audio-talk

Duct length for a given tuning frequency is a function of box volume and vent CSA; typically with WinISD once you've got your driver data entered into the database, you'll enter your box volume & tuning frequency; you can then adjust the number and diameter of the vent[s]; it will calculate the...

Are the old cabinets going to be scrapped ? (No-I don't want them . :) ) Yes. I'm amazed they lasted this long. Tannoy Amesbury cabinet? Didn't know that one until you mentioned it. It seems a version of the Lancaster. In some respects, that's where I'm headed but hopefully with some knowledge or s...

Optimal transient response also is a tempting thing to chase but I'm guessing that will be at the expense of group delay No, the two go together. Also tone is very much associated with low group delay , in my books. Scott had two examples where one was maximally flat group delay and the other optim...

I don't have much time, but a few visual examples. Three different sealed boxes; I used the MA Alpair 12PW as the example drive unit. The three system alignments are the ones mentioned above: Qtc = 0.707 (Butterworth). Maximally flat response, lowest possible F3* Qtc = 0.577 (Bessel). Maximally fla...

Looks very nice. Any chance we can see what's in it and a circuit maybe?

Hi Stephen I am a complete amateur when it comes to speakers, but one piece of advice I can offer - take the room interaction seriously. Find out what your room mode(s) are and how peaky. I think you are already aware of this, but keep it in mind when deciding which way to go. My experiments with s...

Thanks Scott. That was very helpful. I've been doing a lot of reading and some of it anecdotal as to what sort of cabinets seem to make them work well and that would imply things on the larger side especially for the older 15" monitor golds with the hard edge. One thing that comes up is some ki...

I would suggest a moderately, but not heavily, damped alignment likely to be the order of the day then. Stud walls can leach low frequencies. For vented boxes, a duct with adjustable length is very useful here as it gives some tuning flexibility. Since amplifier output impedances were often high, a...

Thanks guys. That's a lot of info for me to absorb which I'll do later. I'll have to understand what these tuning frequencies mean and how they relate to frequency response. On my limited understanding, I thought that reponse drops off more rapidly in a ported box than a sealed one so tuning for 60 ...

What started as a Tannoy R-GRF enclosure has met a dead end in another thread. So let me start again. I have Tannoy !5" golds I like a lot and want them in a vented box no more than 600mm wide. What became apparent is this stuff can be modelled and accurately enough so I don't need to build for...

OK. Well I think that is the end of this thread coz it's not going to be a R-GRF so thread will be very misleading. I'm encouraged I think to build a proper vented box.

ed wrote: ↑Fri Feb 21, 2020 5:21 pm betwwen the waters.jpg

Just giving that a whirl. It's a keeper

I'm not Chris, and I generally hate working with old Tannoy DCs because (assuming they haven't drifted over time) they often want smaller enclosures than many of their owners believe. To a point this depends on intended location in the room and amplifier output impedance; be that as it may, a lot (...

Thanks Chris. I remember reading the rew thread and just did so again. From a measurement point of view, I should see if the IMP thing I have works with what I have already and see if it correlates with what I think I'm hearing as a sort of baseline. I guess in some ways I should start again with wh...

Now if you were to go with a 12" driver as suggested by Mark you could build a pair the 12" Monacor SP-312CX coaxial MLTL speakers as featured in the thread below? These will certainly deliver the bass lacking in the proposed Tannoy cabinets. I know they are a vented cabinet design of whi...