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Multi-Way Conventional loudspeakers with crossovers

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Old 1st June 2006, 01:12 PM   #1
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Default new loudspeaker

Hi all,

I have new drivers and I wanted to run them up a little to just see whether there were any problems. I've tested for dc resistance but I also connected them to the output of acheap 3 way crossover bought from an electronics shop. They're just sitting on their magnets on the floor - no wood yet because I'm still fixing the saw.

I put a little cd music through them actually (Chris Rea - Road to Hell if you must know !!). The woofers in particular sounded absolutely crap !

Is this normal ? (Yes, they were connected to the woofer filter and yes all 8 of them sounded the same)

It seemed to distort badly and there was absolutely no bass.

When I connect a sig gen to the amp the single frequencies don't seem to be bad...

I really hope they will sound very different in a box !!

Cheers,
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Old 1st June 2006, 02:46 PM   #2
Tenson is offline Tenson  United Kingdom
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did you connect all 8 at the same time? o.O Make sure you connect them so they give a nice load.

Otherwise yes, you will get no bass. With no baffle, the bass from the back will cancel out the bass at the front as it is out of phase. They also are not run in right? Give them 3 days solid of use then listen again. You can place them face to face and wired out of phase to help reduce the annoyance. Run them through the crossover too so the high-frequencies don't annoy.
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Old 1st June 2006, 04:46 PM   #3
sreten is offline sreten  United Kingdom
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Default Re: new loudspeaker

Quote:
Originally posted by steve_mak


The woofers in particular sounded absolutely crap !

Is this normal ?

Cheers,

Yes, /sreten.
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Old 4th June 2006, 12:28 AM   #4
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Hi guys,

Thanks for the thoughts. I was running them one at a time and was basically trying to see whether I had any duds to send back to the distributor.

I tried to give them some music rather than sine waves to break them in because I thought they would sound terrible if there was a problem - but they sound terrible anyway !!

I think I may be best served at this stage just running them through their respective frequency ranges checking for scraping voice coils and such.

Even so, I really hope they sound better in their boxes - especially the woofers !

Cheers,
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Old 4th June 2006, 12:53 AM   #5
Tenson is offline Tenson  United Kingdom
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What woofers are they? If they are cheap they will sound crap, surprisingly!
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Old 4th June 2006, 12:56 AM   #6
tinitus is offline tinitus  Europe
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well, most music sound od without bass - as I understand you connect only woofers to 3way crossover - that might not be so good on your amp - try the woofers without crossover
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Old 4th June 2006, 03:46 AM   #7
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Hi Tenson,

They are Seas 8 inchers the CA22RNX. I'm powering them up now. Apart from a funny sound down low (say 40 Hz through 100 Hz - a sort of wooshy sound) when I really get some Xmax happening, they are fine. I reckon if all 8 sound the same and do the same things then that's what is meant to happen. I'm new to the game as you can see.

Hi tinitus,

The crossover is a 3 way - a cheapie - on an old integrated amp.

Cheers guys !
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Old 4th June 2006, 03:52 AM   #8
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Hey !

I have been sitting the woofers horizontally on a piece of foam but when I lifted them up the noises changed. I've discovered that there is a fair wind (literally) coming out of the back of the speaker from a hole in the centre of the magnet. The wooshy sound is air rushing through the hole - at least this anyway.

Rgds,
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Old 4th June 2006, 04:53 AM   #9
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Default Re: new loudspeaker

Yes of course the bass is missing without an enclosure and yes they will certainly sound better once you make a full speaker system instead of just resting them out in the open.

You could just mount one in a hole the middle of a sheet of cardboard or cardboard box and listen again and you'll get at least a little bass that way.

Don't worry about the whooshing sound coming out of the vent on the back. That will also be reduced once the driver is mounted in an enclosure. Not only will it be reduced, but it will also be harder to hear that reduced whoosh as it will then be occuring inside a box.

Quote:
Originally posted by steve_mak
Hi all,

I have new drivers and I wanted to run them up a little to just see whether there were any problems. I've tested for dc resistance but I also connected them to the output of acheap 3 way crossover bought from an electronics shop. They're just sitting on their magnets on the floor - no wood yet because I'm still fixing the saw.

I put a little cd music through them actually (Chris Rea - Road to Hell if you must know !!). The woofers in particular sounded absolutely crap !

Is this normal ? (Yes, they were connected to the woofer filter and yes all 8 of them sounded the same)

It seemed to distort badly and there was absolutely no bass.

When I connect a sig gen to the amp the single frequencies don't seem to be bad...

I really hope they will sound very different in a box !!

Cheers,
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Old 4th June 2006, 06:03 AM   #10
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Steve Mak,

You are such a n00b, and for that we forgive you. :-)

Dude, you've got the speakers without boxes, sitting on the floor.
Before you complain about the woofers or send them back to the distributor, since when have you ever listened to speakers like that? Think about it.


a) Those speaker drivers have a vented magnet (that "hole in the back of the magnet"), which is a design FEATURE!
Any obstruction to the airflow in that vent will result in distortion flying sky high.

b) The sound wave coming off the back of cone is reflecting off the ground and interfering with the front wave, causing all kinds of unpredictable interference.




It sounds like you're going to be making up your speakers as you go along, and yeah it's gonna sound better than what you're getting now...

BUT I'm sorry to have to say this (no-one else has- too darn polite on this forum), but I hope you're building a speaker from some well thought-out design? Otherwise you're wasting a whole lot of money on some fine drivers.

In the mean time stop cranking them without boxes, you're going to burn the voice cool if you're not careful. I have no idea how much power you're sending them, and whilst "getting some xmax happening" is fun, hitting the excursion limits (any clicking noises?) is NOT a good thing.
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