Jeg holder en knapp på BIB. I forhold til bakladet horn så har den mindre fotavtrykk, kan plasseres nærmere bakvegg, er ekstremt mye lettere å bygge og sist men ikke minst, har mye dypere bass. En BIB er veldig høy, men det gjør vel ikke no? Kona sier hun foretrekker høye og mørke.....eehh med litt grått i etterhvert
Her er et klipp fra DIYAUDIO jeg har tatt vare på. Tror det var fra en Nordmann??
Fostez fe168Z Bib
The Fostex FE168EZ driver is the topic of many forum threads, but using a filter with them is to many a big no-no. In my opinion they need a filter correction consisting of two series-notch filters at 2.5 and 7kHz. Without, they sound harsh (try playing Shakira...) and high-range sounds like a really cheap tweeter. First I tried a baffle-step correction to reduce the harshness, but this doesn't really solve the main problems. With notch filters, soundstaging is improved, it now sounds balanced and crisp, detailed and dynamic with deep bass. This is in a BIB, but should apply to other forms of rear-loaded horns. Best of all is that you don't loose any efficiency.
Filter component values: Notch2.5kHz: 0.6mH + 20R + 6.8uF all in paralel. Notch7kHz: 0.25mH + 20R + 2.2uF in paralel. The two notches are then both placed in series with the speaker. Use low-tolerance components (coils and caps)!
Does not need a front supertweeter in my opinion, as this can create problems with lobing. Off-axis response is very good for a 6.5inch fullrange.
I recommend to all to try the notch filters! If you want measurements and simulations of the filters in Speakerworkshop format, please mail me.
