aashish351
Well-Known Member
Hi All,
DIY audio is a strange addiction. Despite failed & average attempts, you keep going at it. Here is the latest one I have started. It started with spotting a sale thread of the Philips Hi-Q type driver from Boston Acoustics (HQ48414P) by FM Analogadikt. I thought I would lay low on DIY for some time after the moderate to negligible success of my 3" full range TL project and a very poorly attempted open baffle, but, there is something about full-range single-driver crossover-less speakers that simply appeals to me a lot. To ensure the relative success of this project, I have completely relied on the design/construction details from the suggested chapter of Philips "Building Hi-Fi Speakers" book. This was kindly shared by FM analogadikt as part of the driver sale and he has been extremely helpful in clarifying any doubts I have had along the way. The driver model used by Philips for the project is the MC9710 which is supposed to be same as the HQ48414P. Here are the specification of the Boston driver (you can also check out the sale thread for the pictures of driver http://www.hifivision.com/sale-owner/58043-3-pairs-boston-8-full-range-drivers.html):
RMS power 25 watts
Max power 40 watts
Impedance 8 Ohms
SPL @ 1W/1m 93 dB
The portion of the book I received is sufficient and excellent at describing how to go about the cabinet build and I have been following it almost to the script. The only difference is that I am using 18mm MDF instead of 15mm as suggested in the book. But the internal dimensions are the same as recommended. So are the port dimensions, place of mounting driver and port etc. I might experiment with the stuffing a little based on the end result. The design allows for screwing the front baffle on battens using a foam gasket so that it can be opened for changes to stuffing or service. And the battens based design is very intelligent as it allows screws to be inserted from inside (except the baffle) which keeps the exterior look clean.
The dimensions of the finished box will be 546 x 336 x 314 (HWD). I am also constructing a suitable height stand with the leftover MDF. Some initial pictures are attached here. The remaining in larger size will be posted as a Google photos album link soon as the project moves along.
The first picture is of course the MDF cut into the required panels for two boxes. The second picture is the stand roughly 350mm high taking the total height of the speaker to 900mm to keep the driver at ear level. The stand top and bottom plate dimensions are the same as the enclosure to keep the profile same. But I will finish the stands in plain black and the enclosures in a better way (still to decide). The third & fourth picture is of the sides and bottom panels with battens fixed and the last one is these panels fixed together. Next will be the back and lastly front baffle. I am waiting for the terminals and port tubes to be delivered for making accurate cutouts before getting those panels fixed.
Cost of the project so far:
Drivers: 1000
MDF Sheet: 1350
Terminals, Port tubes, Foam Gasket: 1000 (Diyaudiocart)
DIY audio is a strange addiction. Despite failed & average attempts, you keep going at it. Here is the latest one I have started. It started with spotting a sale thread of the Philips Hi-Q type driver from Boston Acoustics (HQ48414P) by FM Analogadikt. I thought I would lay low on DIY for some time after the moderate to negligible success of my 3" full range TL project and a very poorly attempted open baffle, but, there is something about full-range single-driver crossover-less speakers that simply appeals to me a lot. To ensure the relative success of this project, I have completely relied on the design/construction details from the suggested chapter of Philips "Building Hi-Fi Speakers" book. This was kindly shared by FM analogadikt as part of the driver sale and he has been extremely helpful in clarifying any doubts I have had along the way. The driver model used by Philips for the project is the MC9710 which is supposed to be same as the HQ48414P. Here are the specification of the Boston driver (you can also check out the sale thread for the pictures of driver http://www.hifivision.com/sale-owner/58043-3-pairs-boston-8-full-range-drivers.html):
RMS power 25 watts
Max power 40 watts
Impedance 8 Ohms
SPL @ 1W/1m 93 dB
The portion of the book I received is sufficient and excellent at describing how to go about the cabinet build and I have been following it almost to the script. The only difference is that I am using 18mm MDF instead of 15mm as suggested in the book. But the internal dimensions are the same as recommended. So are the port dimensions, place of mounting driver and port etc. I might experiment with the stuffing a little based on the end result. The design allows for screwing the front baffle on battens using a foam gasket so that it can be opened for changes to stuffing or service. And the battens based design is very intelligent as it allows screws to be inserted from inside (except the baffle) which keeps the exterior look clean.
The dimensions of the finished box will be 546 x 336 x 314 (HWD). I am also constructing a suitable height stand with the leftover MDF. Some initial pictures are attached here. The remaining in larger size will be posted as a Google photos album link soon as the project moves along.
The first picture is of course the MDF cut into the required panels for two boxes. The second picture is the stand roughly 350mm high taking the total height of the speaker to 900mm to keep the driver at ear level. The stand top and bottom plate dimensions are the same as the enclosure to keep the profile same. But I will finish the stands in plain black and the enclosures in a better way (still to decide). The third & fourth picture is of the sides and bottom panels with battens fixed and the last one is these panels fixed together. Next will be the back and lastly front baffle. I am waiting for the terminals and port tubes to be delivered for making accurate cutouts before getting those panels fixed.
Cost of the project so far:
Drivers: 1000
MDF Sheet: 1350
Terminals, Port tubes, Foam Gasket: 1000 (Diyaudiocart)