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Multi-Way Conventional loudspeakers with crossovers

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Old 14th September 2019, 04:02 PM   #171
seanny is offline seanny  United States
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If we put 16 ohm version in a CD wave guide, do we have enough output or still have to pad down?
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Old 14th September 2019, 08:29 PM   #172
mark100 is offline mark100  United States
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Originally Posted by daemonsgr View Post
Reading other posts here plus your comment I think Ill go for the 16ohm.

Makes sense?
Makes sense to me
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Old 14th September 2019, 08:35 PM   #173
mark100 is offline mark100  United States
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Originally Posted by seanny View Post
If we put 16 ohm version in a CD wave guide, do we have enough output or still have to pad down?
I guess the question is, if we use the 16 ohm, do we still have too much output and need to pad down (attenuate).
I use very high efficiency mids and subs, and yes, I still need to attenuate the CDs.
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Old 14th September 2019, 08:51 PM   #174
Patrick Bateman is offline Patrick Bateman  United States
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Originally Posted by blossom View Post
This is something I have been thinking about recently.

Are we saying that a 16 ohm driver will have a 3db lower noise floor than a 8 ohm driver?
Yes.

For instance, I generally wire a resistor in series with a compression driver to lower the noise.

But it gets better!

A resistor in series with a tweeter also extends the highs.

Here's why:

Click the image to open in full size.

If you put an 4ohm resistor in series with an 4ohm tweeter, you would think that it would attenuate the tweeter evenly.

But it doesn't.

This is because of the impedance curve. For instance, this tweeter has an impedance of approximately 4ohm across it's range. That 4ohm resistor will attenuate that tweeter by approximately 6dB. But at 10khz, it's impedance has risen to 7ohm.

Due to this, the same resistor will only attenuate the tweeter by 4ohm at 10khz.

Does that make sense? Basically the net effect is that the resistor will raise the highs by a couple dB. The resistor attenuates the tweeter, but the attenuation isn't constant, it decreases at high and low frequency.

Read more here : adding resistor in series with tweeter in active sytem
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Old 21st September 2019, 08:53 PM   #175
Flaesh is offline Flaesh  Russian Federation
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SEOS24, ~2.8 V, Umik @ 1 m from mouth. And two-sample SPL comparison.
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Last edited by Flaesh; 21st September 2019 at 09:21 PM.
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Old 22nd September 2019, 06:09 AM   #176
Zvu is offline Zvu  Serbia
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It would be interesting to see how distortion looks at 95dB/1m also.

Consistency is very good. It looks quite workable. Still using PLLXO ?
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Old 22nd September 2019, 11:32 AM   #177
daemonsgr is offline daemonsgr  United Kingdom
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Quote:
Originally Posted by Flaesh View Post
SEOS24, ~2.8 V, Umik @ 1 m from mouth. And two-sample SPL comparison.
as a comparison I found a BMS 4594nd on SEOS24 (unspecified power level)
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Old 22nd September 2019, 05:23 PM   #178
Flaesh is offline Flaesh  Russian Federation
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Originally Posted by Zvu View Post
It would be interesting to see how distortion looks at 95dB/1m also.
@ 0.88 V. I can send you rew file))
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Old 22nd September 2019, 05:30 PM   #179
Flaesh is offline Flaesh  Russian Federation
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Originally Posted by daemonsgr View Post
as a comparison I found a BMS 4594nd on SEOS24 (unspecified power level)
I have BMS. Mark and Peter Morris have already written something about subjective comparison
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Old 22nd September 2019, 05:42 PM   #180
daemonsgr is offline daemonsgr  United Kingdom
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Originally Posted by Flaesh View Post
I have BMS. Mark and Peter Morris have already written something about subjective comparison
Any link to the info?
I have only seen the comment when he tried it in the MTM PA. (just one post with a photo)
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