How to HFD five Hypex FA502 plate amp (for active subwoofer only)

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kalbi
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Lid geworden op: zo 11 mar 2018, 3:08

How to HFD five Hypex FA502 plate amp (for active subwoofer only)

Berichtdoor kalbi » zo 11 mar 2018, 4:31

As FA502 not available yet therefore I didn't ask Hypex.

I am planning to replace plate amps for five active subs:

1. Sub A - one pairs of 2x10" driver, sealed, to handle 40Hz to 120Hz, fourth order
2. Sub B - three units of 4x12" driver, sealed and isobaric design, 40Hz and below, fourth order
3. Analogue output from pre-amp
4. Gain of power amp - 26.5db

Sub config:
Left channel - Sub A -> Sub B
Right channel - Sub A -> 2x Sub B (stacked)

Tools:
I've ordered Dayton mic and Focusrite Scarlett Solo, and installed 4.62 HFD.

I've read HDF maunal, and had questions below:

1. Butterworth vs. Bessel, which is best for my application?

2. The manual said that remote link is option between left and right channel for analogue daisy chain, then how to measure and correct low frequency for both left and right channel via USB. This is because only one plate amp connected via sound card.

3. I'll be grateful if someone could provide a data file (assuming a flat response, 120Hz and below) to upload to the 4.62 HDF as a reference, and I'll modify from there?

4. What other factors should I consider and info should I provide?

Thank you for reading and suggestions!

MarcelvdG
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Re: How to HFD five Hypex FA502 plate amp (for active subwoofer only)

Berichtdoor MarcelvdG » zo 11 mar 2018, 15:28

What does HFD stand for? A free online dictionary lists 25 meanings (from Honolulu Fire Department to House of Flying Daggers), but none seem applicable.

https://acronyms.thefreedictionary.com/HFD

toetertje
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Re: How to HFD five Hypex FA502 plate amp (for active subwoofer only)

Berichtdoor toetertje » zo 11 mar 2018, 15:30

Hfd staat voor Hypex filter designer.

MarcelvdG
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Re: How to HFD five Hypex FA502 plate amp (for active subwoofer only)

Berichtdoor MarcelvdG » zo 11 mar 2018, 17:03

OK, then here is my take on the first question. I have never used anything from Hypex, so I can only answer generic questions that are not specific to Hypex.

1. I'd go for Butterworth. Unless the differences between the path lengths from the mid/high loudspeakers and the subwoofers to your ears are much smaller than the wavelength at the crossover frequency, the system will have a poor phase response around cross-over anyway, so I don't see the advantage of using Bessel. Besides, only low-pass Bessel filters have a very good phase response, Bessel high-pass filters have not.

2. to 4. No idea.

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ds23man
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Re: How to HFD five Hypex FA502 plate amp (for active subwoofer only)

Berichtdoor ds23man » zo 11 mar 2018, 17:24

Why this strange sub construction? :think: :think: :think: :think:
Fusion Filterdesign

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Leeuwarden
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Re: How to HFD five Hypex FA502 plate amp (for active subwoofer only)

Berichtdoor Leeuwarden » zo 11 mar 2018, 18:48

Waarom in het Engels?
"Ik heb het nog nooit gedaan, dus ik denk dat ik het kan!" ***Pippi Langkous***

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Re: How to HFD five Hypex FA502 plate amp (for active subwoofer only)

Berichtdoor pappaleo » zo 11 mar 2018, 18:52

Leeuwarden schreef:Waarom in het Engels?

Why. :lol:

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Ah!buis
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Re: How to HFD five Hypex FA502 plate amp (for active subwoofer only)

Berichtdoor Ah!buis » zo 11 mar 2018, 19:14

Leeuwarden schreef:Waarom in het Engels?
Ohw, :o is 't Engels :?
Dat was me nog helemaal niet opgevallen :lol:
Anne
Eén plaatje > 1000 woorden :-)

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Re: How to HFD five Hypex FA502 plate amp (for active subwoofer only)

Berichtdoor Leeuwarden » zo 11 mar 2018, 19:47

Ja precies.
"Ik heb het nog nooit gedaan, dus ik denk dat ik het kan!" ***Pippi Langkous***

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ds23man
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Re: How to HFD five Hypex FA502 plate amp (for active subwoofer only)

Berichtdoor ds23man » zo 11 mar 2018, 20:12

Leeuwarden schreef:Ja precies.


Ja krekt...
Fusion Filterdesign

kalbi
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Re: How to HFD five Hypex FA502 plate amp (for active subwoofer only)

Berichtdoor kalbi » ma 12 mar 2018, 9:36

MarcelvdG schreef:OK, then here is my take on the first question. I have never used anything from Hypex, so I can only answer generic questions that are not specific to Hypex.

1. I'd go for Butterworth. Unless the differences between the path lengths from the mid/high loudspeakers and the subwoofers to your ears are much smaller than the wavelength at the crossover frequency, the system will have a poor phase response around cross-over anyway, so I don't see the advantage of using Bessel. Besides, only low-pass Bessel filters have a very good phase response, Bessel high-pass filters have not.

2. to 4. No idea.


Thanks for the recommendation! Good to know where should I begin with!

