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diyhifisupply®

The Crescendo (Grande) Speaker System

1 Introduction and Overview

High   Efficiency,   friendly   size,   reasonable   bandwidth   and   good 
sound. SET friendly. Impossible dream? 

Unfortunately   horns   with   any   bandwidth   are   the   size   of   a 
refrigerator. So…we have developed a horn ribbon based system 
which achieves our goals. The wide band horn ribbon covers from 
about 600hz to 23khz. The special carbon fiber reinforced paper 
cone   cast   frame   8”   Driver   covers   below   that,   using   1st   order 
(phase-coherent) crossovers. 

The   600Hz   Crossovers   uses   extreme 
quality parts: all film caps, oil paper and 
copper   foil   inductors,   Silver   Wire, 
Kiwame Resistors etc.

The   Systems   sensitivity   is   an   honest 
98db/w (100db in room as specified by 
many   speaker   manufacturers),   nomi-
nally 8 ohms. The box is 30L and covers 
from about 60hz to 23khz in room. The 
Crescendo   can   be   used   with   many 
commercial   Subwoofers   to   extend   the 
low frequency response.

The   -6dB   coverage   angle   for   the 
Crescendo   HF   50   degrees   horizontal 
and 30 degrees vertical. Such controlled dispersion over such a 
wide   frequency  range   ensures   that   even   in   acoustically  difficult 
rooms   and   the   midrange   and   treble   remain   from   excessive 
reflections and room reverb.

There is an option for bass modules – making the Crescendo into 
the   the   Crescendo   Grande   System.   We  wanted   a   cabinet   that 
could slip under the Crescendos and take the place of the stand. 
For   this   a   really   beefy,   quick   bass   driver   was   needed,   which 
happens to be exactly what the DynaFone is. The cabinet is about 
50L and tuned to cover down to 25hz flat.

Also needed was lots of power to drive the bass modules. We use 
some high quality plate Amplifiers which give us about 250w in a 

small footprint integrated into 
the   woofer   cabinet.   This 
bass system has no problem 
keeping   up   with   the   Cres-
cendo horn ribbons while at 
the   same   time   giving   up 
really   clean   earthquake 
tones in our 170m

2

 shop.

How   does   it   sound?   The 
dynamics   from   this   combo 
are   pretty   scary   at   times. 
Since   the   ribbon   is   horn 
loaded, wideband and closed 
on   the   back   (doesn’t   need 
nor   use   the   box)   it   gives 
Electrostatic   levels   of   trans-
parency and immediacy, and 
the coherence of a full-range 
driver. 

Summary of Contents for Crescendo

Page 1: ...diyhifisupply The Crescendo Grande Speaker System ...

Page 2: ... DRIVER SPECIFICATIONS 2 3 DYNAFONE SUBBASS DRIVER SPECIFICATIONS 3 CRESCENDO ENCLOSURE DESIGNS 3 1 CRESCENDO 2 WAY 3 2 CRESCENDO SUBWOOFER 4 CRESCENDO CROSSOVER AND CONNECTIONS 4 1 CRESCENDO 2 WAY CROSSOVER 4 2 CRESCENDO SUBWOOFER CONNECTIONS 5 CRESCENDO ASSEMBLY PICTORIAL 6 CRESCENDO CONNECTIONS AND SETUP 6 1 CRESCENDO SETUP 6 2 CRESCENDO CONNECTIONS 7 TECHNICAL DATA ...

Page 3: ...ontal and 30 degrees vertical Such controlled dispersion over such a wide frequency range ensures that even in acoustically difficult rooms and the midrange and treble remain from excessive reflections and room reverb There is an option for bass modules making the Crescendo into the the Crescendo Grande System We wanted a cabinet that could slip under the Crescendos and take the place of the stand...

Page 4: ...rim edge Cone Material Aluminium Alloy Impedance 6Ohm Power Handling 50W continous 100W programme Xmax 3mm peak peak Re 5 2 Ohm Moving Mass 19 5 gramm Fs 90Hz Qts 0 45 Spl 2 83V 1m 98db Rec Enclosure 30 Liter Net Volume 70 Hz Port Tuning 110cm2 port crossection 13cm port length Frequency AND Impedance Response in recommended enclosure ...

Page 5: ...er System 2 2 Crescendo HF Driver Specifications Dimensions 220mm X 275mm Waveguide Material Aluminium Alloy Diaphragm Material Kapton Ribbon Surface 91cm2 Fs 480Hz Impedance 6Ohm Power Handling 60W continous 120W programme Spl 2 83V 1m 102db ...

Page 6: ... Cone Material Aluminium Alloy Impedance 8 Ohm Power Handling 200W continous 400W programme Xmax 14mm peak peak Re 7 6 Ohm Moving Mass 75 gramm Fs 35Hz Qts 0 34 Spl 2 83V 1m 87 5db Rec Enclosure 33 Liter Net Volume 26 Hz Port Tuning 110cm2 port crossection 95cm port length Frequency AND Impedance Response in recommended enclosure ...

Page 7: ...th good filling properties is recommended for any of the wood materials Grip Fill the professional version of liquid nails or similar work well as can resin based glues Stone requires special glues The Back Panel is kept removable to allow the low frequency drivers to be mounted from behind Unless you wish to use an external enclosure for your crossover building it on the removable back panel allo...

Page 8: ...he Crescendo 2 way speaker Make sure all seams etc are well sealed Again you can choose other mechanical arrangements as long as you keep the volume and port cross section as well as port length The Plate Amplifier is mounted into the side of the enclosure in a suitable cutout The Amplifier includes the necessary sealing strips to make sure the mounting is air tight and the correct mounting screws...

Page 9: ...y The Crescendo Grande Speaker System 4 Crescendo Crossover and connections 4 1 Crescendo 2 Way Crossover The Crossover is as shown below One possible way to assemble this crossover is shown on the right hand side ...

Page 10: ... times the power to to allow the subwoofer to match the Crescendo 2 Way We generally do not recommend to use line level feeds or active crossovers instead simply connect the speaker level feed via an adapter cable as shown to the RCA Input L or R does not matter The final crossover and level settings for the Subwoofer depend at least to a degree on room size and personal preference As a starting p...

Page 11: ...diyhifisupply The Crescendo Grande Speaker System 5 Crescendo Assembly Pictorial ...

Page 12: ...diyhifisupply The Crescendo Grande Speaker System ...

Page 13: ...diyhifisupply The Crescendo Grande Speaker System ...

Page 14: ... sound quality but is essentially to keep the speakers from wandering about We recommend spikes or cones Equally it is essential to create an interface between Subwoofer and 2 Way that is rigid or at least prevents 2 Ways from moving e g small patches of blue tack 6 2 Crescendo Connections As designed the Crescendo 2 Way has binding pots for bi wiring If you do not use Bi Wiring speaker cables you...

Page 15: ...diyhifisupply The Crescendo Grande Speaker System You also need to connect the inputs of the subwoofer amplifier as shown in the example below ...

Page 16: ...r with electronic crossover Midrange One 8 inch 21 cm Carbon Fiber Paper Tweeter One 14in2 91cm2 magnetic planar driver Sensitivity 98 dB 2 83V one meter 1 kHz Impedance 8 ohms 5 ohms minimum 300 Hz Frequency Resp 3 dB 26 Hz 20kHz Min rec power 2 watts per channel Overall Dimensions Height 110 cm w o spikes Width 25 6 cm Depth 35 6 cm ...

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