series bsc

[PeteMcK]

Will this work?
trying to use two 4 ohm drivers...

[AllenB]

I'm thinking it will short W1 down to DC.

[PeteMcK]

yep, It won't work....
I think I'm either going to have to go 2 way, or Bi-amp (trying to go 2.5 way with 4 ohm drivers)

[kipman725]

wire both drivers in series and apply standard BSC circuits (inductor+resistor in parallel connected to load). Alternativly 2nd order low pass one of the drivers such that it corrects the baffle step, down side of this is presenting an efective 2ohm load at bass frequancies to the amp.

[picowallspeaker]

Hey !!! I was just thinking about this today
But ,excluding the tweeter , I was wondering about two (equal ?) 4 " ,one boxed (TL) and the other on top (OB ? ). Of course the (eventual ) series crossover between the two would take into account for BSC .

[planet10]

I've struggled with just 2 FRs in series. With a typical voltage source amp, you get one driver rolling off up high, but below cutoff you have an 8 ohm speaker with x watts output. Above the cutoff you have 4 ohms so amp output is ~2x watts so the SPL levels above & below cutoff is ~ the same. You do have less cone excursion & 2x the Sd below cutoff.

Now if you have an amp that has approx the same output into 4 or 8 ohm (ie a typical transformer coupled tube amp), you get 3 dB extra below the cutoff from the doubling of the drivers.

So lets say it works if you have a tube amp since 6 dB BSC is too much.

dave

[picowallspeaker]

Mmmmhh.I changed my mind
Maybe ...1.5 way ,with a very strong notch on some driver

[planet10]

... and to finish my post... if you have a current amp, you get full 6 dB BSC

dave

[picowallspeaker]

Gotta try it !!

Originally Posted by planet10

... and to finish my post... if you have a current amp, you get full 6 dB BSC

dave

Might also a high value cap before the woofer do the 'job' , like raising a little Fc for better Df ?! Just talking about a single woofer .
For 1.5 way ,it may be interesting of having two equal drivers, different modded ...