Chienmortbb

Very wise. The team at Ashdown know their stuff and would have considered this in the design. I am just repairing my 15 year old After Eight combo and the thing that impressed me was how well the cooling has been thought out. No fans but a really well thought out design where the heatsink is bolted to the rear of the chassis. It not only has cooling vents, but the chassis is mounted on two spacers so that air can flow behind the chassis. There is also thermal compound between the heat sink and the chassis to improve heatflow between the two.

You need to look at the amp as it may be that one fan blows inwards, the other blows outwards. It depends on where they are placed.

If you look at the fans they will have an arrow on the top usually pointing to the direction of airflow.

Just a couple of points. Firstrly Channel 38 is a great call, but do pay your licence fee. Incidently, there are no plans yet but Channel 38 is earmarked for other use in the future. Just a bit of backgroud on 5GHz. That band was given to the Wireless Mic manufacturers for the development of Wireless mics shortly before Channel 69 was stolen. Sadly, in the early days of digital mics, few saw the benefit and so the band was unused. As a result a substatial part of it was given over to WiFi.

Bill is right the Delta/Alpha/Beta 10s are less than ideal for bass and unlikely to improve on the stock drivers. Remember the cabinet was tuned to get the best out of the drivers it was supplied with subject to the contraints of cost/the marketing department etc. As for the original Blue Line driver, it could well be a SICA but probably made in the far east under licence in the same way that Eminence do. The real clue is in the lettering on the back of the driver. The contries thta use the graphical writing style tend to favour serifed fonts whearas Western countries favour non -serifed characters. My advice is to put the original drivers back in.

Generally Aluminium tape is thicker and that negates the improved conductivity. However I agree that copper is better. Neither is any used for magnetic shielding but as most of the noise we get now is RF pulses from various appliances, that does not matter.

Sorry to ressurect a zombie thread but it is probably quite usual as the TRL072 IC used in the amp is a bit noisy. REpolacing it with a real audio opampo like OPA2134 will probably remove most of the hiss. I am reapiting mine at the moment so will pots here when I have done it and chnaged the Tl072 for an OPA2134.

It takes more work but aluminium tape is the best shielding. Th issue is that you cannot solder it ans there is none that I know of that has conductive adhesive.

Humbuckers reduce the i nduced mains hum. It is 60Hz in the USA, Canada, Japan but 50Hz in Europe. However you are correct ijn that most of the interference is EMI/RFI.

In the diary.

I am sure this is the right decision . I would have had to give it a miss being in the at risk group. Look forward to it later in the year.

I looked at those square handles but was not sure how well they were sealed. Presumably they are fine?

My sources say two things, If I, a chronic asthmatic that has had several bouts of pneumonia ( so callde co-morbidities) were in need of a respirator as was an otherwise fit 22 yera old and only one was available, guess who would not get it... moi. Secondly, all the advice was given because there are no powers to make us do something. That can (and will) change as an emergency bill passes. I predict it will be in place by next weekend.

I do agree about the mics Phil. I missed the fact that the singer was using a cheap Shure. That may be the best and cheapest upgarde initially I am now using the Solo from Sontronics. It is cheaper than the SM58 and made in Dorset. AKG and Sennheisers are also worth looking at. In fact I try to avoid the SM58 as it is OK, but IMHO is a very old design that is bettered by many less expensive mics these days.

My heart says go ahead but as someone in the "at risk" group, I would have to decline anyway.

I agree and the reason I suggested the Alto subs is that they have the DSP settings to match the Tops.

Sorry I was caught out by Alto’s numbering system. It is Tx212S. As you can see from the picture, it has a DSP setting for the 212 tops. https://www.gear4music.com/PA-DJ-and-Lighting/Alto-TX212S-Active-Subwoofer/34ZN

The S1 looks more conventional than most Bose products and ideal for your wife’s use. I must admit that I was thinking of the L1 type systems.

The 312s have a better specs and one may well do as better job but the 312 series are designed to work together.

The matching subs for those are the TS212S and they are £245 from G4M. They have a 30 day returns policy so it might be worth a punt on one/two.

Would not go for the Bose system. They can’t really cut it in a band situation and are designed for recorded music and voice, professional karaoke. By professional karaoke I mean those singers that just sing all night to backing tracks. I would go for a matching subwoofer, those Alto tips are not bad but with so much going through them they need help. Remember subs are not as directional as tops do you can use one (remember to run the system in mono).” The Subwoofer that goes with tops is the TS312 https://www.gear4music.com/PA-DJ-and-Lighting/Alto-TS312S-Active-Subwoofer/2YEB This will stop LF going to the tops and substantially increase the headroom. output from the mixer to the sub, then one feeed out from the subwoofer to rad of the TS 312s. Hopefully that will do the trick and they are £349 at G4M. You can add another later if need be. The diagram below is for the 15s but the wiring is the same.

Many of the well respected FOH sepakers are plastic boxes.

This is an ear opener. Both sit well ion the mix, but isolated are not too clever,. Is therehoepo for me yet ...nah