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Hello, help needed for speaker wiring.
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Schumann View Drop Down
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    Posted: 10 September 2017 at 11:22am
Hello folks and expert buddies,

I am building a stereo speaker system for home. I guess I am a newbee, so posting it here.

I bought the material already, and then later I realised I have to match them correctly.
Here is what I have- 
1) 210 x 210 watts amplifier. 4 to 8 ohms range.
2) A pair of 300 watts crossover. 4 to 8 ohms flexible. 
3) Pair of 4 inch full range speakers, 8 ohms, 15 watts.
4) Pair of 4 inch woofers, 8 ohms, 40 watts.
5) Pair of dome tweeters, 8 ohms, 15 watts.
6) Pair of ribbon tweeters, 8 ohms, 15 watts. 

So including tweeters, I will be hooking 4 speakers on each channel.

I tried single 15 watts full range speaker to the amp, and it goes crazy after 10% volume. If I attach it in serries with the woofer it works better, but still I have to keep below 50% volume. 

I want to attach all these,  two tweeters, 1 woofer and one full range drivers on each side without getting distorted even at full volume(without loosing sound quality) .
May be I need to attach some capacitor in serries? Or....
Please give me some ideas. 

Thank you, see you Smile
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doller View Drop Down
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Is your amp 210 at 4r or 8r? I don't think there is a range. It is or it isn't. Is it a HI FI amp or PA amp? Your speaker will add up to 85w. Is that peak? Or continuous? Or program?
Lots more info needed I would guess.
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Schumann View Drop Down
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Originally posted by doller doller wrote:

Is your amp 210 at 4r or 8r? I don't think there is a range. It is or it isn't. Is it a HI FI amp or PA amp? Your speaker will add up to 85w. Is that peak? Or continuous? Or program?
Lots more info needed I would guess.

Hello,
 My amplifier is TDA8954, class D amplifier, 210 + 210 watts , RL 8ohms.
Output resistance is written - 4ohms to 8 ohms. 
It has Ac and Dc both inputs. I am running it on 24-0-24 ac transformer. 
The speakers show rated power, rms power. 
I will post the images of the speaker information when I figure out hout to upload images soon.
Or is it allowed to post product links here?

Thank you for reply, see you.
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Conanski View Drop Down
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Why did you buy 2 sets of tweeters and 2 sets of 4" drivers? Is the crossover 2 way or 3 way?
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Schumann View Drop Down
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Originally posted by Conanski Conanski wrote:

Why did you buy 2 sets of tweeters and 2 sets of 4" drivers? Is the crossover 2 way or 3 way?

Hallo Conanski, thank you for reply,
The crossover is 2 way. 
I saw somewhere there was this ribbon tweeter and silk dome tweeter as a single unit. I did not find that anywhere, so I bought two of those types separately. The ribbon for very high frequency, and the silk dome for regular tweeting. A full range driver, and a woofer. I planned to use the full range driver directly in parallel with the crossover. 
4 drivers on each side, because I thought my amplifier is total 420rms. So I need more of them to match. 
I chose 4 inches driver because I wanted to build a slim unit. No space for 8inches or 10 inches driver boxes.

Here are the links-
http://s.aliexpress.com/J3u6FjUb
http://s.aliexpress.com/Eje6n6f2
http://s.aliexpress.com/6VniMvYn
http://s.aliexpress.com/jYBbuyM3
The technical data is in the description of each driver page.

Originally posted by doller doller wrote:

Is your amp ........ 
please take a look at these brother.
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Conanski View Drop Down
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Points: 2543 		Post Options Post Options   Thanks (1) Thanks(1)   Quote Conanski Quote  Post ReplyReply Direct Link To This Post Posted: 12 September 2017 at 3:14am
Originally posted by Schumann Schumann wrote:

The crossover is 2 way. 
I saw somewhere there was this ribbon tweeter and silk dome tweeter as a single unit. I did not find that anywhere, so I bought two of those types separately. The ribbon for very high frequency, and the silk dome for regular tweeting.
That's isn't going to work. You didn't supply a link for the crossover but you would need a 3 way to split them at different frequencies.

