Hello, here i would present and discuss my new Speaker Design stepp by stepp.
At the End i will use aktive Elektronic for Crosover.
But also the Use of an passiv Crossover i will show you.
My first Step is already done.
The Design off an Waveguide for my Harwood AMT25.
https://www.diyaudio.com/community/...-cnc-3d-printing.318190/page-127#post-8023326
For the Midrange Speaker i will Use 2x Scanspeak 18W8434G00 Parallel.
I used the AMT 25 already in an 2 Way Box with an 18W4434G00 (Aktiv Time alligned) and this worked already very well.
For an MTM Kombination i need an deeper Crossover Point so i decided to build the Waveguide for an Crossover Point Between 1800 and 2000 kHz.
Next Step was to find Out how an MTM Measurement looks like Vertical and Horizontal.
For the first Approach i used my build 2 Way Speaker and put them together:
The Distance between the Middriver here is around 261mm Center to Center
Vertical i Measures This Way:
And here how it looks (Red line Microphone @ Point A, Green @ Point B):
Here the same Measurement with an greater Distance between the Middriver:
And the Measurments (Red line Microphone @ Point A, violet @ Point B):
Verticaly it is bettter to have the Driver Close togther, spcialy for an Corsoverpoint of 1800 to 2000Hz! I would say.
On the other Hand on a DAPOLITO Box you realy need to have youre ears @ the hight of the Tweeter for best listenning expiriences.
If you can sit, let say 3-5M away from the Box thats is less Important i guess.
But my listinig Position is in between 2,5 to 3M so i need to have the Hight of the Tweeter @ around 80cm from the Ground.
How i measured it Horizonta (Distance MTM 384mm Center to Center for worsed case scenario):
Here you cac see the Horizontal Measurings magenta 0degree, red 25degree and black 40degree:
So i would say Horizotal i could easy use an 2 kHz Crossoverpoint, Verticaly its more difficulty.
At the End i will use aktive Elektronic for Crosover.
But also the Use of an passiv Crossover i will show you.
My first Step is already done.
The Design off an Waveguide for my Harwood AMT25.
https://www.diyaudio.com/community/...-cnc-3d-printing.318190/page-127#post-8023326
For the Midrange Speaker i will Use 2x Scanspeak 18W8434G00 Parallel.
I used the AMT 25 already in an 2 Way Box with an 18W4434G00 (Aktiv Time alligned) and this worked already very well.
For an MTM Kombination i need an deeper Crossover Point so i decided to build the Waveguide for an Crossover Point Between 1800 and 2000 kHz.
Next Step was to find Out how an MTM Measurement looks like Vertical and Horizontal.
For the first Approach i used my build 2 Way Speaker and put them together:
The Distance between the Middriver here is around 261mm Center to Center
Vertical i Measures This Way:
And here how it looks (Red line Microphone @ Point A, Green @ Point B):
Here the same Measurement with an greater Distance between the Middriver:
And the Measurments (Red line Microphone @ Point A, violet @ Point B):
Verticaly it is bettter to have the Driver Close togther, spcialy for an Corsoverpoint of 1800 to 2000Hz! I would say.
On the other Hand on a DAPOLITO Box you realy need to have youre ears @ the hight of the Tweeter for best listenning expiriences.
If you can sit, let say 3-5M away from the Box thats is less Important i guess.
But my listinig Position is in between 2,5 to 3M so i need to have the Hight of the Tweeter @ around 80cm from the Ground.
How i measured it Horizonta (Distance MTM 384mm Center to Center for worsed case scenario):
Here you cac see the Horizontal Measurings magenta 0degree, red 25degree and black 40degree:
So i would say Horizotal i could easy use an 2 kHz Crossoverpoint, Verticaly its more difficulty.
When did you buy these AMTs? The last pair of AC AMT2560s I bought made (another) change to the diaphragm and is no longer usable to me. These Harwoods look like the previous AMT2560 frequency response.
My Design aproach goes this direction:
How wide the Window off that Waveguide would be on the Middriver i need to check. thats only an guess on the Picture!
I will 3D Print that shape off that Waveguide and test it on one Middriver for first Aproach.
The Distnaces between this Middriver on that Picture:
Not to Far i would say 😉
How wide the Window off that Waveguide would be on the Middriver i need to check. thats only an guess on the Picture!
I will 3D Print that shape off that Waveguide and test it on one Middriver for first Aproach.
The Distnaces between this Middriver on that Picture:
Not to Far i would say 😉
This New AM25 i bought last Year (24.04.2024) @ Hifisound.de also 4 new Diapragma for my oldest one (more than 15 years old, my first two, also two for spare 😉 ???)
https://www.hifisound.de/de/Lautspr...d-Acoustics-AM-25-Air-Motion-Transformer.html
https://www.hifisound.de/de/Lautspr...arwood-Acoustics-Ersatzmembran-AMT-AM-25.html
I am very obsessed with this Driver you clould say LOL
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Yes i know but my Ears dont sit there😉 and did this Measuring to check how good my Mid Driver would work between the Center for Waveguide integration!
Also the AMT will not show an good Measuring @ 30 degree Vertikaly i guess.
I will do this Measurings also soon with AMT 25 and Waveguide 😉
I also hope that i get this Advantage because i have Wood on the Room ceilin and on the Graound of my Listening Room and this is realy bad!
