Crossover

[Kamranbits]

I have a two way bookshelf speaker with tweeter connected with woofer in parallel and woofer is connected to amp directly.
so i want to protect woofer from over powering or handling high frequency what can I do, should i use coil or inductor ect ect Suggest.

About tweeter it has inline 3.3uf 100v capasitor so nothing to worry about it.
Just the woofer protection

Tweeter 2.5 inch 4ohms 10w
Woofer 5.5 inch 6ohms 50w

Cabinet two way bass reflex type.

Thanks
🙂

 

[Scottmoose]

I'd say your first port of call should be here -you don't need to worry about the tweeter, but if you're not happy with the upper end of the bass unit's output, then it will give you a head start:
https://www.diyaudio.com/community/...igning-crossovers-without-measurement.189847/

 

[Cal Weldon]

As Scott has alluded to, is there something about the midrange you don't like? Is it too strong?
The woofer itself does not require 'protection'. This would only be to shape the sound.

 

[Kamranbits]

When I turn my volume too loud like near 90 woofer handles bass smoothly but vocals gets distorted

 

[Galu]

Which two way bookshelf speaker is this? Make and model please.

Some have a mid/bass driver the response of which is tailored to run direct from the amplifier terminals.

P.S. Consider that you may be turning the volume up beyond the capabilities of the speaker.

 

[opusadat]

Hello, https://www.omnicalculator.com/physics/crossover can be of assistance to you. and the free crossover designer XSim will also help you with the results. I used it to build my three-way crossover. additionally, you can compute the high-pass and low-pass filters. To achieve a richer sound, place a 3" speaker box next to the bookshelf speaker and create a 3-way crossover. I can give you a good schematic of a three-way crossover if you'd like.

 

[Galu]

@Kamranbits Is this thread about the Kenwood speaker about which you've posted before?

https://www.diyaudio.com/community/...eaker-directly-connected-to-amplifier.405428/

 

[Kamranbits]

Yes

 

[Galu]

Then adding an inductor in series with the woofer will not cure the vocal distortion.

If you want to experiment, connect an inductor of around 0.12 mH in series with the mid/woofer.

 

[Kamranbits]

Crossover helps direct certain frequencies to the woofer or safeguards it from damage due to excessive power or frequencies
This might cure problem of distortion

 

[Galu]

The inductor would stop the mid/woofer from reproducing high frequencies well beyond the range of the fundamental frequencies produced by the human voice (90 Hz - 1,050 Hz), so would not cure distortion in the vocal range.

Your problem would appear to be that you expect a low budget music system speaker to handle high amplifier power as effectively as a Hi-Fi speaker.

 

[Kamranbits]

Absolutely, the limitations of a budget-friendly speaker are understood. I'm trying to enhance its performance while acknowledging its constraints. Sometimes, exploring different setups is part of the fun, even if it means navigating the boundaries of what's technically achievable.

 

[Scottmoose]

Crossover helps direct certain frequencies to the woofer or safeguards it from damage due to excessive power or frequencies
This might cure problem of distortion

You will not (or are extremely unlikely to) damage a midbass driver by sending HF to it, so if you're worried about physical damage, forget about it. You can certainly damage a tweeter by putting excessive amounts of low frequencies through it though.

If the midbass goes into uncontrolled breakup at the top end of its range, some kind of low pass may (may) help, although how effective it would be will depend on the inductance rise -from the picture, I'm not expecting these to be state of the art motors, in which case some kind of Zobel may be valuable.

 

[Kamranbits]

For tweeter i have inline 3.3uf capasitor the issue is only with woofer.

 

[Scottmoose]

See the advice that has been given above: I've given you a link to a useful thread where you can do your own calculations & learn the basics, and there are also suggestions for an inductor & / or inductor + zobel for the midbass unit, plus another link to an on-line calculator. There isn't much else that can be said I'm afraid, unless you're able to measure the drivers.

 

[Galu]

Yes, we have discussed the possible issues (or non-issues) associated with the mid/woofer.

To control the potential 'break-up' mentioned by Scottmoose, place an inductor in series with the mid/woofer as I suggested earlier.

You will not be able to design a Zobel network without knowing the inductance of the mid/woofer voice coil, so that avenue will be closed to you.

I still say, "turn the volume down"!

 

[PeteMcK]

re:'tweeter i have inline 3.3uf" - insufficient, you need a higher order filter for the tweeter.
as Galu says, "turn the volume down"

 

[Galu]

Actually, Pete, Kamranbits had to substitute the original tweeters with 2.5 inch 'full range' drivers which should comfortably handle the 1st order filter.

I've been following his threads about his Kenwood speaker - it's a long story!

 

[Kamranbits]

Thanks you all for your inputs.
So as per the conversations we have three options

1.)Use a 0.12 mH coil

2.)turn down the voice

3.) Get a crossover network (attached a pic of crossover below)

 

[Galu]

I suggest you go for options 1 and 2.

As for option 3, you simply can't expect a random off-the-shelf crossover to match your drivers, so don't waste your money.