Measure twice, cut once. I want to build horn cabinets for Tannoy HPD coaxial drivers, but "the" GRF plans widely posted online are not as definitive as I had hoped.
I have found these - the simplest:
These - with added fillets to soften the corners (and much larger):
And these - with additional horn length and complexity:
In addition to their design, they are different sizes and intended for different size drivers. The last design specifically says just widen the cabinet to accommodate the 12" vs 10" driver - I did not know you could do it that simply. Does anyone have any first (or second) hand information about these different designs? I have read some reviews of the GRF-R as lacking low bass and being too "boomy" in mid-bass. Perhaps one of these alternative designs can help rectify this issue? Thank you for your input.
-Matt
I have found these - the simplest:
These - with added fillets to soften the corners (and much larger):
And these - with additional horn length and complexity:
In addition to their design, they are different sizes and intended for different size drivers. The last design specifically says just widen the cabinet to accommodate the 12" vs 10" driver - I did not know you could do it that simply. Does anyone have any first (or second) hand information about these different designs? I have read some reviews of the GRF-R as lacking low bass and being too "boomy" in mid-bass. Perhaps one of these alternative designs can help rectify this issue? Thank you for your input.
-Matt
Hi Matt, I have built something very similar to the taller design, but with an 18 inch rcf driver, low bass is amazing
Sorry, but there's no useful design (TS) specs except for Fs; still need at least Vas, Qts plus any series resistance in the power line such as an XO and or high output impedance amp.
Apologies. I found, maybe, the information you were asking about. I'm unsure how to verify it's accuracy.
http://www.44bx.com/tannoy/Tannoy_ts.html
I hope you find this helpful!
http://www.44bx.com/tannoy/Tannoy_ts.html
I hope you find this helpful!
👍😎 I remember there being one from way back when, though couldn't find it in a quick search, but still no clue which driver you're using, i.e. of the ones listed, they all have different specs and no guarantee your drivers will spec the same.
Ah. My hope was to use the HPD 385. That said, I’m not wed to it. The reason being that the third set of plans is only intended for the smaller drivers. If someone had information that suggests it was the superior design, I’d switch my intentions.
Well, as a general rule a BLH will be at least as big as its Vas = ~15 ft^3, but none of these horns appear to load to Fs, so presumably relying on some room gain.
Strictly at a glance, the small one loads to ~50 Hz in 2pi, so up to +6 dB against a wall and EQ it lower and acoustic pathlength good for the Monitor Gold 12"/~385, so lacking actual measured specs and again strictly at a glance, double the width of it to double net Vb to ~15 ft^3 and use tone controls/whatever EQ to 'taste'.
Strictly at a glance, the small one loads to ~50 Hz in 2pi, so up to +6 dB against a wall and EQ it lower and acoustic pathlength good for the Monitor Gold 12"/~385, so lacking actual measured specs and again strictly at a glance, double the width of it to double net Vb to ~15 ft^3 and use tone controls/whatever EQ to 'taste'.