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Multi-Way Conventional loudspeakers with crossovers

How to wire 4 ohm speaker and tweeter to a 4ohm 150w RMS amplifier?
How to wire 4 ohm speaker and tweeter to a 4ohm 150w RMS amplifier?
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Old 11th January 2019, 08:22 AM   #1
Nived is offline Nived
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Default How to wire 4 ohm speaker and tweeter to a 4ohm 150w RMS amplifier?

Hi Friends,

Iam planning to build a two way speaker system for my 150W RMS 4ohm amplifier. My driver configs are; 8inch woofer of 50W RMS @4ohms and Piezo horn tweeter of 40W RMS @4/8ohms (dnt know why it is marked as 4/8). How can i wire these two ? In series ? or if i need 4ohms nominal from these two can i use a 8ohm woofer instead of 4ohm?

does this system requires a two way crossover compulsory or can i wire it directly in parallel or series ?

Amplifier ratings : 150W RMS per channel @ 4ohms
Woofer : 4ohm, 50W RMS, 8inch
Tweeter : 4/8ohms, 40W RMS, Piezo horn tweeter 7"x3"
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Old 11th January 2019, 09:23 AM   #2
JMFahey is offline JMFahey  Argentina
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Your 150W RMS amplifier will destroy your 50W RMS woofer.
Upgrade that and we continue talking.
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Old 11th January 2019, 10:29 AM   #3
nigelwright7557 is offline nigelwright7557  United Kingdom
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The drivers will present different loads at different frequencies due to the crossover.
I would just wire them in parallel.
But I would be careful using such a powerful amp with lesser speakers.
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Old 11th January 2019, 10:43 AM   #4
TBTL is offline TBTL  Germany
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Wiring in parallel should work. If the amplifier starts oscillating, adding a series resistor to the piezo will help maintain amplifier stability. Something from 10 - 22 ohms will work. Then wire the woofer and [piezo + resistor] in parallel.
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Old 11th January 2019, 11:28 AM   #5
audfrknaveen is offline audfrknaveen  India
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so you people are saying crossover is not a compulsion !!!
Does it mean all low freq. will also go to tweeter and all high freq. also go to woofer.
Isn't there any risk of damage ???

I don't know the details, but some one used a simple capacitor as a crossover.
Any thoughts on this please .....

Last edited by audfrknaveen; 11th January 2019 at 11:58 AM.
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Old 11th January 2019, 12:19 PM   #6
picowallspeaker is offline picowallspeaker  Italy
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...as a piezo tweeter is a capacitative load, the capacitor used as HP is not useful- but it works, however. And, yes, the problematics of having a woofer and a tweeter ( and, often, a midrange driver ) working together is already solved with the network of components ( L-R-C ) called crossover
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Old 11th January 2019, 01:41 PM   #7
JMFahey is offline JMFahey  Argentina
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Yes, crossovers are needed, no doubt, but in this particular case itīs common practice not to *add* one to the one thatīs already there.

The woofer (any voice coil speaker by the way) does already have a series inductor, the voice coil inductance, which makes it steadily rise impedance above about 1kHz .

And the piezo tweeter IS a capacitor.
So much so that , as recommended above, itīs good practice to add a series resistor, anything from 10 to 50 ohm, 2W.

Its impedance within the Audio band is so high that in practice "itīs not there" and the speaker cabinet can be considered same impedance as the woofer.

My problem is not with that, but woofer power handling.

In any case, we donīt know either the speaker nor the amp involved, so ....
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Old 11th January 2019, 04:03 PM   #8
Galu is offline Galu  Scotland
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Quote:
Originally Posted by audfrknaveen View Post
so you people are saying crossover is not a compulsion !!!
Piezo tweeter crossovers are not compulsory, but are recommended for the reasons explained here:

Frugal-phile | Piezo Tweeter Crossovers | J Risch
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Old 12th January 2019, 06:50 AM   #9
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Is it ok in wiring both 4ohm woofer and 4ohm tweeter in parallel ? chance for any total impedence issues ? bcoz my amp's impedence is also 4ohms.
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Old 12th January 2019, 06:57 AM   #10
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you mean wiring 4ohm woofer + 4ohm piezo tweeter (with a resistor in series) should work. right ? my amp's impedence is also 4ohms. so is there any chance for total impedence issues ? i mean 2 4ohm drivers in parallel reduces to 2ohm right...
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