Omnes Audio BB4.AL

[k.p.]

Heeft iemand deze al gezien? OA BB4.AL
Hij heeft wel wat weg van een Mark Audio vind ik. Helaas heb ik nog metingen gevonden.

[Vuurkat]

Da's de BB4.AL, dit is de BB3.AL.

Ik heb er zelf geen ervaring mee, maar hier wordt gezegd dat het gewoon een Duitse versie is van de Markaudio CHR-70 en dan een beetje anders:

There's a "tweak" on the cone to give the BB's a slightly more smoooooth tone. A tiny change, nice.

[Henkjan]

Het verschil is idd de kleur, verder is het gewoon een CHR-70.

[]eep]

Ja, ik had ze al gezien. En ja, het is gewoon een Markaudio.

Maar...

Als ik op DIY-audio lees wat Mark er zelf over zegt is het niet helemaal dezelfde als de originele CHR-70 (2009) maar zijn de nieuwere CHR-70 aangepast.

There's a "tweak" on the cone to give the BB's a slightly more smoooooth tone. A tiny change, nice.

Cheers

Mark.



Nick and Thorsten at Blue Planet Acoustic in Frankfurt evaluated the first model CHR-70 early in 2009. They liked the driver but wanted a tweak in the high range to create a flatter response. I'd already started work on my Multiform cone making process so the timing worked out well. Subsequently, the CHR models using Multiform cones have the flatter response including the BB4.

The BB4 has a "tweaked" rear suspension which gives a modest increase in constant linear oscillation at ranges 2.20-mm to 3.55-mm (1 way). I've done this to assist the growing interest from younger DIYer's experimenting with computer sourced material, DSP and Near-field applications via Chip and class D amplification.

I should let folks know that Blue Planet Acoustic has a CHP-70 driver with the similar rear suspension to the BB4 (0.1/50g@+/-0.075 stiffness difference). This driver can be recognised by its black frame. The first model CHP-70 has the cream coloured frame so its easy to identify the different models.

From memory, Nick will market these drivers through his "Omnes" brand line. I think Nick will make these drivers available world-wide but best to contact them direct: Omnes Audio Loudspeaker - Contakt

Cheers

Mark.


Good question. Longer mechanical oscillations are slightly more efficient on BB4 and CHP-70. The difference from the CHR-70 is minor but each little tweak in usually worth having. Sonically, the tweak gives these driver slightly more low range (LF) capability (depending on box optimisation). For example, an orchestra's or band's large percussion (drums) will be reproduced slightly more accurately.
The tweak doesn't turn these drivers automatically into mini-woofs, but it does mean they are bass capable in a suitable box design. There's potential for driver and system to reasonably operate down to around the mid 30-Hz.

There's allot of chat on this subject on:

My CHR-70+DSP Linkwitz Transform experiment (4" driver playing flat to 20hz!)

Cheers

Mark