HYBRID - a loudspeaker with dsp crossover

[Tangband]

Hi.
I will tell a little about a project that started in Sweden and in the beginning was a passive loudspeaker. The goals where to create a good loudspeaker with good directivity with driveunits that were good but not really expensive. This passive loudspeaker were not developed by me.
I bought the closed boxes from the inventor of the passive loudspeaker , and decided to develop an active dsp model with the same driveunits using a dbx pa2 dsp and tpa 3251 amplifiers from Aiyima. The name became HYBRID. Its a closed box loudspeaker that can be used by itself with Linkwitz transformer in a small room with lots of roomgain. Or as a main loudspeakers designed to play with dual subwoofers crossed at 80 Hz.
The drive units are seas er18rnx and a scanspeak ringradiator. The waveguide is a Monacor WG300 with a custom made adaptor made of mdf. Damping material is sheep wool.
Crossover frequency is 2,3 kHz linkwitz Riley 24 dB/oct.

 

[Tangband]

 

[abdo123]

SHOW US THE MEASUREMENTS

Also is the passive version for sale anywhere? it's gorgeous!

 

[sarumbear]

Why is the baffle inclined?

 

[Tangband]

 

[Tangband]

The tweeter…

 

[Tangband]

To be continued when there is more time

 

[eddantes]

Why is the baffle inclined?

I too wonder this... It forces the speaker to be placed low or the listener to be below axis - either can present challenges.

 

[Tangband]

I too wonder this... It forces the speaker to be placed low or the listener to be below axis - either can present challenges.

It is made to be placed on a wall-shelf, for instance underneath a big flatscreen. It can also be placed on loudspeakerstands thats about 50 cm high.
In the dsp version, the drivers are exactly timealigned in the crossover region, using dsp.

 

[Tangband]

Measurement 70 cm from one of the HYBRID on 50 cm stand, on axis, inroom in my listening room. Line audio OM 1 as mic this time.

 

[Tangband]

This is an erlier measurement during development of the crossover . The bass unit is slightly delayed ( 1 cm ) in dsp to get the crossover slopes symmetrical.
The measurement is done inroom, so the slopes are not so deep as it is when taking out the loudspeaker in the garden .

The trick is to invert one of the driveunits ( the ”wrong” way ) to se if the dip-slopes are symmetrical.
After this , I have the drivers back to ” correct” . It then should be flat at the crossover region. A lot of hours of listening tests later showed that a crossover at 2,3 KHz sounded the best .

 

[Tangband]

Some picture of the

rear on HYBRID and a picture of the Aiyima a04 tpa 3251.

 

[Tangband]

In an attemt to make the HYBRID better sounding, trying using a passive crossover made by mawes , I tried to make hybrid sound equal to my Genelec 8340.

The result was unfortunately slightly worse sound than with the active dsp filter . If 8340 is a 9 out of 10, a passive hybrid is 6 of 10.

I had to try though , thats the curse being a hifi entusiast ..

The genelecs tweeter is clearly a better one than in hybrid . Passive hybrid lacks detail in the sound .