Filtering a full range compound horn?

[brsanko]

A little question of opinion for the more experienced guys. I designed a compound horn for the Hivi B3N. As it sits the bass is flat down to only about 100hz, but it's pretty small so that isn't so bad. But the pass band of the rear horn models so sensitive that I doubt even a front horn could bring the mids and treble up to match. Now the bass has plenty of excursion left so that max spl is decent down to 55-60hz. My question is this: If I filter the frequencies between about 80hz and 400hz and bring them down to the level of everything else, would this sound good or would a filter have a big negitive effect on the dynamics and speed of the horn design?

[brsanko]

here's another pic.

[brsanko]

here's yet another pic.

[hm]

Hello brsanko,

did you listen without front horn?
Your horn throat sims very small?
Is the horn mouth bifurcated?
Better no filter, there is a lot of music,
Kammerton a = 440 Hz,
if you get this SPL why kill it with expensive parts,
may be no front horn helps enough.

nice design,

i made a small bookshelf sat horn for such driver,
i listen to it already with my sub double bass horn,
my experience shows that no bass for such single driver
is better in every way, movement goes down and mids and highs are better.

[brsanko]

I haven't actually built the speaker but I was looking for a design that was small enough for resale without a sub so bass is important. As for the front horn the 100-250hz region would be about 12db louder than everthing above it without it. At least according to the simulation, and they have proven pretty accurate in the builds I've done so far. For my own personal use I would avoid using filters perhaps using an EQ, but for a commercially viable design flat frequency response is pretty important I think. I'm just wondering what the negative affects of a filter would be. and yes it would be pretty expensive for the parts.

[brsanko]

The plot shown is only for the rear horn.

[brsanko]

actually I've come up wit a better design that gives lower bass without a filter in a similar sized cab so I guess the point is moot.

[Scottmoose]

Hmm. 'I was looking for a design that was small enough for resale' is not a phrase that exactly thrills me.

Don't get me wrong -I have nothing against a bit of capitalism, or small companies for that matter. Quite the reverse in fact. But when somebody comes onto a DIY forum, and asks for help / advice / information, one assumes it's for a DIY project. Where I for one, start to have a problem, is when somebody uses the forum to advertise commercial products, or, even worse, pump people for data they can / will potentially make money from. Assuming I'm not reading something into the above statement that isn't there, which does not appear to be the case, if you are considering selling examples of cabinets, exactly what is in it for us to assist you / advise you in any way with the designs? Are you going to pay us for our consulting time?

[SY]

If you gotta ask for design help at a diy forum, the likelihood of successful commercialization is small. So I wouldn't get too bent out of shape about it. Is anyone making any real money off of niche audio these days?

[Scottmoose]

A handful are / do, but I take your point mate -if people don't know the basics, it's a bit of a joke to think they can sell stuff successfully. That said, to my mind, the commercial aspect should still be clearly stated from the off -I for one don't like being made use of.

Anyway, subject closed as far as I'm concerned. I shall simply add brsanko to my ignore list.