For several months I have been working off and on rebuilding 2 Onkyo radian III speakers. I have attached a few pics of my progress. The cabinets in good condition. I have the original screens.
I removed the xover and drivers and set way aside.
the volume inside are listed by Onkyo (1971), as:
volume
+ 52762.56 cc
= 52.76256 liter
1657.5 in3
30 x 6.5 x 8.5in
= 27.161 558 58 liter.
I measure the volume as 30.75in x 9in x 7in. = 1937.25 cu. in. = 31.745 liter
The drivers I put in are 2) MW Audio MT4003 1500Hz - 20khz, FS: 1350. 4ohm.
2) Goldwood 4 ohm, GW6024
0.84 cubic foot = 23.786 liter
Nominal Diameter6-1/2"
Power Handling (RMS)90 Watts
Power Handling (max)170 Watts
Impedance4 ohms
Frequency Response29 to 4,800 Hz
Sensitivity89.5 dB 2.83V/1m
Thiele-Small Parameters
Resonant Frequency (Fs)53.7 Hz
DC Resistance (Re)3.6 ohms
Voice Coil Inductance (Le)0.4 mH
Mechanical Q (Qms)3.05
Electromagnetic Q (Qes)0.71
Total Q (Qts)0.57
I have them wired in series. A no no? Also, the crossover frequency I was aiming at was 2500hz. attached is the xover schemat.
Any help is appreciated, I think converting to 4 ohm is the way to go, wiring them in parellel, also, correcting the xover. I copied the
circuit from a commercial crossover from Midwest Speaker in St Paul. I may have done it wrong. The bass has a midbass hump, and the highs are congested and harsh, according to my ears.
Tom
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I removed the xover and drivers and set way aside.
the volume inside are listed by Onkyo (1971), as:
volume
+ 52762.56 cc
= 52.76256 liter
1657.5 in3
30 x 6.5 x 8.5in
= 27.161 558 58 liter.
I measure the volume as 30.75in x 9in x 7in. = 1937.25 cu. in. = 31.745 liter
The drivers I put in are 2) MW Audio MT4003 1500Hz - 20khz, FS: 1350. 4ohm.
2) Goldwood 4 ohm, GW6024
0.84 cubic foot = 23.786 liter
Nominal Diameter6-1/2"
Power Handling (RMS)90 Watts
Power Handling (max)170 Watts
Impedance4 ohms
Frequency Response29 to 4,800 Hz
Sensitivity89.5 dB 2.83V/1m
Thiele-Small Parameters
Resonant Frequency (Fs)53.7 Hz
DC Resistance (Re)3.6 ohms
Voice Coil Inductance (Le)0.4 mH
Mechanical Q (Qms)3.05
Electromagnetic Q (Qes)0.71
Total Q (Qts)0.57
I have them wired in series. A no no? Also, the crossover frequency I was aiming at was 2500hz. attached is the xover schemat.
Any help is appreciated, I think converting to 4 ohm is the way to go, wiring them in parellel, also, correcting the xover. I copied the
circuit from a commercial crossover from Midwest Speaker in St Paul. I may have done it wrong. The bass has a midbass hump, and the highs are congested and harsh, according to my ears.
Tom
I tried to submit pics, but got this error message:
Your submission could not be processed because a security token was missing.
If this occurred unexpectedly, please inform the administrator and describe the action you performed before you received this error.
Last edited:
I have gotten this pair sounding pretty good, except lacking in bass. The mid woofs only down to 75hz or something? I will submit technical stuff and diagrams forthwith. Also anyone ever used a crossover/schematic drawing software thjey fell in love with?
Tom
Tom
re"crossover/schematic drawing software' - google this site for 'Xsim"
'bass has a midbass hump' - usually due to a high Q driver in too small a box - try disconnecting one woofer. With judicious tuning you should be able to improve the low end
'I copied the circuit' - expect to cop some flack for that, ideally the xover is designed for the exact drivers you're using
'highs are congested and harsh' - probably crossed over too low
'wired in series. A no no?' - not a problem
'bass has a midbass hump' - usually due to a high Q driver in too small a box - try disconnecting one woofer. With judicious tuning you should be able to improve the low end
'I copied the circuit' - expect to cop some flack for that, ideally the xover is designed for the exact drivers you're using
'highs are congested and harsh' - probably crossed over too low
'wired in series. A no no?' - not a problem
a quick Unibox sim shows me that in 32L, a single driver tuned to ~40Hz works well
two drive units would need ~55L min, in 32 L the midbass hump can't be avoided in the smaller box
,,, double check your internal measurements, by my calcs the box is even smaller than 32L
two drive units would need ~55L min, in 32 L the midbass hump can't be avoided in the smaller box
,,, double check your internal measurements, by my calcs the box is even smaller than 32L
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answer...
Is there a way to measure I don't know about? I just stuck a ruler in there and measured, but had to transpose the units. I am rusty. I am working on answers for your other points, thanks for your help.
Is there a way to measure I don't know about? I just stuck a ruler in there and measured, but had to transpose the units. I am rusty. I am working on answers for your other points, thanks for your help.
I just converted your inch measurements to cm by multiplying by 2.54.
You guys should really throw off those old colonial shackles and enter the 19th C.....
Sanity check:
30.75" = 78.1 Cm
9" = 22.8 Cm
7" = 17.8 Cm
Converting to Dm (divide by 10) and multiplying gives the volume in Litres = 31.7L, so you were pretty close
(I was still half asleep when I posted the above)
add a bit of stuffing & it'll behave more like ~ 35L.
You guys should really throw off those old colonial shackles and enter the 19th C.....
Sanity check:
30.75" = 78.1 Cm
9" = 22.8 Cm
7" = 17.8 Cm
Converting to Dm (divide by 10) and multiplying gives the volume in Litres = 31.7L, so you were pretty close
(I was still half asleep when I posted the above)
add a bit of stuffing & it'll behave more like ~ 35L.
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addendumb!
Pete, thx for your replies, much to chew on. Currently I am working on drawing the xover schema, I have put in 4 JBL LE20 tweets and they sound good, no harshness. The harshness is gone, just tuning the bass is left. Can't believe how good they sound now.
My Mom is dying of Alzheimer's and that is taking alot of my time, predictably.
But I still want to measure the speaker out. I bought a mic from Parts Ex., dloaded software, etc., don't know if I need a good soundcard setup for my
laptop? Or can I just use the mic input on the laptop. I know it works, I use it currrently for line level programming.
Pete, thx for your replies, much to chew on. Currently I am working on drawing the xover schema, I have put in 4 JBL LE20 tweets and they sound good, no harshness. The harshness is gone, just tuning the bass is left. Can't believe how good they sound now.
My Mom is dying of Alzheimer's and that is taking alot of my time, predictably.
But I still want to measure the speaker out. I bought a mic from Parts Ex., dloaded software, etc., don't know if I need a good soundcard setup for my
laptop? Or can I just use the mic input on the laptop. I know it works, I use it currrently for line level programming.
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