Search found 1532 matches

by Scottmoose
Mon Feb 24, 2020 6:54 pm
Forum: Speakers
Topic: Tannoy Enclosure
Replies: 21
Views: 255

Re: Tannoy Enclosure

Well, under those conditions, and assuming a voltage source amplifier with the usual minor series R for wire, connections, the behaviour of the driver using the published T/S data is akin to free air / true IB conditions where in effect Qtc = Qts, Fb = Fs, F3 = 115Hz [nearly] and F6 = 70Hz [nearly]....
by Scottmoose
Sun Feb 23, 2020 6:22 pm
Forum: Speakers
Topic: Tannoy Enclosure
Replies: 21
Views: 255

Re: Tannoy Enclosure

And some vented. -Top is a flat alignment. Basically, again, the lowest possible F3. There are a couple of ways of doing it, this is just one. In most practical situations best avoided unless the room is well-damped and the speaker well away from walls. -Middle is a [relatively] well-damped alignmen...
by Scottmoose
Sun Feb 23, 2020 6:06 pm
Forum: Speakers
Topic: Tannoy Enclosure
Replies: 21
Views: 255

Re: Tannoy Enclosure

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 flat...
by Scottmoose
Sun Feb 23, 2020 10:25 am
Forum: Speakers
Topic: Tannoy Enclosure
Replies: 21
Views: 255

Re: Tannoy Enclosure

I've taken some points from your post that indicates a direction I think. Some tuning flexibility sounds a good idea. I'm assuming by modern standards, I'll be dealing with highish output impedances. Moderately so, but not spectacularly. Then there's the part about being acoustically efficient. Tha...
by Scottmoose
Sun Feb 23, 2020 9:57 am
Forum: Speakers
Topic: Tannoy Enclosure
Replies: 21
Views: 255

Re: Tannoy Enclosure

Yes. More useful than F3 (which is more or less useless as a practical guide, as Toole and others demonstrate).
by Scottmoose
Sat Feb 22, 2020 5:41 pm
Forum: Speakers
Topic: Tannoy Enclosure
Replies: 21
Views: 255

Re: Tannoy Enclosure

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...
by Scottmoose
Sat Feb 22, 2020 3:40 pm
Forum: Speakers
Topic: Tannoy Enclosure
Replies: 21
Views: 255

Re: Tannoy Enclosure

Well, as noted this rather depends on the output impedance of the amplifier being used with them. However, for the sake of a baseline, if we use the published data for the Gold 15in on the Tannoy Monitor enthusiast site (which assumes a pure voltage source, & no series R in circuit), then I'm not su...
by Scottmoose
Sat Feb 22, 2020 12:52 pm
Forum: Speakers
Topic: Tannoy R-GRF
Replies: 15
Views: 222

Re: Tannoy R-GRF

OK there's a whole bunch of pitfalls I'd like to avoid but I will be working with Tannoys. Yes, but which type? If you can tell us, we should be able to help. You've probably mentioned it elsewhere, but I don't often get chance to look at all the threads. Narrow vent tuning doesn't sound good so le...
by Scottmoose
Sat Feb 22, 2020 8:55 am
Forum: Speakers
Topic: Tannoy R-GRF
Replies: 15
Views: 222

Re: Tannoy R-GRF

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 (n...
by Scottmoose
Fri Feb 21, 2020 10:42 am
Forum: Speakers
Topic: Tannoy R-GRF
Replies: 15
Views: 222

Re: Tannoy R-GRF

Well, it's basically a trad. pro-audio style scoop-bin, which can work well enough, although are usually targeting gain through the mid & upper bass region (as you'd expect given the context & purposes for which they were developed) so outright LF extension is usually limited.
by Scottmoose
Wed Feb 05, 2020 4:16 pm
Forum: Buying and Selling
Topic: F/S Alpair 12P
Replies: 5
Views: 653

Re: F/S Alpair 12P

Drivers now sold. Many thanks to all for looking, and to those who bought the units; I hope you enjoy them! :)
by Scottmoose
Tue Feb 04, 2020 7:19 pm
Forum: Speakers
Topic: Ali Bastanis OB testing & results
Replies: 84
Views: 2009

Re: Ali Bastanis OB testing & results

Yes, but not often as you really need 16Gb RAM for any of the more interesting options. When I do -not subtle. And that's coming from Mr Cynical here.
by Scottmoose
Tue Feb 04, 2020 6:17 pm
Forum: Buying and Selling
Topic: FS Mark Audio (Markaudio) CHP-70 Gen.2 drive units (natural cone)
Replies: 11
Views: 536

Re: FS Mark Audio (Markaudio) CHP-70 Gen.2 drive units (natural cone)

All of the natural cone units now sold. I still do have some of the charcoal / black cone version however.

Many thanks for looking & to those who bought the drivers; I hope you enjoy them. :)
by Scottmoose
Tue Feb 04, 2020 9:30 am
Forum: Speakers
Topic: Ali Bastanis OB testing & results
Replies: 84
Views: 2009

Re: Ali Bastanis OB testing & results

Vic's a good bloke; I think I last saw him when I was at a mutual friend's place. He & Clive introduced me to the Bug Head player. One of the few absolute night & day moments I've ever had with digital audio. If it had a better interface & my PC was manly enough to run it, I'd probably use it all th...
by Scottmoose
Tue Feb 04, 2020 9:23 am
Forum: Speakers
Topic: Something Stirs in the Workshop
Replies: 67
Views: 13191

Re: Something Stirs in the Workshop

Aren't those impressions of Tony's for their K78-34 (a different cap to the White Line)? From the look of it, he's got some White Lines in & is currently trying them, but has not yet posted any views on them. Don't get me wrong, not knocking them at all; if they're built to the spec. claimed, should...