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Multi-Way Conventional loudspeakers with crossovers

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Old 10th October 2012, 04:24 PM   #31
Dissi is offline Dissi  Switzerland
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I hope davidel94 is only occupied to measure the Qts of his woofers. It was only an assumption, the driver will have a Qts around 1, as cheap drivers often have. Let's wait on the results.

Another method to find out Qts is to use LIMP:

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Old 24th October 2012, 02:14 PM   #32
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hi sorry if i disappeared but i had some school's exams, i will do the Qts test the 1st or 2nd of november
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Old 30th October 2012, 12:57 AM   #33
Dissi is offline Dissi  Switzerland
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The review of the tweeter Monacor HT22/8 is now online:

Test Lautsprecherchassis Hochtöner - Monacor HT22/8 -
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Old 30th October 2012, 01:20 AM   #34
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Quote:
Originally Posted by sreten View Post
Hi,

In this case active bi-amping is a waste of time and money.

The passive filter functions you need are nothing like the
active filter functions provided by "off the shelf" x/o's.

The tweeter is most probably designed to have a single
series capacitor giving you a 3rd order acoustic roll-off.
(True for nearly all cheap (high Fs) tweeters.)

You just put this in parallel with the bass/ mid. The simple
treble x/o usually means the skill is getting the bass/mid
to match with proper BSC and complementary x/o point.

rgds, sreten.

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Old 1st November 2012, 11:58 AM   #35
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I hope the values i found are right they are :
resonance frequency = 60Hz
Qms=1.47
Qes=0.60
Qts=0.43
so what kind of enclosures do you think will be perfect for this woofer and the tweeter remembering that the tweeter behind is sealed?
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Old 1st November 2012, 01:36 PM   #36
Dissi is offline Dissi  Switzerland
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To answer the question of the enclosure, you need to know one more parameter of the driver: Vas (or Mms). But assuming Vas=23.4 litres (Mms=20g), you have to choose a bass reflex box of 16-20 litres. The minimum vent diameter is 60 mm and the length around 100 mm. You seem to be a very lucky guy. You didn't have any idea buying the two drivers, but they fit. As far as I can see, I even predict, that the result without any additional equalizing will be already quite good!

If you have a free air impedance plot of the woofer, please post it.
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Old 1st November 2012, 01:45 PM   #37
balerit is offline balerit  South Africa
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Sorry but not a good idea to mix 4 and 8 ohm speakers.
Mac
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Old 1st November 2012, 01:50 PM   #38
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i have the plot, i made it using excell but i'm not so sure about its correctness, because the impedance at resonance is only 13 ohm. In order to make it i used a wien bridge oscillator where i adjusted two potenziometers to vary the frequency, in the output of the amplifier i connected a resistor of 173.6 ohm, measured with multimeter, and then the woofer, i took the voltage across the woofer for every frequency going from 10hz to 100hz with steps of 5hz and from 100hz to 1kHz with steps of 100Hz, then i inverted the formula for the resistor divider to find the impedance of the woofer. The voltage was measured with a common digital multimeter set to AC measures. Did i do right? because if i did wrong also the Qts is wrong.
How can i upload the plot?
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Old 1st November 2012, 01:52 PM   #39
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plot
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File Type: jpg Diapositiva1.JPG (39.0 KB, 87 views)
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Old 1st November 2012, 02:33 PM   #40
Dissi is offline Dissi  Switzerland
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Difficult to say. 13 Ohm at 60 Hz is ok, but I'm not sure about the width. Compare your results with the simulation.

CoralCW209.jpg

Last edited by Dissi; 1st November 2012 at 02:45 PM.
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