Bromo/Fidelia hybrid Bookshelf speakers DIY (pictures /measurements inside)

[daniboun]

Hi amigos,

I'm back with a little DIY project to keep me busy during my lonely moments lol
I had the opportunity to acquire a pair of Crossover speakers from the excellent Fidelia bookshelf speakers by Audiofirstdesigns.
Since I had a pair of cabinets at home and the original kit is awaiting delivery, I embarked on a hybrid Bromo/Audiofirst Designs project.
As you robably know, the Fidelia speakers feature a pair of SB15CAC30-4 woofers and SB26CDC-C000-4 tweeters.

Note that the cabinets I offer here have excellent acoustic insulation. They are internally composed of a 3mm Alubutyl (Anti-vibration rubber with an external aluminum layer
) + a 30mm of acoustic foam.
You can't tell from the pcitures , but the crossover is really huge: 118 mm x 234 mm!! I had a lot of trouble positioning it optimally in the speakers.

SPEC :

Cabinet dimension : 320mmx240mmx200mm
18mm MDF / Walnut finish
Audiofirst designs Fidelia Crossover
SB Acoustics SB26CDC-C000-4 + SB15CAC30-4


Measurements and pictures:

Please note :
Ambient curve = Green > is supposed to show room interaction by gating the response to 8ms
Raw Curve = Yellow > Full FFT, information is displayed without any filtering. Everylittle detail, reflex and phase cancellation is visible
Anechoic curve = Blue > is supposed to remove room interference by gating the response to 4ms.
RTA : Real time Analyser, shows the frequency response in one place, with 1/3 octave resolution.


My Listening room :

Some mesurements :

Wiim RoomFit with Dayton Audio calibrated mic :

XTZ Analyser Pro Ambient:

XTZ Analyser RTA (real time)

XTZ Analyser Pro Multi Measurements

Ambient curve = Green
Raw Curve = Yellow (Full FFT)
Anechoic curve = Blue

 

[darakon]

Hello Daniboun,

well done DIY-Project.
Good SB-Drivers and well executed Walnut finishing!

Just this inroom measurements and heavy correction I don't understand.
Not sure, if this is really improving the sound.

Best regards!

 

[daniboun]

Hello Daniboun,

well done DIY-Project.
Good SB-Drivers and well executed Walnut finishing!

Just this inroom measurements and heavy correction I don't understand.
Not sure, if this is really improving the sound.

Best regards!

I need to perform a multi point measurements.
Indeed, I have an inexplicable difference between the Wiim Room measurements and those of the XTZ Pro analyzer. Yet both my microphones are calibrated to ±1dB...

In any case, the main point of this DIY project is to get an idea of the difference between the original Fidelia project, which has SOTA measurements, and my DIY cabinets... As soon as I receive my. Fidelia cabinets, I'll be able to compare them.

In any case, the speakers sound really good with my SVS 1000 Pro subwoofer.)

 

[Scrivs]

Nice job daniboun!
I like the clean, no-nonsense approach

 

[daniboun]

I like the clean, no-nonsense approach

I admit it, lol. )
At least it's a good pastime considering I have absolutely no patience... I should receive the Fidelia cabinets in a week and I'll take several multi-point measurements to compare them to my DIY cabinets.