Speaker at C4

Need datasheet.

Joe Gwinn

embedded in equipment to produce simple beep sounds. One device from CUI h as this rating on it.

, 1.2K Hz

haps. Are they saying it will produce 93 dB of sound when driven with 1 wat t perhaps? But then they mention 0.1 w. Is 0.1 watt the power input to ge t 93 dB of sound at 5 cm?

d Fo at the low end which seems to be the resonant frequency rather than a

-3 dB point.

le C ~250 Hz) along with a few harmonics with a reasonably easy method of m ounting and not eat up too much space.

e embedded in equipment to produce simple beep sounds. One device from CUI has this rating on it.

erhaps. Are they saying it will produce 93 dB of sound when driven with 1 w att perhaps? But then they mention 0.1 w. Is 0.1 watt the power input to get 93 dB of sound at 5 cm?

and Fo at the low end which seems to be the resonant frequency rather than a -3 dB point.

ddle C ~250 Hz) along with a few harmonics with a reasonably easy method of mounting and not eat up too much space.

If you pull this part up on DigiKey, three lines of the detailed specs are:

Efficiency - dBA 93.00 Efficiency - Testing 100mW/500mm Efficiency - Type Sound Pressure Level (SPL)

That suggests testing was performed at 100 mW drive with the microphone 50 cm away. Measured SPL was 93 dB, A-weighted (103 dB/watt). Seems about righ t.

-Mark

mbedded in equipment to produce simple beep sounds. One device from CUI ha s this rating on it.

aps.

I'm thinking the dB/w rating is for overall efficiency, but actual testing is done at low power, specfied distance and test frequencies, rather than a t a nominal 1W drive (which might cause harmonic distortion). Your ears don't really want 93 dBspl input.

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The data sheet says the test was done with 100mW input (890mV rms @ 8 ohms) at 5cm from the cone. 1W would be too much power for the tiny thing.

The *calculated* result was 93dB SPL (not A weighted) averaged over 4 frequencies for a distance of 1 metre. Close micing the cone eliminates room effects and works OK for a point source.

So the rated continuous output is 97dB SPL - with 250mW input. Pulse the drive signal with a 1:4 duty cycle and you can use 1W.

..... Phil

Good point, don't blindly trust numbers assigned to DigiKey's fixed categories.

Practical question: 1:4 duty cycle @ 1W is fine from a heat standpoint. Could this little speaker be expected to work without bottoming out? That's twice their "buzz, rattle, etc" voltage rating.

-Mark

e embedded in equipment to produce simple beep sounds. One device from CUI has this rating on it.

erhaps. Are they saying it will produce 93 dB of sound when driven with 1 w att perhaps? But then they mention 0.1 w. Is 0.1 watt the power input to get 93 dB of sound at 5 cm?

and Fo at the low end which seems to be the resonant frequency rather than a -3 dB point.

ddle C ~250 Hz) along with a few harmonics with a reasonably easy method of mounting and not eat up too much space.

Can anyone explain why the frequency response graph has two Y axis scales, both in dB but with a 2:1 ratio, but claiming the zero reference point is 6

These things seem to be evaluated under very different conditions. Some SP L numbers are for 500 mm, others 100 mm and others for 10 mm. One device i s rated using an IEC 318 coupler which the speaker clamps into. This is al l from just one manufacturer!

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, both in dB but with a 2:1 ratio, but claiming the zero reference point is 60 dB?

SPL numbers are for 500 mm, others 100 mm and others for 10 mm. One device is rated using an IEC 318 coupler which the speaker clamps into. This is all from just one manufacturer!

..... Phil

es, both in dB but with a 2:1 ratio, but claiming the zero reference point is 60 dB?

articular purposes. The table tells you which it is and the offset in this case is 60dB above zero dB SPL.

e SPL numbers are for 500 mm, others 100 mm and others for 10 mm. One devi ce is rated using an IEC 318 coupler which the speaker clamps into. This i s all from just one manufacturer!

ulators/4153

Yes, I saw that, but this is not going in any ears other than an elephant's perhaps.

An inch in diameter. This is not the same maker, PUI vs. CUI, but PUI has many different testing setups.

