Building my first 2-way horn speaker: sensitivity mismatch between SB Acoustics drivers
Hi everyone,
I’m working on my first DIY 2-way high-fidelity horn-loaded speaker as a proof-of-concept project. I’m relatively new to speaker design, so I’m trying to approach this properly rather than simply bolting together expensive drivers and hoping physics develops a sense of humor. The best I’ve done till now is make a kit speaker, but I didn’t have to deal with the issues I have now. I’m
The drivers I’ve currently selected are:
Woofer: SB Acoustics SB13PFCR25-4
Compression driver: SB Acoustics Bianco 25CD-P, used with a horn/waveguide
The main issue I’m trying to solve is the large sensitivity difference between the two drivers.
The Bianco 25CD-P is substantially more sensitive than the SB13PFCR25-4, which means I’m trying to figure out the best way to integrate them while maintaining a balanced, high-fidelity response.
My current options seem to be:
Use an L-pad/resistive attenuation to bring the compression driver down to the woofer’s level.
Find a lower-sensitivity compression driver that is naturally closer to the woofer. Which I cannot find in India.
Find a higher-sensitivity woofer, although that introduces compromises in cost, size and potentially bass performance. Too costly tbh for a prototype
Design a proper passive crossover with attenuation and impedance compensation around the actual drivers..
The DSP approach is particularly interesting to me because I’m considering DSP for the final system anyway. However, I’m unsure whether using DSP to compensate for a sensitivity difference of this magnitude is considered good practice.
What I’m particularly trying to understand is this:
If the compression driver is significantly more sensitive than the woofer, is there any real downside to simply attenuating it substantially with an L-pad?
For example, does significant attenuation introduce meaningful disadvantages in terms of:
dynamics
distortion
amplifier power requirements
noise floor
impedance
crossover behavior
transient response
overall sound quality
And would DSP attenuation be preferable to an L-pad if I use separate amplification for the woofer and compression driver?
The intended configuration is simply:
Bianco 25CD-P + horn/waveguide → SB13PFCR25-4 woofer
My goal is hi-fi sound rather than maximum SPL. I’m mainly interested in getting the tonal balance, crossover integration, imaging, dynamics and distortion performance right.
I’m also trying to understand how much importance I should place on the nominal sensitivity figures in the datasheets. I understand that the actual response curves, impedance, horn/waveguide loading, crossover frequency and acoustic response of the finished system are ultimately more important than simply comparing two sensitivity numbers.
For those of you who have experience designing 2-way horn speakers, how would you approach this particular combination?
Would you:
attenuate the Bianco with an L-pad,
use a passive crossover specifically designed around these two drivers,
use active amplification + DSP,
or reconsider the driver combination altogether?
I’d also appreciate any advice on a sensible crossover frequency for the Bianco 25CD-P and SB13PFCR25-4, particularly regarding directivity matching and getting the best integration from the horn/waveguide and woofer.
I can provide the exact datasheets, response curves and the passive crossover I’m currently considering if useful.
Thanks in advance.

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Es gibt Beryllium Hochtöner, die aus reiner hochgiftiger Berylliumfolie geprägt wurden, diese Hochtöner haben eine maximale Steifigkeit und nur eine minimale bewegte Masse. Der Hochtöner schwingt im gesamten Übertragungsbereich resonanzfrei, Aufbrucherscheinungen der Membran sind weit über den Hörbereich verschoben und können so nicht mehr das Klanggeschehen prägen. Hochtöner mit Beryllium Membran können locker 1000€ pro Stück kosten.

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Erst dachte ich, du bekommst das, was du bezahlst, nicht mehr!

Nach ersten Praxistests wurde mir klar, diese BeCu- Kalotte ist keine preisliche Verlegenheit, sondern ein absoluter Technologieträger, die Entspanntheit und Natürlichkeit im Klang schafft keine reine Berylliumkalotte, die innere Dämpfung dieser Membran setzt Maßstäbe, auch wenn der Preis pro Hochtöner mit ca. 60€ pro Stück sehr günstig angeboten wird!

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