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Multi-Way Conventional loudspeakers with crossovers

Mid and high range speakers
Mid and high range speakers
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Old 20th January 2018, 09:48 PM   #1
gagashagy is offline gagashagy
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Default Mid and high range speakers

Hello everyone,

Recently I have gotten myself a Pioneer sx-209 rds and have no speakers to connect to it. I am diy person on things on whatever I can find how-to's for, -speakers being one of them. I am planning to build a bookshelf speakers and at the moment, I have pair of salvaged low frequency loudspeakers from Panasonic system that was broken. (I know this is not the best start but I recall those sounding really nice) - Now here is the first problem, there is no power rating on them. By the looks and total speaker power, I can assume, they are at least 50 W.
I would like to buy a high - mid range speakers to pair up with those but am clueless what to look for. So I have few questions for you guys, that maybe have been already asked, but I did not find any (to be honest, I did not look, since I really don't know what to look for)
1. Should I buy one speaker (pair) for the high and mid range, or separate tweeters and mid-range speakers? I assume one that is good for everything, isn't really good for anything? or is this not the case?
2. I know from diagrams, that I can wire two 8 ohm speakers to have 4 ohms as total impedance and other way around. But maybe someone could suggest, how to implement high-pass and low-pass filters in this schematic? would it affect the total impedance?
3. Lets assume I am right and that speaker I already have is 50 watts. If I would to buy a 20 watt 8 ohm mid-range speaker and put it in parallel, total wattage would be 70 W? What would theoretically happen if my amp, (Rated at 40 watts per channel into 8 ohm) would to deliver those 40 watts? (a bit higher, since speakers are in parallel - 4 ohms now) The bigger speaker would be fine, but I'm curious about the 20 watt one. - Would the power output from amp damage the speaker, or the watts of all the speakers add up and it would be fine?

I know these most likely are ridiculous questions to some, but would help me a lot if someone could help.

Best of luck,
Kristaps
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Old 21st January 2018, 02:13 AM   #2
adason is offline adason  United States
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Have you used search function?
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Old 21st January 2018, 07:10 AM   #3
Tweet is offline Tweet  Australia
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Gagashagy, It might be better to invest in a kit from a local supplier. There is no indication as to where you are. You are more likely to get better results than just randomly sticking things together with the little knowledge you may have at the moment.

So for instance ............
Madisound Speaker Components

C.M
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Old 21st January 2018, 07:16 AM   #4
fatmarley is offline fatmarley  England
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Read this - LINK
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Old 21st January 2018, 09:31 AM   #5
AllenB is offline AllenB  Australia
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I wouldn't stress about power ratings. You'll hear when you are pushing them too hard, and you said you'd heard them so it sounds like you should go ahead.
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Old 21st January 2018, 02:57 PM   #6
gagashagy is offline gagashagy
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Quote:
Originally Posted by fatmarley View Post
Read this - LINK
Hi, Thank you very much for this link. Now I have somewhat idea where to start. Immediately I realized, that I don't have datasheet for my driver. From stereo that it came out of, I know the code for the driver, but I failed to locate any manufacturer data sheets or specifications, so maybe someone know where to look?
Stereo was Panasonic sa-ak44 and code written on driver is t17pl07c6.

If however I would not find datasheet, I could make these in 2.1 system and designate these drivers as separate woofer. Then as I understand, I would need separate amp to drive the sub, but cannot I use the other terminals for speakers? On my amp, I have this set of connections (attached). Or piggy back?

Regards
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Old 21st January 2018, 10:12 PM   #7
PeteMcK is offline PeteMcK
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Re:'t17pl07c6" - I may have the parameters for this; I'll have a look when I get home tonight
__________________
Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency
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Old 22nd January 2018, 02:13 AM   #8
AllenB is offline AllenB  Australia
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When you connect speakers to those output terminals they are running off the same amp. It is the same as connecting them directly together except that you can typically switch them in and out. You would need to concern yourself with the amp powering them in parallel except that crossing them normally avoids them actually being in parallel over the same range, but this is the bass region and funny things can happen when you need to account for rooms. You would need to use a passive crossover as they will both see full range output Voltage. You will need to deal passively with their differences in level.
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Old 22nd January 2018, 10:42 AM   #9
gagashagy is offline gagashagy
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Quote:
Originally Posted by PeteMcK View Post
Re:'t17pl07c6" - I may have the parameters for this; I'll have a look when I get home tonight
Thank you but I think this won't be needed, if I can trust Panasonic saying, that second amp (there were two sets of cables coming from each speaker and the sub I am referring to, had it's own) outputs frequency range from 70 - 120 Hz. So this narrow frequency range means, that for two way crossover, I would need something that covers 120 Hz up to 20kHz? Would this make sense to do, or no?
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Old 22nd January 2018, 10:54 AM   #10
gagashagy is offline gagashagy
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Quote:
Originally Posted by AllenB View Post
When you connect speakers to those output terminals they are running off the same amp. It is the same as connecting them directly together except that you can typically switch them in and out. You would need to concern yourself with the amp powering them in parallel except that crossing them normally avoids them actually being in parallel over the same range, but this is the bass region and funny things can happen when you need to account for rooms. You would need to use a passive crossover as they will both see full range output Voltage. You will need to deal passively with their differences in level.
So if understand you correct, then makes no sense to do what I had in mind. Thank you.
I think I owe an explanation to all of you, - I love somewhat good quality audio and with finances that I have, I use whatever I have to make best of it. In this case, two perfectly fine drivers (imo - fine, but I could be very wrong). So even though, I am not entirely familiar with audio electronics, I have some basic knowledge about electronics in general, thus - am willing to try making these speakers myself.
If my current ignorance annoys anyone, I sincerely apologize and kindly ask you to ignore this topic. So I am grateful to everyone who points me to right direction.

Regards
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