Want to create a Speaker cabinet with 2 Woofers and a tweeter

[himanshuweb2]

Hi Friends,

I am from Mumbai, I want to create a speaker which has 2 woofer's and 1 tweeter.

The specification of the Woofer and Tweeter are as follows

Woofer: Frequency range 60Hz to 10 KHz, Impedance 4?, Power Handling 40W RMS
Detailed Specification of Woofer:
IWAI :::::: unique solution for audio system ::::::


Tweeter: Frequency range: 2KHz to 20KHz, Impedance 6 ?, Power Handling 15W RMS
Detailed Specification of Tweeter:
IWAI :::::: unique solution for audio system ::::::

So total O/P from One Speaker Cabinet will be : 40Wx2 + 15 W= 85 W RMS

I want to make 2 Speaker Cabinets (Total o/p: 170W RMS)

I need to know how to connect these 2 woofers and 1 tweeter in one speaker box (heard about a cross-over, but I am totally new to these things).

Do I need to make a 2-way cross over circuit for this or a 4.7microfarrad (50V or 100V)capacitor will do the work(but how to connect this capacitor to 3 units?).


Also if anyone stays in Mumbai, please tell me a shop which sells cabinet (economical ones) and can also make the 2-way cross over (or connect my speakers into the box).


I went to lamington road , but almost all the shops want to use their own speakers in their cabinets.

One Addition: Why I choose IWAI speakers over other: They are economical (they are cheaper than other branded speakers, my budget is also less) and on listening to them they are better than local speakers(Queena, Sonnex, etc)

Thanks in Advance

(Sorry for a large post)

 

[navin advani]

Woofer: Frequency range 60Hz to 10 KHz, Impedance 4?,
Tweeter: Frequency range: 2KHz to 20KHz, Impedance 6 ?,

So total O/P from One Speaker Cabinet will be : 40Wx2 + 15 W= 85 W RMS

Also if anyone stays in Mumbai, please tell me a shop which sells cabinet (economical ones) and can also make the 2-way cross over (or connect my speakers into the box).

1. Given the woofer and tweeter you have chosen the only "safe" option is to use the 2 woofers in series which means you can't do a 2.5 way.

2. Given the Fs of the tweeter you would need to crossover at at least 2500Hz/12db.

3. Given the Qts of the woofer a sealed box would be your best option.

4. Read this link
Introduction to designing crossovers without measurement - diyAudio

 

[himanshuweb2]

Hi Navin,

Thank you very much for your reply.


I went through the link and was able to understand few topics (but I got confused with the terms FLATTENING THE WOOFER'S IMPEDANCE and

FLATTENING THE TWEETERS IMPEDANCE).


Assume I have two woofers A and B.

For connecting 2 woofers in series I will first connect +ve terminal of woofer A to +ve terminal of crossover circuit (which is not built yet),

then I will connect negative terminal of woofer A to +ve terminal of Woofer B.
then I will connect negative terminal of woofer B to -ve terminal of crossover circuit.

I will connect +ve and -ve terminals of the Tweeter to the respective +ve and -ve terminals of the cross over circuit.



Will search more for "Flatten the impedances" and making a "cross over circuit" on google.

For my set of drivers (2 woofer and 1 tweeter) is there a readymade crossover circuit available in Mumbai (if yes could you tell me the shop location and address)?



Thanks for Your Help

Regards,
Himanshu

 

[jaudere]

For readymade crossovers,

ahujaradios.com
partsexpress.com

Do you have engineering/eletcronics background or experience in soldering?

What would be good to build is MTM design (mid-tweet-mid).Read more about it

Capacitors are easy to get but not the coils(Inductors). For low pass filter part of the XO you will need coils.

For cabinets, visit diyaudio.com.

It would be better to build your own cabinet to th specifications (TS parameters) of your own speakers.rather than using a readymade.

By the way, from where did you buy those speakers? I had heard that IWAI sells only in big bulks.

 

[navin advani]

FLATTENING THE WOOFER'S IMPEDANCE and
FLATTENING THE TWEETERS IMPEDANCE).

For my set of drivers (2 woofer and 1 tweeter) is there a readymade crossover circuit available in Mumbai (if yes could you tell me the shop location and address)?

1. These are simple RC networks used to ensuare that the power curve of the driver stays the same.

2. I would not advise the use of some textbook crossover. FOr good sound you need to ensure the crossover is degined to work with the drivers concerned.

 

[Kannan_madhu]

All the best for your project , i am also trying to build my first proper DIY speakers . i am really confused on the many aspect of designing the enclosure and crossovers. Hope some of our great DIY speaker Gurus will start a noobs speaker cookbook thread . and how much are those iwai drivers cost ?

 

[sandeep2082in]

Hi Friends,

I am from Mumbai, I want to create a speaker which has 2 woofer's and 1 tweeter.

