobile devices) as well as far field applications (e.g. professional audio systems). Utilizing a minimum of measurement points, a comprehensive data set is generated containing the loudspeaker’s high resolution, free field sound radiation in the near and far field. For a detailed explanation of how the NFS works and the science behind it, please watch the below discussion with designer Christian Bellmann:

IMPORTANT SETUP INFO: This speaker was measured with the reference point at the tweeter. Speaker was broken in. No grille was used.

Measurements are provided in a format in accordance with the Standard Method of Measurement for In-Home Loudspeakers (ANSI/CTA-2034-A R-2020). For more information, please see this link.

CTA-2034 / SPINORAMA:

The On-axis Frequency Response (0°) is the universal starting point and in many situations it is a fair representation of the first sound to arrive at a listener’s ears.

The Listening Window is a spatial average of the nine amplitude responses in the ±10º vertical and ±30º horizontal angular range. This encompasses those listeners who sit within a typical home theater audience, as well as those who disregard the normal rules when listening alone.

The Early Reflections curve is an estimate of all single-bounce, first-reflections, in a typical listening room.

Sound Power represents all of the sounds arriving at the listening position after any number of reflections from any direction. It is the weighted rms average of all 70 measurements, with individual measurements weighted according to the portion of the spherical surface that they represent.

Sound Power Directivity Index (SPDI): In this standard the SPDI is defined as the difference between the listening window curve and the sound power curve.

Early Reflections Directivity Index (EPDI): is defined as the difference between the listening window curve and the early reflections curve. In small rooms, early reflections figure prominently in what is measured and heard in the room so this curve may provide insights into potential sound quality.

Early Reflections Breakout:

Floor bounce: average of 20º, 30º, 40º down

Ceiling bounce: average of 40º, 50º, 60º up

Front wall bounce: average of 0º, ± 10º, ± 20º, ± 30º horizontal

Side wall bounces: average of ± 40º, ± 50º, ± 60º, ± 70º, ± 80º horizontal

Rear wall bounces: average of 180º, ± 90º horizontal

Estimated In-Room Response:

In theory, with complete 360-degree anechoic data on a loudspeaker and sufficient acoustical and geometrical data on the listening room and its layout it would be possible to estimate with good precision what would be measured by an omnidirectional microphone located in the listening area of that room. By making some simplifying assumptions about the listening space, the data set described above permits a usefully accurate preview of how a given loudspeaker might perform in a typical domestic listening room. Obviously, there are no guarantees, because individual rooms can be acoustically aberrant. Sometimes rooms are excessively reflective (“live”) as happens in certain hot, humid climates, with certain styles of interior décor and in under-furnished rooms. Sometimes rooms are excessively “dead” as in other styles of décor and in some custom home theaters where acoustical treatment has been used excessively. This form of post processing is offered only as an estimate of what might happen in a domestic living space with carpet on the floor and a “normal” amount of seating, drapes and cabinetry.

For these limited circumstances it has been found that a usefully accurate Predicted In-Room (PIR) amplitude response, also known as a “room curve” is obtained by a weighted average consisting of 12 % listening window, 44 % early reflections and 44 % sound power. At very high frequencies errors can creep in because of excessive absorption, microphone directivity, and room geometry. These discrepancies are not considered to be of great importance.

Horizontal Contour Plot (normalized):

Vertical Contour Plot (normalized):

Additional Measurements

Impedance

Response Linearity

Horizontal Frequency Response:

Vertical Frequency Response:

Step Response

Group Delay

Burst Decay

This data is full anechoic where most spectral decay type graphics are created using quasi-anechoic data. For more information on the differences between Burst Decay and Cumulative Spectral Decay (CSD) graphics please see Section 6.5 of the ARTA User Manual linked below. I would like to extend a professional "thank you" to Ivo Mateljan for this software.

ARTA User Manual

Harmonic Distortion

Harmonic Distortion at 86dB @ 1m:

Harmonic Distortion at 96dB @ 1m:

Dynamic Range (Instantaneous Compression Test)

The below graphic indicates just how much SPL is lost (compression) or gained (enhancement; usually due to distortion) when the speaker is played at higher output volumes instantly via a 2.7 second logarithmic sine sweep referenced to 76dB at 1 meter. The signals are played consecutively without any additional stimulus applied. Then normalized against the 76dB result.

