Chienmortbb

I ma amazed that it is almost 5 months since I posted and since then I have been playing through the amp every day. I have a few observations on tge amp and some mods that I will be doing. After some discussion with @Passinwind who designed the pre-amp, I will be modifying the treble control. Although I rarely boost treble and can cut it on the Tone pot of the bass, it seems odd to have a control that seems to do nothing. Secondly, I always needed to add an HPF as the speaker can only go so low and it is a waste of energy and headroom to let those frequencies through. The plan is for a fixed frequency 24dB/octave with a -3dB frequency of 50Hz. This may seem high but it has little effect on the real frequency response of the cab and means that at 100W, the cone excursion is well within the speakers capabilities down to a few Hz. Finally the power amp is capable of 100W into 8 ohms and 170 Watts into 4 ohms. It's just asking for an extension cabinet. So a Fane 8-225 speaker will be fitted into a matching box to utilise the whole power of the amp. So 2x8 stack fed with170 watts, ideal for my open mic gigs IF they start up again. Finally (for this post) a big thank for their help in this project you to @stevie, @Phil Starr and to @Passinwind

I had the GK and to me it ran out of power quite quickly in a band setting.

@stevie designed the BC112 MK3 with the horn rotated 90 degrees sothat the mids and highs could reach your ears while standing in front of the cab.

I have never liked valves but I love calves.

The one fail I have had on a gig is the failure of a Schaller straplock, I felt it go, caught it at about knee height, missed about a bar of the song and carried on with my foot on the cab with the bass on my knee. At the end of the song I got a round of applause.

Defibrillator sounds a good idea,

Ok so I usually don't and the thought of my pride and joy (Aerodyne Jazz) being stolen would break my hearts as I bought it with the money my Mum left me. My Peavey P bass (made In indonesia and bought for £50) has been gigged on many occasion when I working on the Aerodyne. \i suppose a doiuble gig bag would mean I could take both. I alos never take a second amp but do have an Orchid Classic DI.

I agree almost 100%. Most of the bass amps I have worked on use 1MR as the input impedance although that is probably higher than neccesary.

I do agree but Barefaced are the lightweight specialists. Their whole range is very light rather than most manufacturers who have a lightweight range almost as an afterthought. Incidently I don't own a Barefaced cab, I use @stevie's BC112 MK3 at 15Kg.

No there would be a vat charge and fee from the courier. £130 plus VAT plus courier charge.

Are not musical instruments zero duty?

Sorry for the delay. I will get it done this weekend.

You won’t go far wrong with Yamaha.

Altos are good mid range speakers and your singer's experience does prove the saying about a bad workman always blaming the tools, I firts tried the Wharfdale Titans at gig organised by @Phil StarrThey are 12s and Phil was aslo using subs. The format of the evening was that there were a number of musicians and singers and we all got to play a few songs in two different lineups. As a result we got the chance to listen to a range of voices when we were not playing. It was an excellent sound. The Titans main selling point is their lightweight, and the active ones have DSP so are slightly more versatile. Ther are mpre expensive that the PSX but only about £10.

I have a 25mm Q max cutter you can borrow if you decide to go the PowerCon route.

Although I am a Solid state amp man, I will follow with great interest.

Yes My band has used Mackie Thumps for this in the past and I think the PSX112s would be better. The Thumos they were more than adequate. However the Thumps use the TDA8954 Class D chip amp, theoretically capable of about 300Ws but in reality it needs a lot more cooling that the thumps are designed for to reach that figure, despite the fact that they have 1000W on the back. The PSX112 have a discrete(ish) amp designed around the IRS2092 chip but drives two powerful MOSFETs allowing more heat disppation. It is loosely based on the Infineon/IR Audamp7 reference design. With the higher voltage rails, this amp can get close to 400W altghough that would also depend on the power supply. However is does suggest that the design and quoted specs are conservative. In fact the same amp is used in the PSX15 with higher voltage rails to give a claimed 350W. Agains a quick calculation suggest that this is conservatively rated.

The crossover circuit diagram is a bit scruffy so I will tidy it up and put it on here later.

https://www.hificollective.co.uk/

Why a tube DI?

The PSX112 is very conservatively rated and unlike many so called quality brands has a discete Class D bass amp. while I think RCF excellent, te PSX112 is well made sounds good and certainly a cut above the EV and Mackie actives that use chip amps for their supposed 1000Ws. Wharfedale rate their products conservatively and at £228 a pair new the PSX112 are really good. They are being re-launched as Tourus soon and a bluetooth version and a (with illuminated logos) are being added to bring them in line with the rest of the range, They have handles on every side so are really easy to handle.

Blackstar Unity Bass Head Andertons £549 Thomann £599 inc vat. However I do agree that more items are cheaper even with the added VAT, 😮

In these days I think the rule should be that if you sing, you buy your own Mic.I use one of those foam shields too and wash it after every use. It is a health/hygiene matter and I would not trust anyone to make sure my mic is clean. Our band all have there own mics and another thing was to get a coloured cable.We did this by accident but it makes it easier to trace problems on stage.