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Multi-Way Conventional loudspeakers with crossovers

Some speaker driver measurements...
Some speaker driver measurements...
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Old 8th July 2019, 07:41 PM   #341
sashiok is offline sashiok  Moldova
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Default Atohm LD 150 CR04 driver

Hi, Here is my mini review of ATOHM LD 150 CR04 driver, Price is 240euro/piece, Review of this driver is only a reference to SB 15NRXC30-08 that is very popular and have a lot of measurements on net.
ATOHM LD 150 CR04: The suspension is very stiff !!! aprox 2.5 times stiffer than of SB; The resonance is measured only through high resistance resistor connected in series, that made a very clear SPL peak of 76hz in free air (it is very high resonance compared to usual 100cm2 driver) in a 9.7 liter box the resonance was 94hz that resulted the VAS is 5.3 lit !!! Driver was not burned very long, but anyway it is stiff. The QTS was not measured but it is higher than 0.6. The building quality is excellent. The company does not specify what type of cone material (alliage specifique), but by feelings it is a type of plastic that is very stiff compared with other, the edge of cone can be bended so it is not metal.
Measurements: Note!!!! Read data of ATOHM LD 150 CR04 only as reference to SB 15NRXC30-08 that both were measured in same box and conditions :
SPL Note Atohm spl was recessed by 3db because it has higher sensitivity than SB by 3db for the same voltage input. This was done for better comparison.
atohm vs sb 60cm.png

Distortion in percent of Atohm LD 150 CR04 (missing f5 component)
distortion atohm.png

Distortion in percent of SB 15NRXC30-08 (missing f5 component)
distortion sb.png

CSD of Atohm with a notch filter 6.3khz 12db q=4 taking the peak off for making the opportunity to see full csd window below useful 3khz (that is not possible with peak present)
atohm noch 6.3khz 12db q4 csd.png

CSD of SB with a notch filter 8khz 12db q=2 taking the peak off for making the opportunity to see full csd window below useful 3khz (that is not possible with peak present)
sbacoust noch 8khz 12db q2 csd.png
My subjective impression: Donít expect this expensive driver not to color the sound; It has some color: I feel a little bit of plastic sound (yes I know about placebo and prejudice, because I already think that the cone is like plastic, have no idea what is the reason but steel fell like this) but it does not sound boring like other plastic cone that have blurred attach; by contras it accentuate some hits type sound like: clap hands, finger snap, some drums kicks; it also accentuate growling sound, horn sound. Sometimes this coloration is pleasant, hearing big horn sound I want to up volume to maximum and enjoy the power. Please ignore the implementation as a source of the main coloration; I can easy make flat response with DSP or equal it to SB acoustics with rational crossover point Ö.. no matter, the sound of both have colorations and they sound very different. My recommendation donít buy this driver until you hear it; You can listen to commercial speakers of the same brand Atohm gt1 where this driver is implemented and then make decision. To me it has a bit more resolution then SB, more attention on voices, mids and attacks, but SB sound warmer more relaxed. If price where no object I would chose Atohm but it is 5 !!! times more expensive then SB so Atohm is low value driver, even more some would prefer the sound of SB over Atohm. You can listen to Atohm gt 1 through youtube reviews +headphones, it is not a serious listening but it will give some idea of how it sound.
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Old 11th July 2019, 04:15 PM   #342
HiFiCompass is offline HiFiCompass  Ukraine
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Thank you for the contribution. I have never worked with Atohm speakers.
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Old 13th July 2019, 10:26 AM   #343
HiFiCompass is offline HiFiCompass  Ukraine
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The measurements of the Morel SCW636 woofer have been added:

Morel SCW636 | HiFiCompass
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Old 20th July 2019, 09:38 AM   #344
HiFiCompass is offline HiFiCompass  Ukraine
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The measurements of the Morel TSCM634 midrange speaker have been added:

Morel TSCM634 | HiFiCompass
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