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Binks Audio Test CD to check driver "health"

 

I've loaded the entire CD onto my PC and wish to run my speakers through the tones to check how they are performing and isolate any drivers not working well (I suspect one Philips driver is intermittent). I am not trained on or possess any calibration or testing equipment - this is listening testing only). Is it as simple as playing each tone and listening? Can anyone break down the tones into buckets associated with each driver so I can focus my attention on that specific driver as they play?
William Schnaars
 

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If you get a response can you share it with me because I would like to do the same thing.

I don’t have DQ10’s but I have 2 pairs of Dahlquist M909’s I use.

Thanks

Bill

?

From: [email protected] <[email protected]> On Behalf Of w e via groups.io
Sent: Friday, January 28, 2022 10:18 AM
To: [email protected]
Subject: [DahlquistSpeakers] Binks Audio Test CD to check driver "health"

?

I've loaded the entire CD onto my PC and wish to run my speakers through the tones to check how they are performing and isolate any drivers not working well (I suspect one Philips driver is intermittent). I am not trained on or possess any calibration or testing equipment - this is listening testing only). Is it as simple as playing each tone and listening? Can anyone break down the tones into buckets associated with each driver so I can focus my attention on that specific driver as they play?

 

Just tread lightly as constant tones are pretty brutal on speakers. They really are not designed for anything constant at higher drive levels to say the least. Plus if you don't already have one pick up a db meter. As depending on the state of your ears and the room. Just because you don't hear it doesn't necessarily mean it isn't there. Which without the meter can rapidly lead to voice coil burnout if your not careful. The full sweeps on those test sets are usually a great asset. And mucho safer and shorter in duration at any given frequency. And will point out all kinds of issues room wise. Like the resonance of whatever is in the area that might decide to buzz. Like grill or cabinet buzzes, etc. Plus it will give you insight into your low end reproduction capabilities. Continuous tones are useful for many things. Like for poking around to find unforseen surround glue joint issues, etc on drivers. But the levels have to be kept low or the voice coil of the driver will freak.? I try to limit usage to setting level controls which unfortunately that has to be done at lower volumes. Which granted is not the normal range used for listening on the main volume control. But it sets a good point of departure for further tweeking by ear. So....

DD



On Fri, Jan 28, 2022, 11:23 AM William Schnaars <chromedhemi@...> wrote:

If you get a response can you share it with me because I would like to do the same thing.

I don’t have DQ10’s but I have 2 pairs of Dahlquist M909’s I use.

Thanks

Bill

?

From: [email protected] <[email protected]> On Behalf Of w e via
Sent: Friday, January 28, 2022 10:18 AM
To: [email protected]
Subject: [DahlquistSpeakers] Binks Audio Test CD to check driver "health"

?

I've loaded the entire CD onto my PC and wish to run my speakers through the tones to check how they are performing and isolate any drivers not working well (I suspect one Philips driver is intermittent). I am not trained on or possess any calibration or testing equipment - this is listening testing only). Is it as simple as playing each tone and listening? Can anyone break down the tones into buckets associated with each driver so I can focus my attention on that specific driver as they play?

 

Samuel is correct. Not the best way but if you decide to do this Keep the level low. the nominal crossovers frequencies are:
Woofer 30-400Hz
Midrange 400-1kHz
Mid dome 1kHz- 6kHz
Tweeter 6kHz- 12kHz
Super tweeter 12kHz 30kHz ( not likely to hear any of these )

The tones within each these ranges will be heard from the corresponding driver. A toilet paper tube or something similar held to your ear and near or over the specific driver will help funnel the sound to your ear.?
There is considerable overlap between drivers in the crossover. For example you will hear frequencies outside the 400-1kHz range coming from the midrange. Distortion may be hard to isolate because all the drivers will be operational during this test.
driver.

Below is an example of what you will hear from each driver. Of course the vertical axis is loudness. In general you will hear the range between where the driver is 10dB down for the middle of its range.
Blue-woofer
Brown-midrange
Green-middome
Purple-Tweeter
The ?supertweeter is not shown
You may notice the midrange and the middle have significant overlap in the range 750-2700hz

DQ10 individual driver responses.jpg

 

Charlie,

Are these plots from measured electrical data at the crossover connections to the speakers or is this an electrical simulation using nominal speaker impedances?

Steve

On Sunday, January 30, 2022, 02:57:01 PM EST, Charlie Conger <ctconger@...> wrote:


Samuel is correct. Not the best way but if you decide to do this Keep the level low. the nominal crossovers frequencies are:
Woofer 30-400Hz
Midrange 400-1kHz
Mid dome 1kHz- 6kHz
Tweeter 6kHz- 12kHz
Super tweeter 12kHz 30kHz ( not likely to hear any of these )

The tones within each these ranges will be heard from the corresponding driver. A toilet paper tube or something similar held to your ear and near or over the specific driver will help funnel the sound to your ear.?
There is considerable overlap between drivers in the crossover. For example you will hear frequencies outside the 400-1kHz range coming from the midrange. Distortion may be hard to isolate because all the drivers will be operational during this test.
driver.

Below is an example of what you will hear from each driver. Of course the vertical axis is loudness. In general you will hear the range between where the driver is 10dB down for the middle of its range.
Blue-woofer
Brown-midrange
Green-middome
Purple-Tweeter
The ?supertweeter is not shown
You may notice the midrange and the middle have significant overlap in the range 750-2700hz
 

Nope, these are nearfield acoustic measurements. Even though the drivers were acoustically shielded for one another and / or acoustically isolated these is significant crosstalk. Thus any measurement that is down more than 15dB or so should be viewed as crosstalk influenced. the woofer is the sole exception as it was much better isolated.?

The biggest crosstalk occurs between the Phillips midrange and the MB mid dome at the lower frequencies.

However, the information is still useful to determine general crossovers frequencies and slopes.?
 

Really great data!? Thanks.? Now I understand the "lumps" that should not be related to the electrical characteristics.

Steve

On Sunday, January 30, 2022, 07:17:38 PM EST, Charlie Conger <ctconger@...> wrote:


Nope, these are nearfield acoustic measurements. Even though the drivers were acoustically shielded for one another and / or acoustically isolated these is significant crosstalk. Thus any measurement that is down more than 15dB or so should be viewed as crosstalk influenced. the woofer is the sole exception as it was much better isolated.?

The biggest crosstalk occurs between the Phillips midrange and the MB mid dome at the lower frequencies.

However, the information is still useful to determine general crossovers frequencies and slopes.?

 

Thanks for this Charlie. Great info. to help guide me (and I'll keep that volume low!).

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