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Keskusteluryhmät

7040A + 8030B

r0cky, muokattu 7 Vuodet sitten.

7040A + 8030B

Youngling Viestejä: 4 Liittymispäivä: 7.6.2015 Viimeisimmät viestit
Why is the 7040A not recommended for 8030B whereas the 7050B is? The specifications that I have from the Operating Manual, show that the peak SPL from the two subs is identical (SPL being a reason given by Ilkka in another thread)?

7040A 50W 6.5" 100dB SPL @ 1m tone
7050B 70W 8" 100dB SPL @ 1m tone

8020C 20W 4" 96dB SPL @ 1m tone, 95dB noise, 105dB peak music (pair)
8030B 40W 5" 100dB SPL @ 1m tone, 97dB noise, 108dB peak music (pair)

I currently own the 8020B but would like to change them for 8030B with ideally the 7040A sub-woofer.
ilkka-rissanen, muokattu 7 Vuodet sitten.

Re: 7040A + 8030B

Yoda Viestejä: 2564 Liittymispäivä: 23.3.2009 Viimeisimmät viestit
Hi,

Actually the 7050B plays louder and also has better extension. If you look at the specifications, you will notice that the frequency range for the SPL measurements is different, from 40 Hz to 85 Hz for the 7040A and from 30 Hz to 85 Hz for the 7050B.

Of course you can use 7040A with 8030B if you wish. Our recommendation is just a recommendation, not a strict rule.
r0cky, muokattu 5 Vuodet sitten.

Re: 7040A + 8030B

Youngling Viestejä: 4 Liittymispäivä: 7.6.2015 Viimeisimmät viestit
Hi Ilkka,

Many thanks for your quick reply as always. :)

I do understand that it's just a recommendation, I was trying to relate that to the specifications.

I'm sure that the 7050B is louder, I was just trying to understand the only SPL specification in the Operating Manual:

7050B:
"Maximum short term sine wave SPL output averaged from 30 to 85 Hz, measured in half space at 1 meter = 100 dB"

7040A:
"Maximum short term sine wave SPL output averaged from 40 to 85 Hz, measured in half space at 1 meter = 100 dB"

The frequency responses are different of course, but is not the maximum SPL average 100dB the same in each case?
Cheers,
ilkka-rissanen, muokattu 7 Vuodet sitten.

Re: 7040A + 8030B

Yoda Viestejä: 2564 Liittymispäivä: 23.3.2009 Viimeisimmät viestit
Hi,

Since the output of the subwoofer typically goes down as the frequency goes smaller, SPL values below 40 Hz are smaller and bring the average down. So if you would use the same 40 Hz to 85 Hz bandwidth also for the 7050B, the SPL number would be higher than 100 dB.
r0cky, muokattu 7 Vuodet sitten.

Re: 7040A + 8030B

Youngling Viestejä: 4 Liittymispäivä: 7.6.2015 Viimeisimmät viestit
Hi Ilkka,

Is there any chance of obtaining the frequency response curves of the max SPL for the 7040A and 7050B? Out of curiosity is the max SPL circuitry limited, or at a measured distortion (or other) cut-off?

In parallel to this thread, I've also had contact with one of your distributors. They eluded to the possibility that the continuous SPL ratings of the 7040A were different to that of the 7050B, whereas the peak's were not. Is that a red-herring?
ilkka-rissanen, muokattu 7 Vuodet sitten.

Re: 7040A + 8030B

Yoda Viestejä: 2564 Liittymispäivä: 23.3.2009 Viimeisimmät viestit
Hi Ilkka,

Is there any chance of obtaining the frequency response curves of the max SPL for the 7040A and 7050B?

Unfortunately that is confidential information.

Out of curiosity is the max SPL circuitry limited, or at a measured distortion (or other) cut-off?

Our products contain many sort of protection and soft-clipping circuits which ensure that the audio quality remains at high level and product doesn't self-destruct even in the case of unintended or intended misuse.


In parallel to this thread, I've also had contact with one of your distributors. They eluded to the possibility that the continuous SPL ratings of the 7040A were different to that of the 7050B, whereas the peak's were not. Is that a red-herring?

These products are very close to each other in both, continuous (protection circuit limited) and peak output level. The main differences are in frequency response bandwidth, connectivity and physical size.
r0cky, muokattu 7 Vuodet sitten.

Re: 7040A + 8030B

Youngling Viestejä: 4 Liittymispäivä: 7.6.2015 Viimeisimmät viestit

These products are very close to each other in both, continuous (protection circuit limited) and peak output level. The main differences are in frequency response bandwidth, connectivity and physical size.

Thanks. That is the conclusion that I had based on the more limited information available to me :)