I built a test baffle hybrid OB speaker and the driver order bottom to top is WMT. Is there a problem if I go WTM? The drivers ar Dayton RS270 (XO275) and Peeerless 830833? 6 1/2 inch mid 2500 to a SB29. The vocals sound like they are coming from too l ow in the speaker.
Thanks.
Thanks.
WTM will move the M and the W further apart, which is not a problem as long as the xover frequency is low enough (max. quarter wavelength centre to centre between the drivers @ xover frequency is a rough rule of thumb).
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Max distance between W and M
OK so the wavelength at 275 hz is 4.1 ft. Then a quarter wavelength is a foot. So does that mean the centers of the W and M can not exceed 12 inches?
OK so the wavelength at 275 hz is 4.1 ft. Then a quarter wavelength is a foot. So does that mean the centers of the W and M can not exceed 12 inches?
1. Your T needs to be roughly at ear level.
2. Keep woofer as close to floor as possible
3. You might try to place the M over the T while observing point 1 and 2
It won't be ideal crossed at 275 but it might still be lesser of the evils
And check out Lampizator P17
Endorphine from Kingston Kitchen
2. Keep woofer as close to floor as possible
3. You might try to place the M over the T while observing point 1 and 2
It won't be ideal crossed at 275 but it might still be lesser of the evils
And check out Lampizator P17
Endorphine from Kingston Kitchen
Rule violation
Ok if I do that the m would be very high up and violate the 1/4 wavelength spacing rule. I'll model it (edge)and see how it turns out.
Ok if I do that the m would be very high up and violate the 1/4 wavelength spacing rule. I'll model it (edge)and see how it turns out.
😕
Just when you really have some compatibily problem, such as ....
very low sensitivity woofer, so you'll get the' floor bounce effect' ( +3 dB)
But, just see how soundwaves expand, might not be a good POV to stay near the floor .
Not close to floor
I don't have the exact dimensions but i think the W is centered 14 inches off the floor and yes it is a sealed enclosure 2 cu ft. Thanks.
Since the baffles for the M and T are (1) independent and (2) on rails i can play around with them to some extent for trial and error. I just wanted to get some rules of thumb/recommendations as not to waste time doing something that is definitely wrong. Or at least if i did something wrong it would explain lousey results 🙄
I don't have the exact dimensions but i think the W is centered 14 inches off the floor and yes it is a sealed enclosure 2 cu ft. Thanks.
Since the baffles for the M and T are (1) independent and (2) on rails i can play around with them to some extent for trial and error. I just wanted to get some rules of thumb/recommendations as not to waste time doing something that is definitely wrong. Or at least if i did something wrong it would explain lousey results 🙄
WTM arrangement can change the sound.
Design OB is difficult although you do measurements and a good geometry study.
If you are doing something with your ears, you run into big troubles.
Take a look to these projects :
Dionysus
Acapella NEXTSEAS W22NY001 +
Crossovers could be as simple as boxed speakers.
Design OB is difficult although you do measurements and a good geometry study.
If you are doing something with your ears, you run into big troubles.
Take a look to these projects :
Dionysus
Acapella NEXTSEAS W22NY001 +
Crossovers could be as simple as boxed speakers.
Yes, I understand. I do have the ability to model and measure. I am no expert but I am learning. I have the patience to experiment.
Hi Jim,
Placing the tweeter beneath the midrange is always done for a purpose. It is a method for phase aligning where the shallower tweeter chassis is mounted beneath ear level thus placing it further from the listener and making it's sound arrive in phase with the midrange.
With tweeter on ear level there is potential danger of listening outside of speaker's focus especially with shallower crossover slopes.
It is considered that the axis of the speaker is the the one that starts from the geometric center between all drivers acoustic centers and runs in perpendicular line to sth... eg. it's direction is governed by speaker geometry.
While this is true for vintage 3 way speakers crossed around 800 and 4000 Hz, I don't find it applicable for modern 3 way speakers that tend to have very low first crossover point. Rather I would tend to consider that acoustic axis of the speaker is starting from the center of the line connecting the acoustic centers of the midrange and the tweeter. The axis would normally be perpendicular to the line connecting the acoustic centers in case of symmetric electrical crossover and linear impedance of drivers in the crossover region otherwise the axis is tilted towards the phase lagging driver.
Best Regards!
Placing the tweeter beneath the midrange is always done for a purpose. It is a method for phase aligning where the shallower tweeter chassis is mounted beneath ear level thus placing it further from the listener and making it's sound arrive in phase with the midrange.
With tweeter on ear level there is potential danger of listening outside of speaker's focus especially with shallower crossover slopes.
It is considered that the axis of the speaker is the the one that starts from the geometric center between all drivers acoustic centers and runs in perpendicular line to sth... eg. it's direction is governed by speaker geometry.
While this is true for vintage 3 way speakers crossed around 800 and 4000 Hz, I don't find it applicable for modern 3 way speakers that tend to have very low first crossover point. Rather I would tend to consider that acoustic axis of the speaker is starting from the center of the line connecting the acoustic centers of the midrange and the tweeter. The axis would normally be perpendicular to the line connecting the acoustic centers in case of symmetric electrical crossover and linear impedance of drivers in the crossover region otherwise the axis is tilted towards the phase lagging driver.
Best Regards!
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From time to time, I tested the WTM configuration on my system.
I always prefered the WMT, tweeter at ear level.
Despite some apparent advantages for the woofer being close to the floor (crossover at 160 Hz), I also prefer it to be close to the medium.
All that is only purely subjective preferences.
I always prefered the WMT, tweeter at ear level.
Despite some apparent advantages for the woofer being close to the floor (crossover at 160 Hz), I also prefer it to be close to the medium.
All that is only purely subjective preferences.
lost me 🙂
Hmm ok I followed you to a certain point and lost you. I got the part about phase/time alignment. I would need to delay the tweeter a bit so this may help.
Hmm ok I followed you to a certain point and lost you. I got the part about phase/time alignment. I would need to delay the tweeter a bit so this may help.
Yes, and a smaller distance (and steeper filter order) will only make things better. As you can see from this example, there is not much leeway with realistic drivers to do other than WMT.
Damned if i do
Yep to squeeze them together to minimize distance means the tweeter would be too low.
Yep to squeeze them together to minimize distance means the tweeter would be too low.
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