59L Tapped Horn

[BP1Fanatic]

I just saw this pic while talking to 1 of my co-workers.
The enclosure was in my 1983 Mercury Grand Marquis from 1995-2003.
I can't believe I still had this pic on my work laptop.

From my phone.

 

[BP1Fanatic]

If the two isobaric drivers are connected electrically in parallel, as is the case for the design being considered here, then Bl does not change.

If they are connected electrically in series, then Bl doubles.

When wiring 4 drivers, what happens to the BL then?

Series-Parallel = ?
Parallel-Series = ?

I always choose to do Series-Parallel.

With two 8ohm drivers, which scenario provides the best performance, double BL (16ohm) or double amplifier power (4ohm)?

 

[Booger weldz]

Look at the suspension on that mtx driver ?

the suspension stiffness is non existent 😱

 

[maxolini]

🤣😜😂

 

[David McBean]

When wiring 4 drivers, what happens to the BL then?

Series-Parallel = ?
Parallel-Series = ?

Given that you have been told that Bl doubles for two drivers connected in series but stays the same for two drivers connected in parallel, it should be be possible for you to work out the answer.

For the loudspeaker design you posted there are four possible ways that the drivers can be symmetrically connected, as shown in the attachments. The resulting overall Bl values for the four configurations are:

2S 2s = 4 * Bl
2P 2s = 2 * Bl
2S 2p = 2 * Bl
2P 2p = 1 * Bl

With two 8ohm drivers, which scenario provides the best performance, double BL (16ohm) or double amplifier power (4ohm)?

What does Hornresp say?

 

[David McBean]

Look at the suspension on that mtx driver ?

the suspension stiffness is non existent 😱

???

Given that:

Sd = 791.73 cm^2
fs = 21 Hz
Vas = 421.92 litres
Qes = 0.5
Qms = 3.84

Then compliance Cms = 4.72E-04 m/N

Stiffness = 1 / Cms = 2118.64 N/m

 

[BP1Fanatic]

2S 2s = 4 * Bl
2P 2s = 2 * Bl
2S 2p = 2 * Bl
2P 2p = 1 * Bl

That's exactly how I was thinking.

 

[Booger weldz]

???

Given that:

Sd = 791.73 cm^2
fs = 21 Hz
Vas = 421.92 litres
Qes = 0.5
Qms = 3.84

Then compliance Cms = 4.72E-04 m/N

Stiffness = 1 / Cms = 2118.64 N/m

Sorry, I meant when compared to the 2024 ‘car audio’ equivalent 15” with a vas of 80 liters or so

 

[Booger weldz]

That's exactly how I was thinking.

It’s deceiving because ‘Bl’ alone doesn’t help me compare anything like ‘Bl^2/Re’ ?

 

[BP1Fanatic]

Sorry, I meant when compared to the 2024 ‘car audio’ equivalent 15” with a vas of 80 liters or so

I would hope all 2024 car audio drivers would be an improvement over MTX's lowest model driver from 1993.

 

[Booger weldz]

this stuff has me baffled(no pun intended😀)

wow! Try finding a design for this?

 

[maxolini]

Wtf!! BL=38!!!

 

[Booger weldz]

(38.24^2)/2.17

675 motorforce score? What ‘beats’ that?

 

[BP1Fanatic]

🤣😂🤣😂

 

[BP1Fanatic]

Try finding a design for this?

What is the 12" driver's name and model number?

I need to know the mounting depth, watts rms, and Xmax.

 

[Booger weldz]

It’s 10” deep, xmax is 30 plus mm and power is a few thousand watts

 

[GM]

this stuff has me baffled(no pun intended😀)

wow! Try finding a design for this?

Compression horn or misaligned TH.

 

[Gtimes]

this stuff has me baffled(no pun intended😀)

wow! Try finding a design for this?

Is it just a super short coil? I'm struggling to understand how they got that much motor force without a even hung coil setup or similar

 

[BP1Fanatic]

Look at the size of the magnet structure!

 

[BP1Fanatic]

https://ddaudio.com/series/z4/