DIY sub using Peerless driver available locally

[kamal6767]

Gijo whats the price of this sub amp... and can you guide me the address of Mahindra in Pune

 

[Gijo George]

Sorry kamal,
Was on holiday for two weeks. Please pm GeorgeO for the plate amp details and availability. He coordinated the buy for us.
cheers

 

[anm]

t.antony - what is your experience with the inuke amp? Have you auditioned it with a sub? Is it noisy?

 

[t.antony]

t.antony - what is your experience with the inuke amp? Have you auditioned it with a sub? Is it noisy?

I saw that amp in a DJ setup, driving 18" pro drivers. Power seems adequate for sub duty as there could be more headroom for the amp in a HT setup.

On closer inspection I could hear the fan noise - might be a nuisance for home use

 

[rpanand25]

Gijo

As Rajesh said, Class D amps using SMPS power supplies are lighter by design-I have on which is more powerful but less than half the weight of an older one with a transformer.

I am just getting into the nitty gritty of DIYsub build. can u just indicate the various points of difference between class D amp for sub and class AB amp for the same. I donot want to go through the text book theory on designing D or AB class amplifier. I want to know the practical advantage/disadvantage of both the designs for sub application.

 

[dosai]

I am looking at venturing into the crazy DIY world too...starting with a SUB for my setup.

Any help will be awesome

Dosai

I am just getting into the nitty gritty of DIYsub build. can u just indicate the various points of difference between class D amp for sub and class AB amp for the same. I donot want to go through the text book theory on designing D or AB class amplifier. I want to know the practical advantage/disadvantage of both the designs for sub application.

 

[sbg]

Its the same driver and design I used for my ported sub woofer as described in this thread - http://www.hifivision.com/diy/19965-my-ported-subwoofer.html

Here are the construction plans.

Front panel is made of two sandwiched sheets

For the port, try to get a pvc pipe with internal dimension close to 9cm (3.5 inches). Length of the port is 12 inches.

The dimensions seems to be fine for a sealed sub as well. If planning to build one, try to acquire a plate amp of 200w or above. For ported version as in the plan, 150w should be sufficient. I am currently using 120w amplifier.

Here are the TS specs of the driver from the manufacture's data sheet. I could not find any model number on the driver and it's simply referred as a 4ohm 12 inch sub woofer in the spec sheet I received from jeetubhai.

Fs : 24.94 Hz
Re : 3.68 ohms
Qms : 1.17
Qes : 0.45
Qts : 0.32
Le : 0.53 mH
Vas : 256.35 liters
Mms : 59.71 gms
Cms : 678
BL : 8.80
SPL : 94.7 dB
Sd : 518.75 cm2

I just got started today to do some Cutlist on my left-over MDF sheet for this sub ,these internal dimensions (16.5x16.5x16.5 ) does not fit, in the sheet I have.So,Tired out alternatives to change the box dimension based on these specs,but found the Volume quite different.

Per these calculators (here) and here the volume needed seems around 114-115 Lts/119lts including port volume (i.e 4 foot^3) for ported sub and around 66 lts(2.33 foot^3) for Sealed ( EBP is around 55.56 -so, ok for sealed or vented ). now, I'm not sure if 16.5x16.5x16.5 enclosure for ported sub is the correct Dimension - this should be around 20x20x18.2 with 15in port length(4" dia)

Can someone guide me , on where I could be wrong.

 

[t.antony]

I just got started today to do some Cutlist on my left-over MDF sheet for this sub ,these internal dimensions (16.5x16.5x16.5 ) does not fit, in the sheet I have.So,Tired out alternatives to change the box dimension based on these specs,but found the Volume quite different.

Per these calculators (here) and here the volume needed seems around 114-115 Lts/119lts including port volume (i.e 4 foot^3) for ported sub and around 66 lts(2.33 foot^3) for Sealed ( EBP is around 55.56 -so, ok for sealed or vented ). now, I'm not sure if 16.5x16.5x16.5 enclosure for ported sub is the correct Dimension - this should be around 20x20x18.2 with 15in port length(4" dia)

Can someone guide me , on where I could be wrong.

The ported enclosure volume is reduced taking into account room gain and wall & floor reflections. While it works reasonably well in smaller rooms ( length ~ 12 to 15ft), for larger rooms the sealed version would give more bass extension with the current box dimensions.

 

[sbg]

Thanks Antony,

I think,you did speak on these earlier. but, anyway,I went ahead and started off on sealed box yesterday. With 24x15x17(HxWXD) dimensions ( 1 inch thick ) - comes to about 70 Lts. These will be needing Internal bracing , so should come down a few lts.