The specification of the Woofer and Tweeter are as follows

Woofer: Frequency range 60Hz to 10 KHz, Impedance 4?, Power Handling 40W RMS
Detailed Specification of Woofer:
IWAI :::::: unique solution for audio system ::::::


Tweeter: Frequency range: 2KHz to 20KHz, Impedance 6 ?, Power Handling 15W RMS
Detailed Specification of Tweeter:
IWAI :::::: unique solution for audio system ::::::

So total O/P from One Speaker Cabinet will be : 40Wx2 + 15 W= 85 W RMS

I want to make 2 Speaker Cabinets (Total o/p: 170W RMS)

I need to know how to connect these 2 woofers and 1 tweeter in one speaker box (heard about a cross-over, but I am totally new to these things).

Do I need to make a 2-way cross over circuit for this or a 4.7microfarrad (50V or 100V)capacitor will do the work(but how to connect this capacitor to 3 units?).


Also if anyone stays in Mumbai, please tell me a shop which sells cabinet (economical ones) and can also make the 2-way cross over (or connect my speakers into the box).


I went to lamington road , but almost all the shops want to use their own speakers in their cabinets.

One Addition: Why I choose IWAI speakers over other: They are economical (they are cheaper than other branded speakers, my budget is also less) and on listening to them they are better than local speakers(Queena, Sonnex, etc)

Thanks in Advance

(Sorry for a large post)

Use a 2nd order crossover for better results with 5.6uf caps and 0.72mH inductor coils.. Or check out SMD AUDIO u'll get what you want in there.

 

[himanshuweb2]

Hi All,

Thank you Navin, Jaudere, Kannan_madhu and sandeep2082in.

From the above reply I have made a rough 2nd order cross-over circuit (using help from DIY Audio & Video - FAQs, Tutorials, and Calculators for Speaker Boxes, Crossovers, Filters, Wiring and more)

Tweeter Impedance: 6 Ohms
Woofer Impedance: 8 Ohms (4 ohms + 4 ohms in series)
Frequency: 2500Hz (I think this is the cross-over frequency, I am using this value as provided by Navin, please correct me if I am wrong)

Crossover Type: 2nd Order Butterworth (I am using this for the first time)


After this I got a Circuit diagram which is as attached:
I will require following components:

Parts List

Capacitors
C1 = 7.5 uF
C2 = 5.63 uF

Inductors
L1 = 0.54 mH
L2 = 0.72 mH

(The Issue is where will I get Inductors of 0.54 and 0.72 miliHenries, need to go to Lamington road, Mumbai to buy Inductors and Capacitors, any suggestions about shops?)

Please correct my circuit, so that once the circuit is finalized, I will buy the final components.

@Jaudere : I am from Computer Engg. background, so have basic knowledge about circuits (studied these thing during my first year, long
back...), I have a little experience in Soldering, using the solder gun and wire. IWAI agreed to sell me the speakers (in retail quantity), I
bought the speakers directly from there Mumbai (Vasai) factory(the sound is very nice).

@ Naveen: I will dig into this (FLATTENING THE WOOFER'S IMPEDANCE and
FLATTENING THE TWEETERS IMPEDANCE) and will try to implement it in my circuit.


@Kannan_madhu : Thanks for your wishes, this is the first time I am trying to build my Own speakers (let's hope every thing works fine)
Cost of my Drivers:
Woofer (40W RMS): Rs. 685 each(inclusive of all taxes)
Tweeter (15W RMS): Rs. 465 each(inclusive of all taxes)


@sandeep2082in: I have used your advice to create a 2nd order crossover, I have also contacted "http://www.smdaudio.in/"
for a quote for my Crossover circuit, If they offer me an affordable quote, I will go with them (as they are experienced, and it will save a lot of time)

Thanks again for your help.

 

[himanshuweb2]

One question for above circuit diagram, can above circuit handle the wattage of my speakers (woofer 40w each), tweeter (15w) , total wattage 95W rms. Also suggest any improvements in the circuit(I would like to make it least complex and more reliable ).

what will be the voltage rating for the above capacitors (50V or 100V) ?

@sandeep2082in: I contacted "http://www.smdaudio.in/" today, they do not sell only Crossover circuits, so I will need to build the crossover on my own.

Regards,
Himanshu

 

[jaudere]

I AM building a speaker as well but it will open baffle with only single high pass filter involved and may be a low pass filter. I was reading about cross overs recently. Got this formula on net.

Multiply power of amp per channel into impedance (e.g. 60w X 4ohm. This is for my Marantz pm6002). Find out the square root.( about 16 in above example). Multiply this by 3. So it is 48 in my case . This is the minimum voltage of capacitor. So i looked for capacitor above 50v. Actually I bought an MPP Capacitor of 440V,works on AC(usually used in fans). You have to choose nonpolar caps(today itself I read that the polar caps are supposed to be used in DC Applications). Polys are supposed to be better than electrolytic especially for tweeters.

You are lucky to be knowing bit of soldering. I am a doctor. So i am paralysed once woodwork or soldering comes in.