I'm using a bookshelf limited low speakers, and integrated the subs in add-on mode.

kalbi
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Lid geworden op: zo 11 mar 2018, 3:08

Re: How to HFD five Hypex FA502 plate amp (for active subwoofer only)

Berichtdoor kalbi » ma 12 mar 2018, 9:47

ds23man schreef:Why this strange sub construction? :think: :think: :think: :think:


I am looking at upgrading my existing system with minimum costs, and fusion plate amp allow me to directly digital the subs after I've familiarised with how analogue works.

The Hypex HFD provide a mean for me to configure, measure and monitor individual subs on a single platform, and sum them all. :D

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ds23man
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Re: How to HFD five Hypex FA502 plate amp (for active subwoofer only)

Berichtdoor ds23man » ma 12 mar 2018, 9:53

With crossover points this close you will never get it right or you must use 48db/oct filtering minimum.
Fusion Filterdesign

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Henkjan
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Re: How to HFD five Hypex FA502 plate amp (for active subwoofer only)

Berichtdoor Henkjan » ma 12 mar 2018, 10:05

maybe this software can be helpfull:
http://andyc.diy-audio-engineering.org/ ... index.html
An error does not become truth by reason of multiplied propagation, nor does the truth become error because nobody will see it" ― Mahatma Gandhi

kalbi
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Re: How to HFD five Hypex FA502 plate amp (for active subwoofer only)

Berichtdoor kalbi » ma 12 mar 2018, 14:19

Henkjan schreef:maybe this software can be helpfull:
http://andyc.diy-audio-engineering.org/ ... index.html


Thanks! This provide a good read, and another alternative to multiple subs config. What I'm thinking of is to add-on to one another, i.e. Sub A add-on to the limited full range, and Sub B add-on to Sub A. I don't have any experiences, not sure will it works.
Laatst gewijzigd door kalbi op ma 12 mar 2018, 14:36, 1 keer totaal gewijzigd.

kalbi
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Lid geworden op: zo 11 mar 2018, 3:08

Re: How to HFD five Hypex FA502 plate amp (for active subwoofer only)

Berichtdoor kalbi » ma 12 mar 2018, 14:34

ds23man schreef:With crossover points this close you will never get it right or you must use 48db/oct filtering minimum.


Do you mean the xover point between the two subs?

1. Sub A - one pairs of 2x10" drivers, sealed, to handle 40Hz to 120Hz, fourth order
2. Sub B - three units of 4x12" drivers, sealed and isobaric design, 40Hz and below, fourth order

I've made a mistake here, should be 30Hz or below. Why 30Hz and below? I'd done a measurement for Sub B more than a decade ago. Strangely that the sub only done well between 20Hz, I suspect that the plate amp wasn't powerful enough to move the 4x12" drivers.

The above configuration was just a starting point to embark, and figuring out best setting from there.

Moreover, all the settings on plate amps were analogue and for rough estimation only, very frustrating. Unlike the HFD, one can configure settings down to decimal point.

kalbi
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Lid geworden op: zo 11 mar 2018, 3:08

Re: How to HFD five Hypex FA502 plate amp (for active subwoofer only)

Berichtdoor kalbi » vr 14 sep 2018, 15:26

Time to close the loop.

I am very pleased with the purchase. And easy to setup too! At least for my usage.

As my main speakers is LR 4th order therefore it made thing easier.

I would see the set up as a three ways, i.e. full range, upper sub and lower sub.

All lowpass and highpass were LR 4th order, the only concern was matching the volume of the three ways. Done and happy.

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ds23man
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Re: How to HFD five Hypex FA502 plate amp (for active subwoofer only)

Berichtdoor ds23man » vr 14 sep 2018, 15:33

:foto: :foto:
Fusion Filterdesign

kalbi
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Re: How to HFD five Hypex FA502 plate amp (for active subwoofer only)

Berichtdoor kalbi » za 15 sep 2018, 10:37

I was lazy to pull out the gear for measurement. However, I listened to sweep from 20Hz to 300Hz, very pleased with the result!

The lowpass for the upper sub were between 80Hz and 120Hz, three presets. Highpass at 45Hz.

The lowpass for the lower sub was 45Hz too! One preset inverted, for comparison purpose.

Had set delay to the two subs closer to the listening position.

All LR 4th order, so phase wasn't an issue.

Unable to upload pictures. Is 2.8MB too big?

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ds23man
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Re: How to HFD five Hypex FA502 plate amp (for active subwoofer only)

Berichtdoor ds23man » za 15 sep 2018, 10:47

Max 1MB.
Fusion Filterdesign

kalbi
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Re: How to HFD five Hypex FA502 plate amp (for active subwoofer only)

Berichtdoor kalbi » za 15 sep 2018, 12:30

Thanks! Will resize.

kalbi
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Lid geworden op: zo 11 mar 2018, 3:08

Re: How to HFD five Hypex FA502 plate amp (for active subwoofer only)

Berichtdoor kalbi » za 15 sep 2018, 13:19

20180915_153605.jpg
20180915_153406.jpg
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kalbi
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Lid geworden op: zo 11 mar 2018, 3:08

Re: How to HFD five Hypex FA502 plate amp (for active subwoofer only)

Berichtdoor kalbi » zo 16 sep 2018, 3:14

Can someone tell me what does the capacitor and resister (???) Between the two drivers?

How does it affect or improve the sounds?

TIA
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kalbi
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Lid geworden op: zo 11 mar 2018, 3:08

Re: How to HFD five Hypex FA502 plate amp (for active subwoofer only)

Berichtdoor kalbi » ma 17 sep 2018, 4:19

It's to block high frequency.

In my application, can neglect it.


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