I realy need some stuff like this for the Room ceiling:
https://www.amazon.de/dp/B07BD1QJB4...ments&sp_csd=d2lkZ2V0TmFtZT1zcF9kZXRhaWw&th=1
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Yesterday i made an better passive Crossover for an 2 Way Speaker with my Waveguide and the 18W4434g00!
Measuring 1M Distance, 1,1M from Ground:
Stepresponse:
Crossover:
Measuring 1M Distance, 1,1M from Ground:
Stepresponse:
Crossover:
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By the Way, my second Waveguide is done and i did last Afternon a lot off Listening with this Crossover and i was realy blown away how good it is.
Used my Old DENON POA800 and it was already not that bad.
I need to reinstall all my CamillaDSP stuff, so no aktive listening for now, did the mistaker to update the Raspberry to last UBUNTU and now my both Aplication (CamillaDSP and Squeezelight wont work 🙁 ) Need to go into it again LOL
So i could use my HYPEX NCP Amps with MOTU Ultralight MK5
Subwoover wasn't aktiv while Listening!
My Brother in Law was listening to day and he was also blown away, how open it was also much Room and fast Timing on Percusions and Drums.
And never aggressive or Cold!
Used my Old DENON POA800 and it was already not that bad.
I need to reinstall all my CamillaDSP stuff, so no aktive listening for now, did the mistaker to update the Raspberry to last UBUNTU and now my both Aplication (CamillaDSP and Squeezelight wont work 🙁 ) Need to go into it again LOL
So i could use my HYPEX NCP Amps with MOTU Ultralight MK5
Subwoover wasn't aktiv while Listening!
My Brother in Law was listening to day and he was also blown away, how open it was also much Room and fast Timing on Percusions and Drums.
And never aggressive or Cold!
So did my next Measurments, Crossover apllied and Distance changed from 1 to 124cm, Center 1,1M over Ground.
Crossover got an little change, i guess this Resistor didn't do much so i removed it.
Moved the Center's of the Middriver to 294mm, thats +6 mm from my targed design:
Measurment, SPL not Aligned:
And measurments SPL Aligned:
Crossover got an little change, i guess this Resistor didn't do much so i removed it.
Moved the Center's of the Middriver to 294mm, thats +6 mm from my targed design:
Measurment, SPL not Aligned:
And measurments SPL Aligned:
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Horizontal Measurments 0 to 45 degree with Crossover @ 2kHz (12dB Passiv):
And the Results:
I would say thats not Bad @ all and would work very good with passive Crossovers as well.
But the Crossover point is moved a bit, up to 2,3 kHz -6dB in MTM Configuration.
And the Results:
I would say thats not Bad @ all and would work very good with passive Crossovers as well.
But the Crossover point is moved a bit, up to 2,3 kHz -6dB in MTM Configuration.
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The last day i could reinstall my CamillaDSP System and this day i could listening my 2 Way System with Waveguide full aktiv with Hypex NCP Amp's
Measuring quick and dirty 😉 (not perfekt):
The noisefloure is -50 db around Crossover point to signal, so i guess i could easely go to 1800Hz Xover, still away from 1 kHz Resonance with the AM25
FIR Filter LR 96dB !!!
The sound was much Cleaner and i hear deteils in my Musik i never heard befor i guess 🙂
I am satisfied by sure 😉
Distortions down to 700Hz also much better, than the Middriver and my Room kicks inn LOL:
Measuring quick and dirty 😉 (not perfekt):
The noisefloure is -50 db around Crossover point to signal, so i guess i could easely go to 1800Hz Xover, still away from 1 kHz Resonance with the AM25
FIR Filter LR 96dB !!!
The sound was much Cleaner and i hear deteils in my Musik i never heard befor i guess 🙂
I am satisfied by sure 😉
Distortions down to 700Hz also much better, than the Middriver and my Room kicks inn LOL:
Found out the Company Göbel use also an big Waveguide on an AMT:
https://www.stereophile.com/content/göbel-high-end-divin-marquis-loudspeaker-measurements
For an 89000€ Speaker i didn't find this realy sport on:
But Stepresponse looks like normal 3 Way Passiv Speaker i would say.
Spectral decay i don't like also much 🙁 think about the Price!!!
https://www.stereophile.com/content/göbel-high-end-divin-marquis-loudspeaker-measurements
For an 89000€ Speaker i didn't find this realy sport on:
But Stepresponse looks like normal 3 Way Passiv Speaker i would say.
Spectral decay i don't like also much 🙁 think about the Price!!!
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Did one more Test with my Waveguide build and an biger Enclousure 15mm Deep.
Compared 12mm to 15mm deep Enclousures on AM25 with Waveguide fillet completly with Felt:
I would say better to stick with the 12mm Enclousures on the AM25 Waveguide!
15mm would makes more Problems around Resonancefrequencie.
The Measurement shows two different AM 25 in the Same two seperate Waveguides for each, with 12 and 15mm deep Enclousures.
And i was Replacing the Speaker for Measuring so that why i guess there some diferencies between the two AM 25 around 6,5 and 11,5kHz
Compared 12mm to 15mm deep Enclousures on AM25 with Waveguide fillet completly with Felt:
I would say better to stick with the 12mm Enclousures on the AM25 Waveguide!
15mm would makes more Problems around Resonancefrequencie.
The Measurement shows two different AM 25 in the Same two seperate Waveguides for each, with 12 and 15mm deep Enclousures.
And i was Replacing the Speaker for Measuring so that why i guess there some diferencies between the two AM 25 around 6,5 and 11,5kHz