 

[Kannan_madhu]

Himansu , is there any particular reason you chose these particular woofer and tweeter , i like to know how to select matching drivers .

 

[himanshuweb2]

Hi Kannan_madhu,

There is no particular reason that I choose those speakers. I wanted to have a single speaker cabinet near to 100W rms (according to my current config total o/p is 95W rms per cabinet) and one of my friend told me that IWAI manufactures premium quality speakers at a affordable price (in my budget I can't go for POLK or other premium speakers, so I decided to go for IWAI speakers.)

Which speakers are you going to buy for your DIY Speakers.

Regards,
Himanshu

 

[Kannan_madhu]

i was planing to buy peerless M13NH woofer , and T25an teeter from Mr Khanna , he is offering a kit in MTM config .but IWAI seems to be good do they ship in small quantities ?

Ps those iwai woofers look similar and has the same dimensions as those comes in PSB alpha
you can try a tower like this

even iwai has a tweeter looking similar to the one used in alpha

 

[navin advani]

Hope some of our great DIY speaker Gurus will start a noobs speaker cookbook thread

Tweeter Impedance: 6 Ohms
Woofer Impedance: 8 Ohms (4 ohms + 4 ohms in series)
Frequency: 2500Hz (I think this is the cross-over frequency, I am using this value as provided by Navin, please correct me if I am wrong)

Crossover Type: 2nd Order Butterworth (I am using this for the first time)
Inductors
L1 = 0.54 mH
L2 = 0.72 mH

@sandeep2082in: I have used your advice to create a 2nd order crossover, I have also contacted "http://www.smdaudio.in/"

Great I see you are working in the right direction but...

1. I'd look at a L-R XO instead of Butterworth.
2. L1 will not compensate for baffle step. I would add a L/R network to compensate for baffle step.
3. You might need a L-pad on the tweeter.

 

[himanshuweb2]

@jaudere: Thanks for the formula for calculating the voltage for the Capacitor and also regarding choosing the type of capacitor.


@Kannan_madhu: The peerless drivers you have shown are really nice, I don't know if IWAI ships there speakers for retail customer, you can
contact them over phone and check."http://www.iwaispeakers.com/contact.php"
If you are getting a Kit to build your speakers that will be really great (or you will have to make a cross over,design a speaker enclosure, etc.) I will also use the design given by you for making my DIY Speakers, thanks


@Navin: Thanks a lot for reviewing my circuit diagram.

Does "L-R XO" stands for "Linkwitz-Riley Cross Over"?

I am attaching the latest Circuit diagram of "2nd Order Linkwitz-Riley" crossover, could you please show me the correction it needs?
I don't know what is "baffle step" (need to google it to know the exact meaning),
where should I add a L/R network to compensate for baffle step and also L-pad on the tweeter?

Thanks again.



@H20: Thanks for your reply, I will be using 50V capacitor (and PP caps for HF driver). Thanks

 

[navin advani]

1. The impedance compensation goes between the XO and the driver. It is usually a simple RC circuit in parallel with the driver.

2. the baffle step goes between the amp and the woofer's series inductor. it is usually an inductor and a resistor in parallel. The resistor is usually the Re of your woofers (in your case both woofers in series).

3. The L pad of the tweeter sit between the tweeter and all other networks. SO if you are looking right to left from the tweeter to the amp... you will first see the L pad, then the RC network for impedance compensation and then the XO itself.

 

[himanshuweb2]

Hi Navin,

Thank you for your reply. I will look into the baffle step (point 2.), the L pad for tweeter.
Thanks for explaining point 3 in detail.

I will update here once I have redrawn my circuit diagram.

Thanks and Regards,
Himanshu

 

[himanshuweb2]

Hi Friends,


Currently there is no success with the Circuit for Cross Over , have contacted a local carpenter for Speaker Enclosures, Will update you once I finalize my Circuit for 2-Way Cross Over.

Thank You each one of you for your help

Thanks and Regards,
Himanshu

 

[himanshuweb2]

Hi Friends,

My sincere apologies for so late reply. I was really busy with few other things in life.

Today I got the speaker boxes made and the installation of the woofer and tweeters. I have used a local circuit for Tweeter (which acts as a High Pass filter). Sorry again I couldn't go for a 2-way crossover.

But the overall o/p is really AMAZING!!!!!!

It's very nice for Music and also for watching movies on TV.

My sincere thanks to IWAI Speakers, Hifivision.com and all the users who helped me throughout this post.

PFA the photos of the speakers. Do reply your feedback

Thanks and Regards,
Himanshu

 

[vaibhav.gadade]

congrats himanshu, and welcome to the world of audio DIY.

the drivers you selected are good. as i was looking at data sheet, the woofer has higher sensitivity than the tweeter which is rare. in such a case i would have suggested you a 2 way configuration. i am thinking that with the added woofer, the treble may not be up there and your speakers may be bass heavy or may sound a little muddled. do tell us more about the sound.

lemme see if i can model a theoretical crossover for you meanwhile if you would like to tweak around a little bit more.