Originally posted by Schumann Schumann wrote:

A full range driver, and a woofer. I planned to use the full range driver directly in parallel with the crossover. 4 drivers on each side, because I thought my amplifier is total 420rms. So I need more of them to match.
These are horrible ideas for multiple reasons, I strongly encourage you to dismiss all this and just build a standard 2 way with a pair (1 woofer and 1 tweeter) each.


Edited by Conanski - 12 September 2017 at 3:17am
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doller View Drop Down
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I agree with Conanski. I was thinking kinda the same thing. Just start with a simple 2 way enclosure. What you are trying to do ie 4 way is really really hard to get rite.
I think that you should also read up on amp power vs speaker power. If you put 210w into a 15w speaker I would guess that you might need to put up with a bit of distortion at full volume. Maybe a smokey smell too.
Good luck with your project.
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Schumann View Drop Down
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Originally posted by doller doller wrote:

I agree with Conanski. I was thinking kinda the same thing. Just start with a simple 2 way enclosure. What you are trying to do ie 4 way is really really hard to get rite.
I think that you should also read up on amp power vs speaker power. If you put 210w into a 15w speaker I would guess that you might need to put up with a bit of distortion at full volume. Maybe a smokey smell too.
Good luck with your project.

Hi Conanski and dolar,
Sorry forgot to post the crossover link. Here http://s.aliexpress.com/3Q3qiMBZ

Ok, I should take your advice and build the two way. Will show pictures when finished.
Thank you very much :) :)
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doller View Drop Down
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Points: 509 		Post Options Post Options   Thanks (1) Thanks(1)   Quote doller Quote  Post ReplyReply Direct Link To This Post Posted: 13 September 2017 at 9:34am
Sorry if I was a bit rude but couldn't help it. That said if you build a 2 way box and get it rite you will learn alot . (maybe you know alot already I don't know) Find out what slopes your cross overs are how many db and what type. Bessel, Butterworth, etc. Valuble info. Distortion is something that I think you will get with a 4 inch unit. I have used them in the past for cafe installs. They won't go loud. 89bd. I personaly think that an 8 inch is the minimum for any kind of bass. But just my opinion others will say different. The best 4 inch I have used was a Scan Speak.
Just read the link It's 12 db. But I am confused about the 4r and 8r.
Looks like translated Chinese.
How can this be 3000hz 4r and 8r ? Anyone? Shouldn't it should drop to about 1700hz at 4r. Rough guess.
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Schumann View Drop Down
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Originally posted by doller doller wrote:

Sorry if I was a bit rude but couldn't help it. How can this be 3000hz 4r and 8r ? Anyone? Shouldn't it should drop to about 1700hz at 4r. Rough guess.

Hello, not rude to me, because I understood that you are a senior experienced builder. Smile
I only have soldering skills, designing skills, and everything in art and a few things out of intuitions like Leonardo da vinci, which turns perfect so far. Dont know much about the electronic values.

I actually chose that crossover because it was the only one close to 210watts, other crossovers were of much less watts. Yes that seems to be translated from Chinese language, which I presumed as 4ohms and 8ohms flexible. 
I was looking for natural bass, not much exagerated, so I chose the passive crossover. Only concern was to protect the tweeters from low frequency. 
I could have just added a capacitor to do that, but I felt to add something stronger which will not get heated. 
As you said, may be I will try the 8 inch or bigger driver in my next project. 

I found out that when I add a tone controlled preamplifier, I can control the input towards the 210+210 power amplifier. Embarrassed
Will try more experimenting,  with 2 way.  

Thanks again, see you 


Edited by Schumann - 13 September 2017 at 7:03pm
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