I'm going to ask the mechanical engineer if he is happy trying to mount the CUI disk. The only ones that come with mounting holes are much larger. I guess they expect you to make an opening in your case to mount this. Mayb e it can be stuck to the board with double sided tape. I'm tired of lookin g at speakers that don't do what I need. This one is close enough. A 260

specified. The fundamental is stronger anyway, so this should work ok. N ow I just have to figure out how to drive 8 ohms without too much power los s. I'd sure rather have a 32 ohm speaker.

This one is interesting. The data sheet didn't give a resonant frequency. I find the frequency ratings are often fantasy if they give a curve. The PUI web site says the resonant frequency is 300 Hz which should work ok for the 260 Hz fundamental. It will be much easier to drive with lower curren t if I can believe the specs.

Still not easy to mount compared to the surface mount transducers someone h ad originally picked, but at least it's not larger than the PCB.

Thanks for the advice.

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ok for the 260 Hz fundamental. It will be much easier to drive with lower current if I can believe the specs.

The makers have assumed anyone buying such items has that.

Shame about arrogant jerks off like you.

..... Phil

re - not even a baffle. Add either and the difference is huge.

y.

inserts are damn near flat impedance.

rk ok for the 260 Hz fundamental. It will be much easier to drive with low er current if I can believe the specs.

Geeze, it didn't take much this time. Or maybe I made a mistake of thankin g you. No, the mistake clearly was conversing with you. Yup. That was it . lol No one can say you aren't entertaining.

But after a while it does get old. I'm not actually looking forward to the tired string of profanities that will be the response to this post.

Have you ever come up with any new insults or profanities? Do you have a s et list you pick from? Sort of like one of those dolls with the pull strin g that play a different track from a record each time it is pulled. Yeah, that's pretty much what you are Phil. A Chatty Cathy doll... with profanit ies

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sure - not even a baffle. Add either and the difference is huge.

ncy.

ic inserts are damn near flat impedance.

work ok for the 260 Hz fundamental. It will be much easier to drive with l ower current if I can believe the specs.

** Odd Mr C. does not think he deserves the tile "arrogant jerk off "?

Then goes posting even more proof that it was clearly FAIR COMMENT.

Guess he never learnt how to take criticism over his appalling manners as a kid - indulgent, narcissistic parents at play here for sure.

Just threw giant tantrums and got what he wanted -every time.

Jerk offs just gonna jerk.

..... Phil

losure - not even a baffle. Add either and the difference is huge.

uency.

mic inserts are damn near flat impedance.

e.

d work ok for the 260 Hz fundamental. It will be much easier to drive with lower current if I can believe the specs.

a kid - indulgent, narcissistic parents at play here for sure.

And then he starts talking about himself in the second person. Very, very odd.

It really is funny that Phil insists in behaving this way. I wonder what s ort of mental disability he has. Virtually everyone in the group acknowled ges he has this malfunction. They just excuse it because Phil has some par ticular knowledge that others don't. That results in reinforcing his behav ior.

You know he can't behave this way with the general public. He would have b een banned from every store in town if he did. So clearly his disability i s limited to online groups. Too bad for us.

Too bad he isn't capable of giving actual useful advice instead of insults too.

Here's a link that shows how the pros do it !

A small loudspeaker in a box - the enclosure will make a difference, the ratings are legible on the speaker.

Not suggesting you use this, but it may help you choose a suitable part. I think the parts you are looking at will not be loud enough at 250Hz ish.

MK

embedded in equipment to produce simple beep sounds. One device from CUI has this rating on it.

K, 1.2K Hz

rhaps. Are they saying it will produce 93 dB of sound when driven with 1 wa tt perhaps? But then they mention 0.1 w. Is 0.1 watt the power input to g et 93 dB of sound at 5 cm?

nd Fo at the low end which seems to be the resonant frequency rather than a -3 dB point.

dle C ~250 Hz) along with a few harmonics with a reasonably easy method of mounting and not eat up too much space.

Thanks,

This is the one I'm currently looking at. Phil says the frequency response of such units is fairly flat, but if it's made for headphones, maybe the m ax volume won't be loud enough.

It claims 115 dBA at 1 cm so 95 dbA at 10 cm with 1 mW input, 20 mW rated i nput level, 30 mW max.

Am I totally missing the point with this device? 95 dBA should be plenty l oud for our purposes.