OK just checked and I'm wrong about needing a cross over. Piezo tweeters
don't need a cross over, however you might need to wire a resister in series
to limit the upper frequencies. (unless it already has one).
I'm now not sure about the matching by sensitivity, however a typical figure
for a piezo is about 93dB/W/M and regular car speakers 87 dB/W/M. (which
means the piezo would be 6 dB louder at one meter with one watt of amplifier
power). However whether that makes much difference or not I don't know!
I'm getting all confused by logs now.. (speaker 'volume' is sensitivity + 10
LOG(RMS wattage))
Matthew
> -----Original Message-----
> From: [email protected]
> [mailto:[EMAIL PROTECTED] On Behalf Of Matthew Wastell
> Sent: 26 November 2008 06:48
> To: [email protected]
> Subject: [Quantum Owners] Re: Hard top + Speakers
>
> Piezo horn tweeters will need only tiny power, you probably
> need a cross over before them as well. I'm not sure tho as
> i'd never use that type in anything but a PA system for
> maximum volume. I think you are looking around 1-5 watts rms
> to match 200-400 watts rms to mid and bass in that setup.
> I'll check when i'm in the UK.
>
> What's the sensitivity of the respective units? From that I
> can tell you required power and distances to try to match them.
>
> Matthew
>
>
>
>
>
> -----Original Message-----
> From: Arn1905 <[EMAIL PROTECTED]>
> Sent: 24 November 2008 23:13
> To: Quantum Owners Group <[email protected]>
> Subject: [Quantum Owners] Re: Hard top + Speakers
>
> Yes thats about where they are, they will be staying there
> untill i either make some new door cards(with some kind of
> fibreglass speaker build), or make my own dash, there wasnt
> really anywhere else to put them in the 2+2.
> when i do make the dash ill be relocating the tweeters into
> some gague pods or just sitting them flush in the dash,
> unsure about this at the moment.
>
> Yes the piezo type, ill be trying the out just to see what
> they are like, im gonna try and make it so they only really
> deal with the voice, instead of any bass or anything. If they
> turn out as you said they sound ill just end up using them as
> a horn or something.
>
> Yes ive got two amps, one for just the sub and the other for
> the 6X9's, i may connect the tweeters to these or the head
> unit, unsure of how this would effect the whole set up
> though. The co-axial speakers are connected straight to the head unit.
>
>
> Sorry, ive got no idea why i put bass tweeters there.
>
>
>
> >
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