Maplins close-out on Audax bass units - Page 2

richie00boy · 18th June 2004, 01:30 PM

Mark, you pretty much summed it up there anyway. Bigparsnip also added some good comments, particularly about the surround material.

Fs - too high. Not really much scope for boosting either.
Qts - high, but can be made sensible by Linkwitz Transform or -ve impedance, but useless if you want to go for a normal unaided vented box.
Vas - may be lower than the others, but put an AP210Z0 in the same size box and it will go lower and have lower Qtc. i.e. low Vas does not automatically equate to smaller cabinet - Qts plays a part here as well.

AP210Z0 in 18 litres sealed box
Qtc 0.8074
F3 63.9412
Fc 71.7648

AP210G6 in 18 litres closed box
Qtc 0.6463
F3 86.5931
Fc 78.5249

AP210M0 in 18 litres closed box
Qtc 1.5332
F3 68.8656
Fc 98.8413

mms is not a parameter I look at. Using a sealed box as an example, if 2 drive units when in a box result in the same Qtc and Fc then they will sound the same (with an obvious caveat on SPL) even is one has mms, Qms or Qes 10x that of the other. Impulse response is dictated by Qtc, if these are the same, end of story.

Fs, Qts and Vas are all you need to know about in terms of how it will sound (disregarding SPL).

The Audax data sheet (like all other manufacturers data sheets) measures frequency response in a closed box, hence why resonance has shifted up the band.

Mark25 · 18th June 2004, 02:34 PM

Thanks for that comprehensive breakdown Richie. I'm away for 3wks now, should be interesting to see how this thread is developing when i get back.

Matttcattt · 18th June 2004, 05:03 PM

Quote:

Originally posted by Mark25
Thanks for that comprehensive breakdown Richie. I'm away for 3wks now, should be interesting to see how this thread is developing when i get back.

If I were you, I would be worried that the drivers were discontinued and out of stock by the time that I got back.

I buy first, plan later. Then you can use the left over drivers as an excuse for the next project...

Mark25 · 18th June 2004, 07:46 PM

as mentioned in a previous post, i already have 2xG6 and 2xZ0 delivered, i just want to try and make sure i'm not missing anything special about the M0. I'm visiting the "Island" anyway, so will be ideally placed to "top up".
Mark

Matttcattt · 18th June 2004, 10:25 PM

Quote:

Originally posted by Mark25
as mentioned in a previous post, i already have 2xG6 and 2xZ0 delivered, i just want to try and make sure i'm not missing anything special about the M0. I'm visiting the "Island" anyway, so will be ideally placed to "top up".
Mark

Oh, must have missed that.

nubbins · 28th June 2004, 01:33 AM

Price reduction :

AP130MO £4.98
AP130G2 £4.98
AP130Z0 £4.98

18th June 2004, 02:34 PM	#12
Mark25 diyAudio Member Join Date: Feb 2002 Location: The Netherlands (Friesland)	Thanks for that comprehensive breakdown Richie. I'm away for 3wks now, should be interesting to see how this thread is developing when i get back. __________________ We will pay the price, but we will not count the cost...

18th June 2004, 07:46 PM	#14
Mark25 diyAudio Member Join Date: Feb 2002 Location: The Netherlands (Friesland)	as mentioned in a previous post, i already have 2xG6 and 2xZ0 delivered, i just want to try and make sure i'm not missing anything special about the M0. I'm visiting the "Island" anyway, so will be ideally placed to "top up". Mark __________________ We will pay the price, but we will not count the cost...

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18th June 2004, 01:30 PM	#11
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Mark, you pretty much summed it up there anyway. Bigparsnip also added some good comments, particularly about the surround material. Fs - too high. Not really much scope for boosting either. Qts - high, but can be made sensible by Linkwitz Transform or -ve impedance, but useless if you want to go for a normal unaided vented box. Vas - may be lower than the others, but put an AP210Z0 in the same size box and it will go lower and have lower Qtc. i.e. low Vas does not automatically equate to smaller cabinet - Qts plays a part here as well. AP210Z0 in 18 litres sealed box Qtc 0.8074 F3 63.9412 Fc 71.7648 AP210G6 in 18 litres closed box Qtc 0.6463 F3 86.5931 Fc 78.5249 AP210M0 in 18 litres closed box Qtc 1.5332 F3 68.8656 Fc 98.8413 mms is not a parameter I look at. Using a sealed box as an example, if 2 drive units when in a box result in the same Qtc and Fc then they will sound the same (with an obvious caveat on SPL) even is one has mms, Qms or Qes 10x that of the other. Impulse response is dictated by Qtc, if these are the same, end of story. Fs, Qts and Vas are all you need to know about in terms of how it will sound (disregarding SPL). The Audax data sheet (like all other manufacturers data sheets) measures frequency response in a closed box, hence why resonance has shifted up the band.

28th June 2004, 01:33 AM	#16
nubbins diyAudio Member Join Date: May 2004 Location: .	Price reduction : AP130MO £4.98 AP130G2 £4.98 AP130Z0 £4.98

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