hello all,

I like to build a MTM style center speaker.

I need the speaker to be 8 ohm.

Can I use an 8 ohm tweeter and two 8 ohm midwoofers? I will use a 2nd
order crossover for this.

When I draw this combination out I get 2.6 ohms, ie., wire the two 8
ohm mids in parallel and then wire tweeter in parallel with the mids.

Another I way is to wire the two mids in series and then wire the
tweeter parallel with the mids. This would give me 5.3 ohms.

I guess I can use one 16 ohm tweeter and two 8 ohm mids in parallel
but all the 2nd order crossover schematics I looked at showed people
using only 8 or 6 ohm speakers.

My power amp will handle only 6 to 16 ohms.

Can anyone please help me?

Thanks.

bob wrote:
hello all,

I like to build a MTM style center speaker.

I need the speaker to be 8 ohm.

Can I use an 8 ohm tweeter and two 8 ohm midwoofers? I will use a 2nd
order crossover for this.

When I draw this combination out I get 2.6 ohms, ie., wire the two 8
ohm mids in parallel and then wire tweeter in parallel with the mids.

Another I way is to wire the two mids in series and then wire the
tweeter parallel with the mids. This would give me 5.3 ohms.

I guess I can use one 16 ohm tweeter and two 8 ohm mids in parallel
but all the 2nd order crossover schematics I looked at showed people
using only 8 or 6 ohm speakers.

Use two 4-Ohm mids in series -- as an 8 Ohm midwoofer -- plus
an 8-Ohm tweeter. Then use a crossover that expects 8-Ohm
speakers.

bob wrote:
hello all,

I like to build a MTM style center speaker.

I need the speaker to be 8 ohm.

Can I use an 8 ohm tweeter and two 8 ohm midwoofers? I will use a 2nd
order crossover for this.

When I draw this combination out I get 2.6 ohms, ie., wire the two 8
ohm mids in parallel and then wire tweeter in parallel with the mids.

Another I way is to wire the two mids in series and then wire the
tweeter parallel with the mids. This would give me 5.3 ohms.

I guess I can use one 16 ohm tweeter and two 8 ohm mids in parallel
but all the 2nd order crossover schematics I looked at showed people
using only 8 or 6 ohm speakers.

Use two 4-Ohm mids in series -- as an 8 Ohm midwoofer -- plus
an 8-Ohm tweeter. Then use a crossover that expects 8-Ohm
speakers.

bob wrote:
hello all,

I like to build a MTM style center speaker.

I need the speaker to be 8 ohm.

Can I use an 8 ohm tweeter and two 8 ohm midwoofers? I will use a 2nd
order crossover for this.

When I draw this combination out I get 2.6 ohms, ie., wire the two 8
ohm mids in parallel and then wire tweeter in parallel with the mids.

Another I way is to wire the two mids in series and then wire the
tweeter parallel with the mids. This would give me 5.3 ohms.

I guess I can use one 16 ohm tweeter and two 8 ohm mids in parallel
but all the 2nd order crossover schematics I looked at showed people
using only 8 or 6 ohm speakers.

Use two 4-Ohm mids in series -- as an 8 Ohm midwoofer -- plus
an 8-Ohm tweeter. Then use a crossover that expects 8-Ohm
speakers.

Use two 4-Ohm mids in series -- as an 8 Ohm midwoofer -- plus
an 8-Ohm tweeter. Then use a crossover that expects 8-Ohm
speakers.


Thank you for your reply.

So now the high pass(tweeter) is 8 ohm and the low pass is now 8 ohm.

When you look at the schematic of the 2nd order crossover the low
pass(tweeter)(+) terminal is connected to the high pass (mid)(+)
terminal and the same with the (-) terminal.

for example:

(+)-------------
| |(+)
| tweeter
| |(-)
| |
| |
--|(+) |
mid |
|(-) |
|(+) |
mid |
|(-) |
| |
(-)--------------



Are you not essentially connecting in parallel, which you would end up
with 4 0hm?

Please tell me if I got this incorrect?

Thanks.

Use two 4-Ohm mids in series -- as an 8 Ohm midwoofer -- plus
an 8-Ohm tweeter. Then use a crossover that expects 8-Ohm
speakers.


Thank you for your reply.

So now the high pass(tweeter) is 8 ohm and the low pass is now 8 ohm.

When you look at the schematic of the 2nd order crossover the low
pass(tweeter)(+) terminal is connected to the high pass (mid)(+)
terminal and the same with the (-) terminal.

for example:

(+)-------------
| |(+)
| tweeter
| |(-)
| |
| |
--|(+) |
mid |
|(-) |
|(+) |
mid |
|(-) |
| |
(-)--------------



Are you not essentially connecting in parallel, which you would end up
with 4 0hm?

Please tell me if I got this incorrect?

Thanks.