The tests are conducted in this fashion:

1. 76dB at 1 meter (baseline; black)
2. 86dB at 1 meter (red)
3. 96dB at 1 meter (blue)
4. 102dB at 1 meter (purple)

The purpose of this test is to illustrate how much (if at all) the output changes as a speaker’s components temperature increases (i.e., voice coils, crossover components) instantaneously.

Multitone Distortion

The following tests are conducted at (4) approximate equivalent output volumes: 70/79/87/96dB @ 1 meter. The (4) voltages listed in the legend result in these SPL values. This test signal is dense, similar to pink noise and excites the entire spectrums listed below at the same time. The test signal lasts 30 seconds. This is different than the sine wave test signal used to measure frequency response. The purpose of this distortion and compression test is to illustrate how much (if at all) the output changes as a speaker’s components temperature increases (i.e., voice coils, crossover components) over time.

Given the test signal is similar to pink noise and exciting the entire spectrum at the same time I also include compression results, which is captured at the same time distortion is captured. Sometimes these results differ from the compression results you see above (namely with powered designs incorporating DSP-based limiting).

Note: The KLIPPEL software shows compression in the positive scale.

The test was conducted in (3) manners:

1. Full bandwidth (20Hz to 20kHz)
2. 80Hz to 20kHz

The reason for the two measurements is to simulate running the speaker full range vs using a high-pass filter at 80Hz. However, note: the 2nd test low frequency limit at 80Hz is a “brick wall” and doesn’t quite emulate a standard filter of 12 or 24dB/octave. But… it’s close enough to illustrate the point.

1. Full bandwidth (20Hz to 20kHz)

2. 80Hz to 20kHz

Parting / Random Thoughts

See video linked above for full subjective and objective analysis. An AI-generated summarized transcript is provided below:

Subjective Listening Impressions

• I found the speaker to be extremely linear and accurate, with a flat on-axis response and natural in-room tilt
• Bass reaches down to ~50 Hz in-room, making it suitable for most music without a subwoofer
• The wide radiation pattern delivers an enveloping and immersive soundstage
• The driver handoff is smooth—something I usually only hear with coaxials or waveguide designs
• Main limitation: it runs out of steam above ~90 dB @ 10 ft, so it’s not ideal for large rooms or home theater levels
• There’s a slight bump around 5–6 kHz that can add a bit of sibilance, but nothing fatiguing
• I directly A/B’d this with $100k+ speakers, and in terms of tonal balance, these walked all over them
• Best suited for small to medium rooms; add a subwoofer if you want full-range performance

Kit Details & Build

• 2-way bass-reflex design featuring:
  • 5” ceramic aluminum woofer
  • 1” ceramic aluminum dome tweeter
  • 1560 Hz 3rd-order acoustic crossover
• Manufacturer-rated sensitivity: 84 dB
• Impedance: 4 ohms nominal, 3.2 ohm minimum
• Recommended amp power: 40–250 watts
• Each speaker weighs about 6.8 kg
• The kit includes everything needed except tools—Audio First has a build video that I recommend checking out

Objective Data Highlights

• My measured sensitivity was 83.5 dB
• F3 is at 53 Hz, F10 at 38 Hz—great low-end for the size
• Horizontal radiation is ~±70°, offering consistent tonality across the listening area
• The 5–6 kHz bump is visible in measurements and matches the slight sibilance I heard
• Towing out the speakers 30° introduces a mild dip around 2–3 kHz, which may warm up the sound
• There are minor resonances at ~2–3 kHz and 8 kHz, but they’re low in level and not audibly distracting
• Vertically, you’ll want to sit between the tweeter and woofer—don’t go below that axis
• Midrange distortion increases above 96 dB, but if you use a subwoofer with an 80 Hz crossover, it improves
• Compression results show ~3–4 dB dynamic range loss at higher volumes—acceptable for a speaker this size

Sound Demo Methodology

• I don’t use traditional room recordings; instead, I convolve impulse responses with music
• This won’t replicate a room, but it offers a better idea of tonal differences
• The most noticeable trait is the roll-off below ~50 Hz
• Otherwise, it stays very true to the source

Buying Advice & Final Thoughts

• If you’re comfortable building the kit, I absolutely recommend this speaker
• It’s ideal for anyone looking for an accurate, compact speaker with wide off-axis performance
• Not designed for high SPL or large rooms without a sub
• This is one of the best-measuring and best-sounding kits I’ve reviewed to date
• If you want to support what I’m doing, you can use the affiliate links or check out my Patreon

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