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Dynaudio Speakers Authentic Fidelity

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  #1  
Old 04-26-2021, 01:44 PM
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Default Danny Richie tears the Special 40 apart

Literally and figuratively.

Danny Richie of GR-Research recently did his extensive analysis (including measurements with his Clio system) of the Dynaudio Special 40.

Looks like Dyn cheaped out on this speaker that originally sold for $2995.

The woofer measures suprisingly poorly with notable peaks at 1110 hz, 3400, hz and 10K. Danny refers to it as "rough".



There is also a significant ringing component to the woofer in the spectral decay. John Atkinson obtained effectively identical results when he measured the Special 40 in Stereophile.



The parts for the crossover, wiring and fill is also problematical.

Iron-core inductors, sand-cast resistors, cheap poly and electrolytics caps in the XO, and el-cheapo, 16 AWG PVC insulated clip-on leads for the internal wiring, and a poorly-damped cabinet with cheap fill.

Danny's reaction...




Danny did say that Dyn spent an extra 10˘ and used binding posts that are non-ferric, so..that's good.

Danny went through and fixed the issues with the drivers, their measured performance and improved the overall frequency response to be smoother and within 1-1.5 dB. Also knocked down the knee at 1100 Hz peak in the mids.



You'll also note that the behavior of the woofer is quite a bit smoother.

He also reduced the ringing component of the woofer to a considerably lower level in the spectral decay.


I'll leave you to watch the video to see how got these issues fixed with his mods. Needless to say, he improved it quite a bit. Most notable is the improvement in the vertical off-axis response with the drivers remaining in phase as you go up.

https://youtu.be/0TxorWiy78w

Total cost of the parts for upgrading the Dyn Special 40 is $245. Having built one of Danny's speaker designs using his parts, wire, and drivers, I would think the Special 40 is quite a bit better with his modifications.
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Last edited by Puma Cat; 04-26-2021 at 01:54 PM.
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  #2  
Old 05-08-2021, 11:53 PM
Low325 Low325 is offline
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Not so special? Someone needs to send him the Heritage
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  #3  
Old 05-09-2021, 12:09 PM
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Quote:
Originally Posted by Low325 View Post
Not so special? Someone needs to send him the Heritage
Yep, looks like Dyn cheaped out on the BOM, and the connectors, wire, and damping materials. That woofer's performance is pretty rough.

As for the Heritage, I was thinking the same thing. That would be interesting.
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Old 05-09-2021, 08:38 PM
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You need someone else to tell you whether some speaker is good or not?
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Old 05-10-2021, 06:08 AM
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Default

I would be curious to know what he has to say about the Harbeth 30s series...
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Old 05-10-2021, 03:36 PM
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Quote:
Originally Posted by joel_hifi View Post
I would be curious to know what he has to say about the Harbeth 30s series...
Yeah, me too, and I've thought about sending one of mine to Danny. My only hesitancy is that it is very difficult to remove the speaker "grilles" without damaging the cabinets. My understanding is that Harbeth uses a special tool to do this.
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Last edited by Puma Cat; 05-10-2021 at 03:40 PM.
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  #7  
Old 05-10-2021, 03:43 PM
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Quote:
Originally Posted by Puma Cat View Post
Yeah, me too, and I've thought about sending one of mine to Danny.
Please do, we need that one too, then I can safely order a kit for each of my crappy but beloved speakers
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Music Room - Sonus Faber Elipsa SE / Magnepan 1.7i (alternating), Goldmund Telos 280 / Pass Labs XA30.8 / Jadis DA 8 (alternating), Nagra Jazz, Ayon Stealth, Innuos ZENith Mk3 (Roon Core), SweetVinyl SC-1 Mini, Einstein Little Big Phono, Clearaudio Innovation Basic/TT5/Lyra Delos, Transrotor ZET-1/TR-800S/Hana SL, VPI 16.5, Studer A807, Brocksieper EarMax-Pro / Burson Conductor V2+ (alternating), Audeze LCD-2, AudioQuest NightHawk, Mezze 99 Classic, Sennheiser HD650, Sennheiser HD800, Finite Elemente Pagode

SET/SEP Bliss - Omega Compact Alnico Monitors, Audion Silver Night SE (Psvane 300B-L), Audion Premier (Amperex Globe 6DJ8, Sylvania GB5687), Dennis Had Inspire Fire-Bottle (Golden Lion KT88, GE NOS 6SN7 GTB, Sovtek 5AR4), Line-Magnetic LM-845 Premium (Psvane ACME 845, Elrog 300B or Psvane ACME 300B, Psvane WE 310A, Linlai 12AX7)

Library - Harbeth 30.1 35th, ProAc SM100, Dynaudio Special Forty (alternating), T+A V10, Mytek Brooklyn, Auralic Aries, Benz Lukascheck PP1, T+A G10/SME M2-9/Benz Glider SL

Bedroom - Sonus Faber Cremona, PrimaLuna Dialogue Two (SED =C= KT88), Simaudio Moon 100D, Auralic Aries Mini, Heed Quesar/Q-PSU, Cleauraudio Concept Performance DC/Clarity/Virtuoso V2

Office - Spendor A1/IsoAcoustics ISO-130, Naim NAP100, Benchmark DAC1 HDR, HP Envy Curved Desktop PC

Summer Place - Buchardt A500 (with Mastertuning 3.0 way and Room EQ)
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