Use two 4-Ohm mids in series -- as an 8 Ohm midwoofer -- plus
an 8-Ohm tweeter. Then use a crossover that expects 8-Ohm
speakers.


Thank you for your reply.

So now the high pass(tweeter) is 8 ohm and the low pass is now 8 ohm.

When you look at the schematic of the 2nd order crossover the low
pass(tweeter)(+) terminal is connected to the high pass (mid)(+)
terminal and the same with the (-) terminal.

for example:

(+)-------------
| |(+)
| tweeter
| |(-)
| |
| |
--|(+) |
mid |
|(-) |
|(+) |
mid |
|(-) |
| |
(-)--------------



Are you not essentially connecting in parallel, which you would end up
with 4 0hm?

Please tell me if I got this incorrect?

Thanks.

On 2 Jan 2004 10:39:16 -0800, (bob) wrote:


Use two 4-Ohm mids in series -- as an 8 Ohm midwoofer -- plus
an 8-Ohm tweeter. Then use a crossover that expects 8-Ohm
speakers.


Thank you for your reply.

So now the high pass(tweeter) is 8 ohm and the low pass is now 8 ohm.

When you look at the schematic of the 2nd order crossover the low
pass(tweeter)(+) terminal is connected to the high pass (mid)(+)
terminal and the same with the (-) terminal.

for example:

(+)-------------
| |(+)
| tweeter
| |(-)
| |
| |
--|(+) |
mid |
|(-) |
|(+) |
mid |
|(-) |
| |
(-)--------------



Are you not essentially connecting in parallel, which you would end up
with 4 0hm?

No, because the crossover greatly increases impedance outside the pass
band, hence at low frequencies the tweeeter section has a very high
impedance. The nominal impedance of the whole speaker remains at 8
ohms.
--

Stewart Pinkerton | Music is Art - Audio is Engineering

On 2 Jan 2004 10:39:16 -0800, (bob) wrote:


Use two 4-Ohm mids in series -- as an 8 Ohm midwoofer -- plus
an 8-Ohm tweeter. Then use a crossover that expects 8-Ohm
speakers.


Thank you for your reply.

So now the high pass(tweeter) is 8 ohm and the low pass is now 8 ohm.

When you look at the schematic of the 2nd order crossover the low
pass(tweeter)(+) terminal is connected to the high pass (mid)(+)
terminal and the same with the (-) terminal.

for example:

(+)-------------
| |(+)
| tweeter
| |(-)
| |
| |
--|(+) |
mid |
|(-) |
|(+) |
mid |
|(-) |
| |
(-)--------------



Are you not essentially connecting in parallel, which you would end up
with 4 0hm?

No, because the crossover greatly increases impedance outside the pass
band, hence at low frequencies the tweeeter section has a very high
impedance. The nominal impedance of the whole speaker remains at 8
ohms.
--

Stewart Pinkerton | Music is Art - Audio is Engineering

On 2 Jan 2004 10:39:16 -0800, (bob) wrote:


Use two 4-Ohm mids in series -- as an 8 Ohm midwoofer -- plus
an 8-Ohm tweeter. Then use a crossover that expects 8-Ohm
speakers.


Thank you for your reply.

So now the high pass(tweeter) is 8 ohm and the low pass is now 8 ohm.

When you look at the schematic of the 2nd order crossover the low
pass(tweeter)(+) terminal is connected to the high pass (mid)(+)
terminal and the same with the (-) terminal.

for example:

(+)-------------
| |(+)
| tweeter
| |(-)
| |
| |
--|(+) |
mid |
|(-) |
|(+) |
mid |
|(-) |
| |
(-)--------------



Are you not essentially connecting in parallel, which you would end up
with 4 0hm?

No, because the crossover greatly increases impedance outside the pass
band, hence at low frequencies the tweeeter section has a very high
impedance. The nominal impedance of the whole speaker remains at 8
ohms.
--

Stewart Pinkerton | Music is Art - Audio is Engineering

No, because the crossover greatly increases impedance outside the pass
band, hence at low frequencies the tweeeter section has a very high
impedance. The nominal impedance of the whole speaker remains at 8
ohms.

So, if you have two 16 ohm mids connected in parallel in the low pass
and 8 ohm tweeter, you can also have an 8 ohm speaker?

No, because the crossover greatly increases impedance outside the pass
band, hence at low frequencies the tweeeter section has a very high
impedance. The nominal impedance of the whole speaker remains at 8
ohms.

So, if you have two 16 ohm mids connected in parallel in the low pass
and 8 ohm tweeter, you can also have an 8 ohm speaker?

No, because the crossover greatly increases impedance outside the pass
band, hence at low frequencies the tweeeter section has a very high
impedance. The nominal impedance of the whole speaker remains at 8
ohms.

So, if you have two 16 ohm mids connected in parallel in the low pass
and 8 ohm tweeter, you can also have an 8 ohm speaker?